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Laboratory

Laboratory
452問 • 9ヶ月前
  • Liane
    • 通報

    問題一覧

  • 1

    Which type of electronic balance is typically used for chemical analysis in laboratories due to its high sensitivity?

    Analytical Balance

  • 2

    What is the typical precision of a Moisture Balance?

    0.001 g or better

  • 3

    Name two features of a Portable Balance.

    Battery-powered, Easy to carry

  • 4

    Which type of balance would you expect to be used in schools for general-purpose weighing?

    Compact Balance

  • 5

    For quick checks in the field, which type of balance is most appropriate?

    Portable Balance

  • 6

    What feature distinguishes Analytical Balances from other types?

    Enclosed draft shield

  • 7

    In which application is a Moisture Balance especially useful?

    Food, pharma, materials moisture testing

  • 8

    Which balance type is described as cost-effective with a simple interface but less sensitivity?

    Compact Balance

  • 9

    If an experiment requires a precision of 0.0001 g, which balance should be chosen?

    Analytical Balance

  • 10

    Name a key difference between Precision Balances and Analytical Balances.

    Precision Balances generally have lower sensitivity than Analytical Balances

  • 11

    What is the typical precision of a standard analytical balance?

    0.0001 g (0.1 mg)

  • 12

    Which type of analytical balance is designed for ultra-precise research such as in pharmaceuticals?

    Microbalance

  • 13

    What feature is common to all analytical balances to ensure result accuracy?

    Draft shield

  • 14

    Which balance is more sensitive than the standard analytical balance and used when finer resolution is needed?

    Semi-Micro Balance

  • 15

    Which type of balance is best for weighing larger sample masses while maintaining analytical precision?

    High-Capacity Analytical Balance

  • 16

    What is the typical precision of a microbalance?

    0.000001 g (1 μg)

  • 17

    For general laboratory weighing tasks, which balance is most commonly used?

    Standard Analytical Balance

  • 18

    Which balance automatically adjusts its precision based on sample weight?

    Dual Range Balance

  • 19

    Which balance would you select for high-precision lab work requiring a 0.00001 g (0.01 mg) resolution?

    Semi-Micro Balance

  • 20

    Name the analytical balance type characterized by a dual range, such as 0.1 mg and 0.01 mg.

    Dual Range Balance

  • 21

    What is a key application of microbalances?

    Ultra-precise research (e.g., pharmaceuticals)

  • 22

    Which type of balance is used when extremely sensitive measurements are required in controlled environments?

    Microbalance

  • 23

    A laboratory requires precise weighing but with the ability to handle mixed sample sizes. Which balance type is suitable?

    Dual Range Balance

  • 24

    What is the main advantage of a high-capacity analytical balance?

    Higher weighing capacity with maintained precision

  • 25

    Which balance would NOT be ideal for ultra-precise pharmaceutical research?

    Standard Analytical Balance

  • 26

    What is the purpose of using the tare function on a balance when weighing chemicals?

    To reset the displayed mass to zero with the empty vessel in place

  • 27

    What should you never do when weighing chemicals on a balance?

    Place chemicals directly on the balance pan

  • 28

    Why is it important not to spill chemicals into the balance mechanism?

    It can damage the balance and cause corrosion

  • 29

    What is the mass of the empty vessel on a balance called?

    Tare

  • 30

    What is the preferred weighing method for hygroscopic substances?

    Weighing by difference

  • 31

    How do you determine the amount of hygroscopic reagent used in weighing by difference?

    By subtracting the mass of the container after reagent transfer from its original mass

  • 32

    If a balance lacks a tare function, what must be done to find the mass of the chemical?

    Subtract the mass of the empty vessel from the total mass

  • 33

    Which of the following is an appropriate vessel for weighing chemicals?

    Weighing vial, Weighing dish, Weighing paper

  • 34

    Why should chemicals not be placed directly on the balance pan?

    To prevent damage and corrosion of the balance

  • 35

    What should be done if a substance absorbs moisture from the air during weighing?

    Use weighing by difference to minimize exposure

  • 36

    Why must samples be at room temperature before weighing?

    To prevent air currents that distort readings, To ensure accurate measurement unaffected by temperature differences

  • 37

    What effect does a warm item have when placed on a balance?

    It may appear lighter than its actual mass

  • 38

    How should oven-dried samples be handled before weighing to prevent moisture absorption?

    Cool them in a desiccator for about 30 minutes

  • 39

    Why should items be placed at the center of the balance pan?

    To ensure accurate readings

  • 40

    What precaution should be taken with magnetic samples during weighing?

    Be cautious as they can cause fluctuating readings

  • 41

    Which tool should be used to handle samples to prevent mass changes from fingerprints or body heat?

    Tweezers or tissues

  • 42

    What is linearity error in a balance?

    A slight deviation across the balance's range even after calibration

  • 43

    How do analytical balances typically self-calibrate?

    By using an internal mass

  • 44

    When verifying a balance with standard weights, which aspect should be checked?

    That readings are within tolerance

  • 45

    What is the purpose of a reproducibility test for balances?

    To weigh a standard mass multiple times and calculate the standard deviation

  • 46

    Which laboratory apparatus is used to accurately deliver a specific volume of liquid during titration?

    Buret

  • 47

    Where is the 0 mL mark located on a buret?

    At the top

  • 48

    What is the tolerance for a Class A 50 mL buret according to Harris (2011)?

    ±0.05 mL

  • 49

    Which device is designed to measure volume as precisely as mass is measured in analytical methods?

    Pipettes, burets, and volumetric flasks

  • 50

    Class A burets are considered the most accurate. What defines their accuracy?

    Strict tolerance standards, e.g., ±0.05 mL for a 50 mL buret

  • 51

    Which of the following is NOT a type of buret mentioned in the text?

    Automatic color buret

  • 52

    How does a buret release liquid for measurement?

    Through a stopcock

  • 53

    What is the smallest graduation for a 10 mL Class A buret?

    0.05 or 0.02 mL

  • 54

    What must manufacturers specify when calibrating pipettes, burets, and volumetric flasks?

    The specific temperature for calibration

  • 55

    Why is precise volume measurement important in analytical methods?

    To ensure accuracy and reliability of results

  • 56

    Which of the following best describes the use of a buret in titration?

    Delivers titrant accurately to determine the endpoint

  • 57

    At what temperature are burets typically calibrated by the manufacturer?

    A specific temperature noted by the manufacturer

  • 58

    What is the tolerance for a 5 mL Class A buret?

    ±0.01 mL

  • 59

    Which item is NOT listed as a device for reliable volume measurement?

    Test tube

  • 60

    Which type of buret provides the strictest accuracy according to the text?

    Class A buret

  • 61

    What is the primary function of the stopcock in a buret?

    Controls the flow of liquid dispensed

  • 62

    What is the main function of a volumetric buret?

    To control liquid flow during titrations

  • 63

    Which feature is common to both traditional volumetric and digital burets?

    A mechanism to control liquid dispensing

  • 64

    How is the liquid volume typically read on a traditional buret?

    From the printed volume scale on the side of the tube

  • 65

    What is the purpose of the stopcock on a buret?

    To regulate the liquid flow out of the buret

  • 66

    Which type of buret is designed especially for use with corrosive alkalis?

    Digital or piston buret made with resistant plastics

  • 67

    What does a gas buret measure?

    The volume of gas

  • 68

    How does a gas buret determine the volume of the gas?

    By measuring displacement of liquid (e.g., water or mercury)

  • 69

    Which buret type features a digital display for delivered volume?

    Piston buret and electronic buret

  • 70

    How is an electronic buret different from other burets?

    It automates dispensing and minimizes human error

  • 71

    Which of the following is NOT a use for a traditional liquid buret?

    Measuring gas pressure

  • 72

    What mechanism allows a digital or piston buret to dispense liquid?

    A plunger mechanism

  • 73

    What advances does an electronic buret offer compared to manual types?

    Electronic volume control and display for high precision

  • 74

    Why might plastics be used in constructing digital burets?

    They resist corrosion from chemicals like alkalis

  • 75

    Where is the stopcock located on a traditional liquid buret?

    At the bottom of the buret

  • 76

    What is the primary role of burets in laboratory titrations?

    Delivering measured liquid volumes accurately

  • 77

    What should you rinse the buret with before starting a titration to ensure accuracy?

    The solution to be used in the titration

  • 78

    Why is it important to check and eliminate air bubbles in the buret during titration?

    Air bubbles can cause inaccurate volume readings

  • 79

    From where should you take readings in a buret to avoid parallax error?

    The bottom of the curved meniscus

  • 80

    What is the recommended way to deliver titrant as you approach the endpoint of a titration?

    Deliver dropwise

  • 81

    To what precision should buret readings be estimated during titration?

    To the nearest 0.01 mL

  • 82

    Why do you need to account for the graduation line thickness when reading a buret?

    To improve the accuracy of the volume measurement

  • 83

    How should you fill and drain a buret for titration?

    Carefully

  • 84

    What might happen if you do not fill and drain the buret carefully before titration?

    The volume delivered may be inaccurate

  • 85

    What is the primary reason for draining the liquid slowly and steadily from a buret?

    To ensure precise measurement of the volume delivered

  • 86

    What could cause parallax error when reading a buret?

    Taking readings from above or below the true level of the meniscus

  • 87

    Which type of pipette is designed for transferring a single fixed volume, typically with high precision?

    Volumetric pipette

  • 88

    What is the typical volume range for a micropipette as described in the table?

    0.1-1000 uL (μL)

  • 89

    Which pipette type uses a digital or dial setting to adjust volume?

    Micropipette

  • 90

    Which pipette has graduations that extend all the way to the tip?

    Graduated: Serological pipette

  • 91

    What marks a 'blow-out' pipette, according to the table?

    A frosted band or two thin rings

  • 92

    Which pipette does NOT have 'blow-out' function?

    Volumetric pipette, Graduated: Mohr pipette, Micropipette

  • 93

    What kind of graduation does a volumetric pipette have?

    Single calibration mark

  • 94

    For maximum flexibility in measuring different volumes, which pipette would you use?

    Micropipette, Graduated: Serological pipette, Graduated: Mohr pipette

  • 95

    If you need to accurately transfer 10 mL of a solution, which pipette type is specifically designed for this?

    Volumetric pipette (10 mL fixed volume)

  • 96

    Which pipette type is best for high precision tasks?

    Volumetric pipette

  • 97

    Graduated: Mohr pipettes are characterized by what kind of graduations?

    Graduations stop above tip

  • 98

    Which pipette is marked with a 'blow-out' indicator?

    Graduated: Serological pipette

  • 99

    Which pipette typically does NOT use a digital or dial setting?

    Volumetric pipette, Graduated: Mohr pipette, Graduated: Serological pipette

  • 100

    For which pipette type is knowing where the graduations stop important for accurate volume measurement?

    Graduated: Mohr pipette

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    問題一覧

  • 1

    Which type of electronic balance is typically used for chemical analysis in laboratories due to its high sensitivity?

    Analytical Balance

  • 2

    What is the typical precision of a Moisture Balance?

    0.001 g or better

  • 3

    Name two features of a Portable Balance.

    Battery-powered, Easy to carry

  • 4

    Which type of balance would you expect to be used in schools for general-purpose weighing?

    Compact Balance

  • 5

    For quick checks in the field, which type of balance is most appropriate?

    Portable Balance

  • 6

    What feature distinguishes Analytical Balances from other types?

    Enclosed draft shield

  • 7

    In which application is a Moisture Balance especially useful?

    Food, pharma, materials moisture testing

  • 8

    Which balance type is described as cost-effective with a simple interface but less sensitivity?

    Compact Balance

  • 9

    If an experiment requires a precision of 0.0001 g, which balance should be chosen?

    Analytical Balance

  • 10

    Name a key difference between Precision Balances and Analytical Balances.

    Precision Balances generally have lower sensitivity than Analytical Balances

  • 11

    What is the typical precision of a standard analytical balance?

    0.0001 g (0.1 mg)

  • 12

    Which type of analytical balance is designed for ultra-precise research such as in pharmaceuticals?

    Microbalance

  • 13

    What feature is common to all analytical balances to ensure result accuracy?

    Draft shield

  • 14

    Which balance is more sensitive than the standard analytical balance and used when finer resolution is needed?

    Semi-Micro Balance

  • 15

    Which type of balance is best for weighing larger sample masses while maintaining analytical precision?

    High-Capacity Analytical Balance

  • 16

    What is the typical precision of a microbalance?

    0.000001 g (1 μg)

  • 17

    For general laboratory weighing tasks, which balance is most commonly used?

    Standard Analytical Balance

  • 18

    Which balance automatically adjusts its precision based on sample weight?

    Dual Range Balance

  • 19

    Which balance would you select for high-precision lab work requiring a 0.00001 g (0.01 mg) resolution?

    Semi-Micro Balance

  • 20

    Name the analytical balance type characterized by a dual range, such as 0.1 mg and 0.01 mg.

    Dual Range Balance

  • 21

    What is a key application of microbalances?

    Ultra-precise research (e.g., pharmaceuticals)

  • 22

    Which type of balance is used when extremely sensitive measurements are required in controlled environments?

    Microbalance

  • 23

    A laboratory requires precise weighing but with the ability to handle mixed sample sizes. Which balance type is suitable?

    Dual Range Balance

  • 24

    What is the main advantage of a high-capacity analytical balance?

    Higher weighing capacity with maintained precision

  • 25

    Which balance would NOT be ideal for ultra-precise pharmaceutical research?

    Standard Analytical Balance

  • 26

    What is the purpose of using the tare function on a balance when weighing chemicals?

    To reset the displayed mass to zero with the empty vessel in place

  • 27

    What should you never do when weighing chemicals on a balance?

    Place chemicals directly on the balance pan

  • 28

    Why is it important not to spill chemicals into the balance mechanism?

    It can damage the balance and cause corrosion

  • 29

    What is the mass of the empty vessel on a balance called?

    Tare

  • 30

    What is the preferred weighing method for hygroscopic substances?

    Weighing by difference

  • 31

    How do you determine the amount of hygroscopic reagent used in weighing by difference?

    By subtracting the mass of the container after reagent transfer from its original mass

  • 32

    If a balance lacks a tare function, what must be done to find the mass of the chemical?

    Subtract the mass of the empty vessel from the total mass

  • 33

    Which of the following is an appropriate vessel for weighing chemicals?

    Weighing vial, Weighing dish, Weighing paper

  • 34

    Why should chemicals not be placed directly on the balance pan?

    To prevent damage and corrosion of the balance

  • 35

    What should be done if a substance absorbs moisture from the air during weighing?

    Use weighing by difference to minimize exposure

  • 36

    Why must samples be at room temperature before weighing?

    To prevent air currents that distort readings, To ensure accurate measurement unaffected by temperature differences

  • 37

    What effect does a warm item have when placed on a balance?

    It may appear lighter than its actual mass

  • 38

    How should oven-dried samples be handled before weighing to prevent moisture absorption?

    Cool them in a desiccator for about 30 minutes

  • 39

    Why should items be placed at the center of the balance pan?

    To ensure accurate readings

  • 40

    What precaution should be taken with magnetic samples during weighing?

    Be cautious as they can cause fluctuating readings

  • 41

    Which tool should be used to handle samples to prevent mass changes from fingerprints or body heat?

    Tweezers or tissues

  • 42

    What is linearity error in a balance?

    A slight deviation across the balance's range even after calibration

  • 43

    How do analytical balances typically self-calibrate?

    By using an internal mass

  • 44

    When verifying a balance with standard weights, which aspect should be checked?

    That readings are within tolerance

  • 45

    What is the purpose of a reproducibility test for balances?

    To weigh a standard mass multiple times and calculate the standard deviation

  • 46

    Which laboratory apparatus is used to accurately deliver a specific volume of liquid during titration?

    Buret

  • 47

    Where is the 0 mL mark located on a buret?

    At the top

  • 48

    What is the tolerance for a Class A 50 mL buret according to Harris (2011)?

    ±0.05 mL

  • 49

    Which device is designed to measure volume as precisely as mass is measured in analytical methods?

    Pipettes, burets, and volumetric flasks

  • 50

    Class A burets are considered the most accurate. What defines their accuracy?

    Strict tolerance standards, e.g., ±0.05 mL for a 50 mL buret

  • 51

    Which of the following is NOT a type of buret mentioned in the text?

    Automatic color buret

  • 52

    How does a buret release liquid for measurement?

    Through a stopcock

  • 53

    What is the smallest graduation for a 10 mL Class A buret?

    0.05 or 0.02 mL

  • 54

    What must manufacturers specify when calibrating pipettes, burets, and volumetric flasks?

    The specific temperature for calibration

  • 55

    Why is precise volume measurement important in analytical methods?

    To ensure accuracy and reliability of results

  • 56

    Which of the following best describes the use of a buret in titration?

    Delivers titrant accurately to determine the endpoint

  • 57

    At what temperature are burets typically calibrated by the manufacturer?

    A specific temperature noted by the manufacturer

  • 58

    What is the tolerance for a 5 mL Class A buret?

    ±0.01 mL

  • 59

    Which item is NOT listed as a device for reliable volume measurement?

    Test tube

  • 60

    Which type of buret provides the strictest accuracy according to the text?

    Class A buret

  • 61

    What is the primary function of the stopcock in a buret?

    Controls the flow of liquid dispensed

  • 62

    What is the main function of a volumetric buret?

    To control liquid flow during titrations

  • 63

    Which feature is common to both traditional volumetric and digital burets?

    A mechanism to control liquid dispensing

  • 64

    How is the liquid volume typically read on a traditional buret?

    From the printed volume scale on the side of the tube

  • 65

    What is the purpose of the stopcock on a buret?

    To regulate the liquid flow out of the buret

  • 66

    Which type of buret is designed especially for use with corrosive alkalis?

    Digital or piston buret made with resistant plastics

  • 67

    What does a gas buret measure?

    The volume of gas

  • 68

    How does a gas buret determine the volume of the gas?

    By measuring displacement of liquid (e.g., water or mercury)

  • 69

    Which buret type features a digital display for delivered volume?

    Piston buret and electronic buret

  • 70

    How is an electronic buret different from other burets?

    It automates dispensing and minimizes human error

  • 71

    Which of the following is NOT a use for a traditional liquid buret?

    Measuring gas pressure

  • 72

    What mechanism allows a digital or piston buret to dispense liquid?

    A plunger mechanism

  • 73

    What advances does an electronic buret offer compared to manual types?

    Electronic volume control and display for high precision

  • 74

    Why might plastics be used in constructing digital burets?

    They resist corrosion from chemicals like alkalis

  • 75

    Where is the stopcock located on a traditional liquid buret?

    At the bottom of the buret

  • 76

    What is the primary role of burets in laboratory titrations?

    Delivering measured liquid volumes accurately

  • 77

    What should you rinse the buret with before starting a titration to ensure accuracy?

    The solution to be used in the titration

  • 78

    Why is it important to check and eliminate air bubbles in the buret during titration?

    Air bubbles can cause inaccurate volume readings

  • 79

    From where should you take readings in a buret to avoid parallax error?

    The bottom of the curved meniscus

  • 80

    What is the recommended way to deliver titrant as you approach the endpoint of a titration?

    Deliver dropwise

  • 81

    To what precision should buret readings be estimated during titration?

    To the nearest 0.01 mL

  • 82

    Why do you need to account for the graduation line thickness when reading a buret?

    To improve the accuracy of the volume measurement

  • 83

    How should you fill and drain a buret for titration?

    Carefully

  • 84

    What might happen if you do not fill and drain the buret carefully before titration?

    The volume delivered may be inaccurate

  • 85

    What is the primary reason for draining the liquid slowly and steadily from a buret?

    To ensure precise measurement of the volume delivered

  • 86

    What could cause parallax error when reading a buret?

    Taking readings from above or below the true level of the meniscus

  • 87

    Which type of pipette is designed for transferring a single fixed volume, typically with high precision?

    Volumetric pipette

  • 88

    What is the typical volume range for a micropipette as described in the table?

    0.1-1000 uL (μL)

  • 89

    Which pipette type uses a digital or dial setting to adjust volume?

    Micropipette

  • 90

    Which pipette has graduations that extend all the way to the tip?

    Graduated: Serological pipette

  • 91

    What marks a 'blow-out' pipette, according to the table?

    A frosted band or two thin rings

  • 92

    Which pipette does NOT have 'blow-out' function?

    Volumetric pipette, Graduated: Mohr pipette, Micropipette

  • 93

    What kind of graduation does a volumetric pipette have?

    Single calibration mark

  • 94

    For maximum flexibility in measuring different volumes, which pipette would you use?

    Micropipette, Graduated: Serological pipette, Graduated: Mohr pipette

  • 95

    If you need to accurately transfer 10 mL of a solution, which pipette type is specifically designed for this?

    Volumetric pipette (10 mL fixed volume)

  • 96

    Which pipette type is best for high precision tasks?

    Volumetric pipette

  • 97

    Graduated: Mohr pipettes are characterized by what kind of graduations?

    Graduations stop above tip

  • 98

    Which pipette is marked with a 'blow-out' indicator?

    Graduated: Serological pipette

  • 99

    Which pipette typically does NOT use a digital or dial setting?

    Volumetric pipette, Graduated: Mohr pipette, Graduated: Serological pipette

  • 100

    For which pipette type is knowing where the graduations stop important for accurate volume measurement?

    Graduated: Mohr pipette