MEASUREMENT AND EXPERIMENTAL TECHNIQUES

Question 1

mass is measured using _______, its precision is _______

Answer 1

electronic balance, 0.00g to 0.0000g

Question 2

time is measured using ____, precision____

Answer 2

digital stopwatch , 0.01s

though its recorded to the nearest second, due to the human reaction tim

Question 3

1 tonne= _________kg = ___________g

Answer 3

1000kg, 1 000 000g

Question 4

1h = ______min = _________sec

Answer 4

60min, 3600s

Question 5

temperature is measured using

Answer 5

alcohol/mercury thermometer (0.5 degree C)

- data logger/ digital thermomerter for more accurate reading

Question 6

volume precision of pipette

Answer 6

20.0 cm cube/ 25.0 cm cube

Question 7

volume precision of burette

Answer 7

0.05 cm cube

Question 8

volume precision of measuring cylinder

Answer 8

o.5 cm cube

Question 9

what is used to collect gas

Answer 9

100cm cube graduated gas syringe

Question 10

3 ways to collect gas are___________

Answer 10

displacement of water, upward delivery, downward delivery

Question 11

gases collected by displacement of water

Answer 11

carbon dioxide, oxygen, hydrogen

Question 12

gases collected by upward delivery

Answer 12

ammonia

Question 13

gases collected by downward delivery

Answer 13

hydrogen chloride, sulfur dioxide, chlorine

Question 14

three methods of drying gas

Answer 14

1. using concentrated sulfuric acid
2. using quicklime( CaO)
3. using fused calcium chloride

Question 15

which method of drying a gas cannot be used to dry ammonia? why?

Answer 15

using H2SO4, as NH3 reacts with H2SO4 to give ammonium sulfate

Question 16

which two gases are less dense than air?

Answer 16

hydrogen and ammonia