Chapter 1 - Measurement Techniques

Question 1

What is used to measure time?

Answer 1

stopwatch, 1-2 d.p.

Question 2

What is used to measure temperature?

Answer 2

thermometer, nearest 0.5 degrees

Question 3

What is used to measure mass?

Answer 3

electronic balance, 1-2 d.p.

Question 4

What is used to measure volume of liquids?

Answer 4

beaker, measuring cylinder, pipette, burette

Question 5

What is used to measure volume of gas?

Answer 5

gas syringe

Question 6

What is the most accurate apparatus for measuring volume of liquids?

Answer 6

burette (pipette is exactly 25cm^3, it is not most accurate as it can only carry one amount)

Question 7

What apparatus only measures an exact/fixed volume?

Answer 7

pipette

Question 8

what is a crucible for?

Answer 8

heating of solids

Question 9

`what are the 3 methods of collecting gas?

Answer 9

downward displacement of water, downward delivery, and upward delivery

Question 10

When can you use downward displacement of water and examples of those types of gases?

Answer 10

when gas is insoluble/ slightly soluble. hydrogen, oxygen

Question 11

What is the difference between downward and upward delivery?

Answer 11

downward delivery is used when gas is denser than air (CO2, Cl), upward delivery is used when gas is less dense than air (H2, NH3).

Question 12

What is the 3 different types of drying agents, what do they dry and what is their state?

Answer 12

concentrated sulfuric acid, dries most gases except ammonia (extremely soluble) and its state is liquid

calcium oxide (CaO or quicklime), used to dry ammonia, cannot be used to dry acidic gases (SO2, NO2, CO2), solid state

fused calcium chloride, used to dry most gases except ammonia, solid state