Measurement And Experimental Techniques

Question 1

Mass

Answer 1

Kilogram (kg)
1kg = 1000g
1 tonne = 1000kg
Beam balance (+-0.01g)
Electronic balance (+-0.01g)

Question 2

Time

Answer 2

Second (s)
1h = 60min
1min = 60s
Stopwatch (+-0.01s)

Question 3

Temperature

Answer 3

Kelvin (k)
0 degree celcius = 0 + 273 kelvin
Alcohol thermometer (+-0.5 degree celcius)
Mercury-in-glass thermometer (+-0.5 degree celcius)

Question 4

Volume

Answer 4

Cubic metre (m^3)
1m^3 = 1000dm^3
1dm^3 = 1000cm^3
Beaker
Measuring cylinder
Burette
Pipette

Question 5

Beaker

Answer 5

Measures approximate volumes

Not suitable for accurate measurements

Question 6

Measuring cylinder

Answer 6

Measures volumes to the nearest 0.5cm^3
Each division represents 1cm^3
Not suitable for accurate measurements

Question 7

Burette

Answer 7

Measures volumes to the nearest 0.05cm^3, up to 50.00cm^3
Each division represents 0.10cm^3
Used for accurate measurements

Question 8

Pipette

Answer 8

Measures fixed volumes very accurately
No divisions
Used for accurate measurements

Question 9

What is meniscus

Answer 9

Curved surface

Question 10

What is gas syringe used for?

Answer 10

Used to measure the volume of a gas

Max 100cm^3

Question 11

Methods of collecting gases

Answer 11

1. Displacement of water
2. Downward delivery
3. Upward delivery

Question 12

Displacement of water

Answer 12

Suitable for collecting gases that are insoluble or slightly soluble in water

Carbon dioxide, hydrogen and oxygen

Not suitable if you want to collect a dry sample of gas

Question 13

Downward delivery

Answer 13

Used to collect gases that are soluble in water and denser than air

Chlorine and hydrogen chlorine

Question 14

Upward delivery

Answer 14

Used to collect gases that are soluble in water and less dense than air

Ammonia