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Chemistry

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Mandy Johnston

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Cards in this guide (12)
The correct method of removing a glass stopper is to grasp it

between the secon and third finger

Which of these items should be used to heat a solid in the presence of air

a crucible with the lid slightly ajar

The most important part of heating fluid in a test tube is to

maintain a consistent temperature thoughout

Heating the liquid in a test tube

it vapourise from the test tube

When reading the volume of fluid in a graduated cylinder the eye should be

Level with the bottom of the fluid's meniscus

A space probe has returned samples to earth of crystals found on a distant planet In studying these crystals scientist discovered that a 0994g sample will absorb 2027 J heat when the temperature

40.78

How many significant digits are in the number 85000

Two

Which of these measurements has 2 significant digits 50.4 g

50.4 has three significant digits.

How many significant digits are in this number 60076

Five

How many significant digits are in 1.076000

This number has seven significant digits.

How many significant digits in the number 456

3 significant figures.

The main reason for learning to correctly pour fluids in a laboratory is to conserve costly chemicals true or fasle

false

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