Pre-Laboratory Questions
Describe how to use the “difference method” when performing mass determinations. Why are masses in the chemistry laboratory usually determined by the difference method (using a beaker to contain the object to be weighted, rather than just placing the object directly on the pan of the balance)?
Why should the mass of an object never be determined while the object’s temperature is above room temperature?
If you weigh a hot object on the balance, the reading will be higher, the same, or lower than if it had been weighed after it cools to room temperature?
Why should liquids never be poured on or near the balance?
