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12 Questions

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Electronic Balance for Measuring Mass

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Questions and Answers

What is the purpose of placing a sample in a covered weighing bottle before weighing it?

To speed up the weighing process

To prevent evaporation and absorption of moisture from the air (correct)

To make the sample appear larger than its actual mass

To allow for better visibility of the sample during weighing

Why should balances be placed on heavy surfaces when measuring an object's mass?

To keep the balance stable when not in use

To make the balance more aesthetically pleasing

To improve the accuracy of the measurements taken

To reduce the impact of vibrations from the surrounding environment (correct)

Why is it recommended to weigh volatile liquid samples in a covered container?

To speed up the evaporation process

To allow for better visual inspection of the sample

To reduce the weight of the sample

To prevent sample loss due to evaporation (correct)

How can air currents affect the measurement of a sample's mass on a balance?

They can alter the recorded mass of the sample Signup and view all the answers

What should be done with samples dried in an oven to prevent reabsorption of moisture?

Store them in a desiccator Signup and view all the answers

Why is it important to handle materials placed on a balance using tongs or laboratory tissues?

To avoid contamination and maintain accuracy Signup and view all the answers

How is an object's mass measured using an electronic balance?

By displacing the balance pan downward by a force equal to the product of the sample's mass and the acceleration due to gravity. Signup and view all the answers

What does the current needed to produce a counterbalancing force in an electronic balance indicate?

The mass of the sample being measured. Signup and view all the answers

How is a sample's mass determined using a single-pan, unequal arm balance?

By removing standard weights until the beam is balanced. Signup and view all the answers

What is the purpose of placing a clean and dry container on the balance before weighing a material that is not moisture-sensitive?

To determine the tare weight of the container. Signup and view all the answers

What happens when a sample is added to the balance pan in a single-pan, unequal arm balance?

The beam tilts away from its balance point. Signup and view all the answers

Why are selected standard weights removed in a single-pan, unequal arm balance when weighing a sample?

To bring the beam back into balance after adding a sample. Signup and view all the answers