What is the most common type of glass used in laboratories?
- Soda-glass
- Combustion-glass
- Lead-glass
- Resistance-glass
Correct Answer: Soda-glass
Correct Answer Explanation: Soda-glass was the most prevalent type of glass in 1921 laboratories due to its versatility, affordability, and ease of manipulation. Its primary constituent is sodium silicate, with lesser proportions of aluminum and potassium silicates.
What type of glass is known for its high heat resistance?
- Soda-glass
- Combustion-glass
- Lead-glass
- Resistance-glass
Correct Answer: Combustion-glass
Correct Answer Explanation: Combustion-glass, containing a higher proportion of calcium silicate and potassium silicate, exhibits superior heat resistance compared to soda-glass. It was frequently employed for applications requiring exposure to elevated temperatures.
Which glass type is famed for its brilliance and high refractive index?
- Soda-glass
- Combustion-glass
- Lead-glass
- Resistance-glass
Correct Answer: Lead-glass
Correct Answer Explanation: Lead-glass, often called “flint” glass, features a significant amount of lead silicate, granting it a notable brilliance and high refractive index. This makes it suitable for optical applications, like lenses and prisms.
What crucial process prevents glasswork from spontaneous cracking?
- Softening
- Annealing
- Devitrification
- Cutting
Correct Answer: Annealing
Correct Answer Explanation: Annealing is the process of carefully heating glass to just below its softening point and then gradually cooling it to relieve internal stresses. This crucial step significantly reduces the risk of spontaneous cracking in glassware, especially when dealing with thicker or more complex pieces.
What type of tool can be used to mark glass?
- Blowpipe
- Writing diamond
- Thermometer
- Annealing oven
Correct Answer: Writing diamond
Correct Answer Explanation: A writing diamond, a type of impure diamond, is traditionally employed for marking glass. Its sharp point can create durable marks on the surface, suitable for labeling or identifying glassware.
What is the ideal speed for spinning glass on a wheel to create fine threads?
- 50 revolutions per minute
- 100 revolutions per minute
- 300 revolutions per minute
- 500 revolutions per minute
Correct Answer: 300 revolutions per minute
Correct Answer Explanation: Spinning glass on a wheel at an ideal speed of 300 revolutions per minute facilitates the creation of fine threads. This precise speed provides sufficient centrifugal force for forming delicate glass fibers without compromising the integrity of the glass.
What is the ideal length of a blowpipe flame for most glass-blowing applications?
- 1-2 inches
- 3-6 inches
- 7-10 inches
- 11-14 inches
Correct Answer: 3-6 inches
Correct Answer Explanation: Maintaining a blowpipe flame within the range of 3-6 inches ensures optimal heat distribution and control during glass-blowing operations. This length allows for precise manipulation and prevents excessive heat from causing damage to the glass.
What is the typical size of a drilled hole in glass using a hard steel rod?
- 1/16 inch
- 1/8 inch
- 1/4 inch
- 1/2 inch
Correct Answer: 1/8 inch
Correct Answer Explanation: Drilling holes in glass with a hard steel rod typically results in a hole size of 1/8 inch. This size is suitable for various applications, while a larger hole might compromise the structural integrity of the glass piece.
How long should thicker glass articles be annealed in an oven?
- 1-2 hours
- 2-3 hours
- 3-4 hours
- 4-5 hours
Correct Answer: 2-3 hours
Correct Answer Explanation: Annealing thicker glass articles in an oven requires a longer duration to ensure even heat distribution and stress relief. A recommended annealing time for thicker glass pieces is 2-3 hours, which allows for adequate heat penetration and gradual cooling.
How long does it take for an annealing oven to cool after processing glass?
- 3-6 hours
- 3-12 hours
- 6-18 hours
- 12-24 hours
Correct Answer: 3-12 hours
Correct Answer Explanation: The cooling process after annealing glass in an oven can take between 3-12 hours, depending on the oven size and design. Gradual cooling is essential to prevent thermal shock and maintain the integrity of the annealed glass.
What is the ideal length of a flame produced by a blowpipe burning oil or wax?
- 3-6 inches
- 3-8 inches
- 4-10 inches
- 6-12 inches
Correct Answer: 3-8 inches
Correct Answer Explanation: A blowpipe using oil or wax as fuel produces a flame with a length of 3-8 inches. This flame provides the necessary heat for glass-blowing operations while maintaining a controlled and stable combustion.
What is the diameter of the glass bulb used in the valve of the mouth blowpipe with an expanding reservoir?
- 1/4 inch
- 3/8 inch
- 1/2 inch
- 5/8 inch
Correct Answer: 3/8 inch
Correct Answer Explanation: The valve of the mouth blowpipe, designed with an expanding reservoir, incorporates a glass bulb with a diameter of 3/8 inch. This size allows for adequate air storage and smooth air flow during blowing operations.
What is the diameter of the glass stem used in the valve of the mouth blowpipe with an expanding reservoir?
- 1/16 inch
- 1/8 inch
- 1/4 inch
- 3/8 inch
Correct Answer: 1/8 inch
Correct Answer Explanation: The valve of the mouth blowpipe with an expanding reservoir features a glass stem with a diameter of 1/8 inch. This size ensures a secure connection to the bulb while allowing for smooth air passage.
What is the length of the glass stem used in the valve of the mouth blowpipe with an expanding reservoir?
- 1 inch
- 1.5 inches
- 2 inches
- 2.5 inches
Correct Answer: 1.5 inches
Correct Answer Explanation: The glass stem used in the valve of the mouth blowpipe with an expanding reservoir typically has a length of 1.5 inches. This length allows for adequate connection to the bulb while maintaining a compact and manageable design.
What is the diameter of a simple tin tray used as a lamp for paraffin wax?
- 2 inches
- 3.5 inches
- 5 inches
- 6.5 inches
Correct Answer: 3.5 inches
Correct Answer Explanation: A basic tin tray, used as a lamp for paraffin wax, often has a diameter of 3.5 inches. This size provides sufficient space for the wax to melt and burn evenly, creating a consistent heat source for glass-blowing.
What is the depth of a simple tin tray used as a lamp for paraffin wax?
- 1/2 inch
- 3/4 inch
- 1 inch
- 1.5 inches
Correct Answer: 1 inch
Correct Answer Explanation: A simple tin tray serving as a paraffin wax lamp typically has a depth of 1 inch. This depth allows for adequate wax storage and prevents spillage while providing sufficient space for the flame to develop.
What is the amount of silver nitrate used in a silvering solution?
- 20 grammes
- 30 grammes
- 40 grammes
- 50 grammes
Correct Answer: 40 grammes
Correct Answer Explanation: A silvering solution for coating glass requires 40 grammes of silver nitrate. This component is crucial for the deposition of a silver mirror on the glass surface.
What is the amount of distilled water used in the silvering solution?
- 500 cubic centimeters
- 750 cubic centimeters
- 1000 cubic centimeters
- 1250 cubic centimeters
Correct Answer: 1000 cubic centimeters
Correct Answer Explanation: A silvering solution typically utilizes 1000 cubic centimeters of distilled water to dissolve the silver nitrate and other components, creating a stable and homogeneous solution.
What is the amount of ammonium nitrate used in a silvering solution?
- 40 grammes
- 50 grammes
- 60 grammes
- 70 grammes
Correct Answer: 60 grammes
Correct Answer Explanation: 60 grammes of ammonium nitrate is a standard component in a silvering solution. It acts as a reducing agent, facilitating the deposition of silver onto the glass surface.
What is the amount of caustic potash used in a silvering solution?
- 50 grammes
- 75 grammes
- 100 grammes
- 125 grammes
Correct Answer: 100 grammes
Correct Answer Explanation: The silvering solution requires 100 grammes of caustic potash. This component acts as an alkali, helping to create a favorable environment for the silver deposition process.
What is the amount of tartaric acid used in a silvering solution?
- 10 grammes
- 15 grammes
- 20 grammes
- 23 grammes
Correct Answer: 23 grammes
Correct Answer Explanation: A silvering solution typically uses 23 grammes of tartaric acid. This component acts as a stabilizer, preventing the premature reduction of silver ions and ensuring a smooth and even silver coating.
What is the amount of alcohol used in a silvering solution?
- 100 cubic centimeters
- 150 cubic centimeters
- 200 cubic centimeters
- 250 cubic centimeters
Correct Answer: 200 cubic centimeters
Correct Answer Explanation: The silvering solution requires 200 cubic centimeters of alcohol. This component acts as a solvent, helping to dissolve the other components and facilitate a smooth and uniform application of the silvering solution onto the glass surface.
What is the final volume of the silvering solution?
- 1500 cubic centimeters
- 1750 cubic centimeters
- 2000 cubic centimeters
- 2250 cubic centimeters
Correct Answer: 2000 cubic centimeters
Correct Answer Explanation: The final volume of the silvering solution, after combining all the components, is typically 2000 cubic centimeters. This volume provides an adequate amount of solution for silvering a reasonable area of glass.
What is the weight of 1 cubic centimeter of mercury at 15°C, used in calibrating burettes?
- 13.34 grammes
- 13.54 grammes
- 13.74 grammes
- 13.94 grammes
Correct Answer: 13.54 grammes
Correct Answer Explanation: Mercury, with a density of 13.54 grammes per cubic centimeter at 15°C, is traditionally used for calibrating burettes due to its stable weight and consistency. This allows for accurate determination of the volume delivered by the burette.
What is the process of determining the accurate volume of glassware used in volumetric measurements?
- Softening
- Annealing
- Devitrification
- Calibration
Correct Answer: Calibration
Correct Answer Explanation: Calibration is the essential process of determining the precise volume of glassware used for volumetric measurements. This ensures accurate dispensing and recording of liquid volumes in scientific experiments and analyses.
What is the name for the process where glass becomes more or less crystalline and infusible when heated?
- Softening
- Annealing
- Devitrification
- Calibration
Correct Answer: Devitrification
Correct Answer Explanation: Devitrification is a process where glass, when heated under certain conditions, transforms into a more crystalline and less fusible state. This change in structure alters the glass’s properties and can be undesirable in laboratory applications.
What is the name for a material that lowers the melting point of glass or metal, used in joining glass and metal?
- Flux
- Annealing
- Devitrification
- Calibration
Correct Answer: Flux
Correct Answer Explanation: A flux is a material that lowers the melting point of glass or metal, making it easier to fuse them together. It acts as a bonding agent, allowing for the creation of durable joints between dissimilar materials.
What is the name of a highly corrosive acid used for etching glass?
- Hydrofluoric Acid
- Sulfuric Acid
- Nitric Acid
- Acetic Acid
Correct Answer: Hydrofluoric Acid
Correct Answer Explanation: Hydrofluoric acid, a highly corrosive acid, is known for its ability to etch glass. It reacts with the silica in glass, creating a rough surface suitable for marking or creating designs.
What is the name for a type of impure diamond used in writing diamonds for marking glass?
- Bort
- Diamond Dust
- Carborundum
- Emery
Correct Answer: Bort
Correct Answer Explanation: Bort, a type of impure diamond, is frequently used in writing diamonds for marking glass due to its hardness and ability to create permanent marks on the glass surface.
What is the name for the essential process of carefully heating glass to just below its softening point and then gradually cooling it to relieve internal stresses?
- Softening
- Annealing
- Devitrification
- Calibration
Correct Answer: Annealing
Correct Answer Explanation: Annealing is a crucial process for glasswork, especially when creating thicker or more complex pieces. It involves carefully heating the glass to just below its softening point and then gradually cooling it to relieve internal stresses, reducing the risk of spontaneous cracking.
What is the name of the most common type of glass used in laboratories, made primarily of sodium silicate?
- Combustion-glass
- Lead-glass
- Resistance-glass
- Soda-glass
Correct Answer: Soda-glass
Correct Answer Explanation: Soda-glass, known for its versatility, affordability, and ease of manipulation, is the most widely used type of glass in laboratories. Its primary component is sodium silicate, with lesser amounts of aluminum and potassium silicates.
What is the name of a glass type that is less fusible than soda-glass, containing more calcium silicate and potassium silicate, and suitable for high heat applications?
- Combustion-glass
- Lead-glass
- Resistance-glass
- Soda-glass
Correct Answer: Combustion-glass
Correct Answer Explanation: Combustion-glass, with its higher content of calcium silicate and potassium silicate, exhibits greater heat resistance than soda-glass. It is frequently employed for applications requiring exposure to elevated temperatures.
What is the name of a glass type that is also known as “flint” glass, contains a significant amount of lead silicate, and is known for its brilliance and stability?
- Combustion-glass
- Lead-glass
- Resistance-glass
- Soda-glass
Correct Answer: Lead-glass
Correct Answer Explanation: Lead-glass, also known as “flint” glass, features a significant amount of lead silicate, granting it a notable brilliance and high refractive index. This makes it suitable for optical applications, like lenses and prisms.
What is the name of a glass type that is designed to have minimal solubility in water and other solutions, and is used when traces of alkali or silicates could affect experiments?
- Combustion-glass
- Lead-glass
- Resistance-glass
- Soda-glass
Correct Answer: Resistance-glass
Correct Answer Explanation: Resistance-glass is specifically designed to minimize solubility in water and other solutions. It is essential when traces of alkali or silicates could potentially interfere with scientific experiments and analysis.
What is the name of a glass-blowing technique that involves carefully heating the end of a sealed tube, removing it from the flame, and then cautiously blowing while rotating the tube to create a bulb?
- Blowing a bulb on a tube
- Joining tubes end-to-end
- Joining a small tube to a large one
- Making a T-piece
Correct Answer: Blowing a bulb on a tube
Correct Answer Explanation: Blowing a bulb on a tube is a fundamental glass-blowing technique. It involves heating the end of a sealed tube, removing it from the flame, and then carefully blowing while rotating the tube to create a bulb of desired size and shape.
What is the name of a glass-blowing technique that involves heating both ends of two tubes of similar glass to softening, bringing them together, and then cautiously blowing to expand the join?
- Blowing a bulb on a tube
- Joining tubes end-to-end
- Joining a small tube to a large one
- Making a T-piece
Correct Answer: Joining tubes end-to-end
Correct Answer Explanation: Joining tubes end-to-end is a common glass-blowing technique. It involves heating both ends of two tubes of similar glass to softening, bringing them together, and then carefully blowing to expand the join, creating a seamless connection.
What is the name of a glass-blowing technique that involves first expanding the end of the larger tube, then carefully joining the small tube to the expanded area using controlled heat and blowing?
- Blowing a bulb on a tube
- Joining tubes end-to-end
- Joining a small tube to a large one
- Making a T-piece
Correct Answer: Joining a small tube to a large one
Correct Answer Explanation: Joining a small tube to a larger one is a skilled glass-blowing technique that requires careful manipulation of heat and pressure. It involves expanding the end of the larger tube, then gently joining the smaller tube to the expanded area, ensuring a smooth and secure connection.
What is the name of a glass-blowing technique that involves joining a smaller tube to the end of a larger tube, creating a branched connection, where the process involves carefully expanding the larger tube before joining and then using controlled heat and blowing to shape the “T”?
- Blowing a bulb on a tube
- Joining tubes end-to-end
- Joining a small tube to a large one
- Making a T-piece
Correct Answer: Making a T-piece
Correct Answer Explanation: Making a T-piece is a fundamental glass-blowing technique for creating branched connections. It involves joining a smaller tube to the end of a larger tube, creating a T-shaped structure. The process requires careful expansion of the larger tube before joining and then controlled heat and blowing to shape the T-piece.
What is the name of a type of branch that is used to connect a tube to a vacuum pump, made by fusing a small piece of glass rod to the tube, blowing it out, and then carefully drawing the rod away while maintaining air pressure?
- Exhaustion Branch
- Spray Arrester
- Soxhlet-Tube
- Electrode Seal
Correct Answer: Exhaustion Branch
Correct Answer Explanation: An exhaustion branch is a specialized type of branch used to connect a tube to a vacuum pump. It is made by fusing a small piece of glass rod to the tube, blowing it out, and then carefully drawing the rod away while maintaining air pressure, creating a robust connection.
What is the name of a glass-blowing apparatus for extracting substances that involves creating a re-entrant join where the syphon flows into a lower tube, requiring careful expansion of the ends of the syphon tube and the lower tube before fusing them together?
- Exhaustion Branch
- Spray Arrester
- Soxhlet-Tube
- Electrode Seal
Correct Answer: Soxhlet-Tube
Correct Answer Explanation: A Soxhlet-tube is a specialized glass-blowing apparatus designed for extracting substances. It involves creating a re-entrant join where the syphon flows into a lower tube, requiring careful expansion of the ends of the syphon tube and the lower tube before fusing them together.
What is the name of a glass-blowing technique that involves carefully heating the end of a thin-walled capillary tube and expanding the heated glass into a bulb while maintaining slight internal air pressure?
- Thermometer Bulb
- Spray Arrester
- Soxhlet-Tube
- Electrode Seal
Correct Answer: Thermometer Bulb
Correct Answer Explanation: A thermometer bulb is created using a specific glass-blowing technique. It involves carefully heating the end of a thin-walled capillary tube and expanding the heated glass into a bulb while maintaining slight internal air pressure. The bulb acts as the temperature-sensing element in a thermometer.
What is the name of a glass-blowing technique that involves first fusing a small tube inside a bulb, then perforating the bulb and joining on the outer tube?
- Thermometer Bulb
- Spray Arrester
- Soxhlet-Tube
- Electrode Seal
Correct Answer: Spray Arrester
Correct Answer Explanation: A spray arrester is a glass-blowing device designed to prevent droplets from being carried by a gas stream. It is constructed by first fusing a small tube inside a bulb, then perforating the bulb and joining on the outer tube. The perforations allow the gas to pass while trapping any droplets.
What is the name of a glass-blowing technique that involves sealing a platinum wire into a glass tube by heating the tube until the soft glass flows around the wire, creating a secure and air-tight seal?
- Thermometer Bulb
- Spray Arrester
- Soxhlet-Tube
- Electrode Seal
Correct Answer: Electrode Seal
Correct Answer Explanation: An electrode seal is a specialized glass-blowing technique used to securely attach a platinum wire to a glass tube. It involves heating the glass tube until it softens, allowing the glass to flow around the platinum wire, creating a secure and air-tight seal for electrical applications.
What is the name of a type of fuel for glass-blowing that is convenient but less ideal due to its high flammability and lower heat output?
- Alcohol
- Paraffin Wax
- Animal Oil
- Vegetable Oil
Correct Answer: Alcohol
Correct Answer Explanation: Alcohol, while convenient as a fuel for glass-blowing, is less ideal due to its high flammability and lower heat output. Its volatility makes it more challenging to control the flame, and its lower heat production may not be sufficient for certain glass-blowing operations.
What is the name of a type of fuel for glass-blowing that is effective, portable, and safe, where special lamps are designed to accommodate this type of fuel, allowing for precise flame control?
- Alcohol
- Paraffin Wax
- Animal Oil
- Vegetable Oil
Correct Answer: Paraffin Wax
Correct Answer Explanation: Paraffin wax, a solid fuel, is effective, portable, and safe for glass-blowing. Special lamps are designed to accommodate this type of fuel, allowing for precise flame control and a consistent heat source for glass-blowing operations.
What is the name of a type of fuel for glass-blowing that can be used but may become hard and gummy over time, and also tend to produce smoke, which may be undesirable in some settings?
- Alcohol
- Paraffin Wax
- Animal Oil
- Vegetable Oil
Correct Answer: Animal Oil
Correct Answer Explanation: Animal oils, while suitable for glass-blowing, may become hard and gummy over time, requiring frequent cleaning of the blowpipe. They also tend to produce smoke, which may be undesirable in some settings, making them less preferred compared to other fuels.
What is the name of a type of fuel for glass-blowing that can be used but may become hard and gummy over time, and also tend to produce smoke, which may be undesirable in some settings?
- Alcohol
- Paraffin Wax
- Animal Oil
- Vegetable Oil
Correct Answer: Vegetable Oil
Correct Answer Explanation: Vegetable oils, like animal oils, can be used for glass-blowing but may become hard and gummy over time, requiring frequent cleaning of the blowpipe. They also tend to produce smoke, which may be undesirable in some settings.
What is the name for the process of shaping a glass tube and then grinding a plug to fit the socket to create a stopcock?
- Joining tubes end-to-end
- Making a T-piece
- Blowing a bulb on a tube
- Creating a stopcock
Correct Answer: Creating a stopcock
Correct Answer Explanation: Creating a stopcock involves shaping a glass tube and then grinding a plug to fit the socket. This process involves heating the tube, creating raised rings, and then drawing out extensions to form the stopcock, allowing for precise control of liquid flow.
What is the name of the most common type of glass used in laboratories, made primarily of sodium silicate?
- Combustion-glass
- Lead-glass
- Resistance-glass
- Soda-glass
Correct Answer: Soda-glass
Correct Answer Explanation: Soda-glass, known for its versatility, affordability, and ease of manipulation, is the most widely used type of glass in laboratories. Its primary component is sodium silicate, with lesser amounts of aluminum and potassium silicates.
What is the name of a glass type that is less fusible than soda-glass, containing more calcium silicate and potassium silicate, and suitable for high heat applications?
- Combustion-glass
- Lead-glass
- Resistance-glass
- Soda-glass
Correct Answer: Combustion-glass
Correct Answer Explanation: Combustion-glass, with its higher content of calcium silicate and potassium silicate, exhibits greater heat resistance than soda-glass. It is frequently employed for applications requiring exposure to elevated temperatures.
What is the name of a glass type that is also known as “flint” glass, contains a significant amount of lead silicate, and is known for its brilliance and stability?
- Combustion-glass
- Lead-glass
- Resistance-glass
- Soda-glass
Correct Answer: Lead-glass
Correct Answer Explanation: Lead-glass, also known as “flint” glass, features a significant amount of lead silicate, granting it a notable brilliance and high refractive index. This makes it suitable for optical applications, like lenses and prisms.
What is the name of a glass type that is designed to have minimal solubility in water and other solutions, and is used when traces of alkali or silicates could affect experiments?
- Combustion-glass
- Lead-glass
- Resistance-glass
- Soda-glass
Correct Answer: Resistance-glass
Correct Answer Explanation: Resistance-glass is specifically designed to minimize solubility in water and other solutions. It is essential when traces of alkali or silicates could potentially interfere with scientific experiments and analysis.
What is the name of a glass-blowing technique that involves carefully heating the end of a sealed tube, removing it from the flame, and then cautiously blowing while rotating the tube to create a bulb?
- Blowing a bulb on a tube
- Joining tubes end-to-end
- Joining a small tube to a large one
- Making a T-piece
Correct Answer: Blowing a bulb on a tube
Correct Answer Explanation: Blowing a bulb on a tube is a fundamental glass-blowing technique. It involves heating the end of a sealed tube, removing it from the flame, and then carefully blowing while rotating the tube to create a bulb of desired size and shape.
What is the name of a glass-blowing technique that involves heating both ends of two tubes of similar glass to softening, bringing them together, and then cautiously blowing to expand the join?
- Blowing a bulb on a tube
- Joining tubes end-to-end
- Joining a small tube to a large one
- Making a T-piece
Correct Answer: Joining tubes end-to-end
Correct Answer Explanation: Joining tubes end-to-end is a common glass-blowing technique. It involves heating both ends of two tubes of similar glass to softening, bringing them together, and then carefully blowing to expand the join, creating a seamless connection.
What is the name of a glass-blowing technique that involves first expanding the end of the larger tube, then carefully joining the small tube to the expanded area using controlled heat and blowing?
- Blowing a bulb on a tube
- Joining tubes end-to-end
- Joining a small tube to a large one
- Making a T-piece
Correct Answer: Joining a small tube to a large one
Correct Answer Explanation: Joining a small tube to a larger one is a skilled glass-blowing technique that requires careful manipulation of heat and pressure. It involves expanding the end of the larger tube, then gently joining the smaller tube to the expanded area, ensuring a smooth and secure connection.
What is the name of a glass-blowing technique that involves joining a smaller tube to the end of a larger tube, creating a branched connection, where the process involves carefully expanding the larger tube before joining and then using controlled heat and blowing to shape the “T”?
- Blowing a bulb on a tube
- Joining tubes end-to-end
- Joining a small tube to a large one
- Making a T-piece
Correct Answer: Making a T-piece
Correct Answer Explanation: Making a T-piece is a fundamental glass-blowing technique for creating branched connections. It involves joining a smaller tube to the end of a larger tube, creating a T-shaped structure. The process requires careful expansion of the larger tube before joining and then controlled heat and blowing to shape the T-piece.
What is the name of a type of branch that is used to connect a tube to a vacuum pump, made by fusing a small piece of glass rod to the tube, blowing it out, and then carefully drawing the rod away while maintaining air pressure?
- Exhaustion Branch
- Spray Arrester
- Soxhlet-Tube
- Electrode Seal
Correct Answer: Exhaustion Branch
Correct Answer Explanation: An exhaustion branch is a specialized type of branch used to connect a tube to a vacuum pump. It is made by fusing a small piece of glass rod to the tube, blowing it out, and then carefully drawing the rod away while maintaining air pressure, creating a robust connection.
What is the name of a glass-blowing apparatus for extracting substances that involves creating a re-entrant join where the syphon flows into a lower tube, requiring careful expansion of the ends of the syphon tube and the lower tube before fusing them together?
- Exhaustion Branch
- Spray Arrester
- Soxhlet-Tube
- Electrode Seal
Correct Answer: Soxhlet-Tube
Correct Answer Explanation: A Soxhlet-tube is a specialized glass-blowing apparatus designed for extracting substances. It involves creating a re-entrant join where the syphon flows into a lower tube, requiring careful expansion of the ends of the syphon tube and the lower tube before fusing them together.
What is the name of a glass-blowing technique that involves carefully heating the end of a thin-walled capillary tube and expanding the heated glass into a bulb while maintaining slight internal air pressure?
- Thermometer Bulb
- Spray Arrester
- Soxhlet-Tube
- Electrode Seal
Correct Answer: Thermometer Bulb
Correct Answer Explanation: A thermometer bulb is created using a specific glass-blowing technique. It involves carefully heating the end of a thin-walled capillary tube and expanding the heated glass into a bulb while maintaining slight internal air pressure. The bulb acts as the temperature-sensing element in a thermometer.
What is the name of a glass-blowing technique that involves first fusing a small tube inside a bulb, then perforating the bulb and joining on the outer tube?
- Thermometer Bulb
- Spray Arrester
- Soxhlet-Tube
- Electrode Seal
Correct Answer: Spray Arrester
Correct Answer Explanation: A spray arrester is a glass-blowing device designed to prevent droplets from being carried by a gas stream. It is constructed by first fusing a small tube inside a bulb, then perforating the bulb and joining on the outer tube. The perforations allow the gas to pass while trapping any droplets.
What is the name of a glass-blowing technique that involves sealing a platinum wire into a glass tube by heating the tube until the soft glass flows around the wire, creating a secure and air-tight seal?
- Thermometer Bulb
- Spray Arrester
- Soxhlet-Tube
- Electrode Seal
Correct Answer: Electrode Seal
Correct Answer Explanation: An electrode seal is a specialized glass-blowing technique used to securely attach a platinum wire to a glass tube. It involves heating the glass tube until it softens, allowing the glass to flow around the platinum wire, creating a secure and air-tight seal for electrical applications.
What is the name of a type of fuel for glass-blowing that is convenient but less ideal due to its high flammability and lower heat output?
- Alcohol
- Paraffin Wax
- Animal Oil
- Vegetable Oil
Correct Answer: Alcohol
Correct Answer Explanation: Alcohol, while convenient as a fuel for glass-blowing, is less ideal due to its high flammability and lower heat output. Its volatility makes it more challenging to control the flame, and its lower heat production may not be sufficient for certain glass-blowing operations.
What is the name of a type of fuel for glass-blowing that is effective, portable, and safe, where special lamps are designed to accommodate this type of fuel, allowing for precise flame control?
- Alcohol
- Paraffin Wax
- Animal Oil
- Vegetable Oil
Correct Answer: Paraffin Wax
Correct Answer Explanation: Paraffin wax, a solid fuel, is effective, portable, and safe for glass-blowing. Special lamps are designed to accommodate this type of fuel, allowing for precise flame control and a consistent heat source for glass-blowing operations.
What is the name of a type of fuel for glass-blowing that can be used but may become hard and gummy over time, and also tend to produce smoke, which may be undesirable in some settings?
- Alcohol
- Paraffin Wax
- Animal Oil
- Vegetable Oil
Correct Answer: Animal Oil
Correct Answer Explanation: Animal oils, while suitable for glass-blowing, may become hard and gummy over time, requiring frequent cleaning of the blowpipe. They also tend to produce smoke, which may be undesirable in some settings, making them less preferred compared to other fuels.
What is the name of a type of fuel for glass-blowing that can be used but may become hard and gummy over time, and also tend to produce smoke, which may be undesirable in some settings?
- Alcohol
- Paraffin Wax
- Animal Oil
- Vegetable Oil
Correct Answer: Vegetable Oil
Correct Answer Explanation: Vegetable oils, like animal oils, can be used for glass-blowing but may become hard and gummy over time, requiring frequent cleaning of the blowpipe. They also tend to produce smoke, which may be undesirable in some settings.
What is the name for the process of shaping a glass tube and then grinding a plug to fit the socket to create a stopcock?
- Joining tubes end-to-end
- Making a T-piece
- Blowing a bulb on a tube
- Creating a stopcock
Correct Answer: Creating a stopcock
Correct Answer Explanation: Creating a stopcock involves shaping a glass tube and then grinding a plug to fit the socket. This process involves heating the tube, creating raised rings, and then drawing out extensions to form the stopcock, allowing for precise control of liquid flow.
What is the name of the process where glass becomes more or less crystalline and infusible when heated?
- Softening
- Annealing
- Devitrification
- Calibration
Correct Answer: Devitrification
Correct Answer Explanation: Devitrification is a process where glass, when heated under certain conditions, transforms into a more crystalline and less fusible state. This change in structure alters the glass’s properties and can be undesirable in laboratory applications.
What is the name for a material that lowers the melting point of glass or metal, used in joining glass and metal?
- Flux
- Annealing
- Devitrification
- Calibration
Correct Answer: Flux
Correct Answer Explanation: A flux is a material that lowers the melting point of glass or metal, making it easier to fuse them together. It acts as a bonding agent, allowing for the creation of durable joints between dissimilar materials.
What is the name of a highly corrosive acid used for etching glass?
- Hydrofluoric Acid
- Sulfuric Acid
- Nitric Acid
- Acetic Acid
Correct Answer: Hydrofluoric Acid
Correct Answer Explanation: Hydrofluoric acid, a highly corrosive acid, is known for its ability to etch glass. It reacts with the silica in glass, creating a rough surface suitable for marking or creating designs.
What is the name for a type of impure diamond used in writing diamonds for marking glass?
- Bort
- Diamond Dust
- Carborundum
- Emery
Correct Answer: Bort
Correct Answer Explanation: Bort, a type of impure diamond, is frequently used in writing diamonds for marking glass due to its hardness and ability to create permanent marks on the glass surface.