measurement and experimental techniques

Question 1

SI unit and apparatus for time

Answer 1

SI unit: (s) seconds

apparatus: digital stopwatch

Question 2

SI unit and apparatus for temp

Answer 2

SI unit: (k) kelvin

apparatus: laboratory thermometer

Question 3

SI unit and apparatus for mass

Answer 3

SI unit: (Kg) kilogram

apparatus: electronic balance

Question 4

SI unit and apparatus for volume

Answer 4

SI unit: (m3) cubic metre

apparatus: beaker, measuring cylinder, pipette and burette

Question 5

which apparatus between pipette and burette is the most accurate?

Answer 5

pipette

Question 6

what is the fixed volume of pipette?

Answer 6

20.0 or 25.0 cm3

Question 7

what are the 4 ways to collect gas?

Answer 7

displacement of water
downward delivery
upward delivery
gas syringe

Question 8

displacement of water collects what type of gas? name the gases.

Answer 8

for insoluble gas. such as…
hydrogen
oxygen
carbon dioxide

Question 9

downward delivery collects what type of gas? name the gases.

Answer 9

for denser gas. such as…
hydrogen chloride
chlorine
CO2

Question 10

upward delivery collects what type of gas? name the gases.

Answer 10

for less dense gas. such as…
hydrogen
ammonia

Question 11

what is the one way to measure the gas collected?

Answer 11

gas syringe

Question 12

what are the drying agents used for?

Answer 12

to remove moisture (water/water vapour) from gas

Question 13

what are the 3 types of dring agents? and used for which gases

Answer 13

1) concentrated sulfuric agents - all gases except ammonia
2) quicklime/ calcium oxide - ammonia only
3) fused calcium chloride - most gases