12 Questions
What is the purpose of placing a sample in a covered weighing bottle before weighing it?
To prevent evaporation and absorption of moisture from the air
Why should balances be placed on heavy surfaces when measuring an object's mass?
To reduce the impact of vibrations from the surrounding environment
Why is it recommended to weigh volatile liquid samples in a covered container?
To prevent sample loss due to evaporation
How can air currents affect the measurement of a sample's mass on a balance?
They can alter the recorded mass of the sample
What should be done with samples dried in an oven to prevent reabsorption of moisture?
Store them in a desiccator
Why is it important to handle materials placed on a balance using tongs or laboratory tissues?
To avoid contamination and maintain accuracy
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.
What does the current needed to produce a counterbalancing force in an electronic balance indicate?
The mass of the sample being measured.
How is a sample's mass determined using a single-pan, unequal arm balance?
By removing standard weights until the beam is balanced.
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.
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.
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.
Learn about how an object's mass is measured using an electronic balance. Discover the process involving electromagnets and counterbalancing forces to accurately determine the mass of a sample.
Make Your Own Quizzes and Flashcards
Convert your notes into interactive study material.
Get started for free
