chap2: measurement and experimental techniques

Question 1

measure mass

Answer 1

electronic balance
kilograms, grams

Question 2

measure time

Answer 2

digital stopwatch
minutes, seconds

Question 3

measure temperature

Answer 3

mercury thermometer
degree celsius

Question 4

measure volume of liquid

Answer 4

measuring cylinder(1dp), burette(2dp), pipette (fixed amount 25cm3, 50cm5)
cubic centimetre

Question 5

how to read volume of liquid

Answer 5

align eyes to the curve surface of liquid

Question 6

measure volume of gas

Answer 6

gas syringe

Question 7

displacement of water

Answer 7

insoluble gases eg. hydrogen, carbon dioxide, oxygen

Question 8

upward delivery

Answer 8

soluble and less dense gas eg. ammonia

Question 9

downward delivery

Answer 9

soluble and denser gas eg. chloride, chlorine

Question 10

test for purity

Answer 10

fixed melting point and boiling point