Ch 1 Experimental Chemistry

Question 1

(Measurement of time) Digital stopwatch and its accuracy

Answer 1

Digital stopwatch: Hundredth of a second (0.01 s)

Question 2

(Measurement of time) Analogue stopwatch and its accuracy

Answer 2

Analogue stopwatch: Tenth of a second (0.1 s)

Question 3

Equipment for measurement of temperature:

Answer 3

1. Alcohol thermometer (-10 - 110°C)
2. Digital laboratory thermometer
3. Oral digital thermometer
4. Temperature sensor connected to data logger

Question 4

Equipment for measurement of length:

Answer 4

1. Metre ruler
2. Measuring tape

Question 5

Equipment for measurement of mass:

Answer 5

1. Beam balance
2. Electronic balance (0.01g accuracy)

Question 6

Equipment for measurement of volume:

Answer 6

1. Pipette
2. Volumetric flask
3. Measuring cylinder
4. Burette

Question 7

Pipette accuracy:

Answer 7

Measures fixed accurate volumes e.g. 10cm^3, 25cm^3

Question 8

Volumetric flask accuracy:

Answer 8

Measures larger fixed accurate volumes e.g. 100cm^3, 250cm^3

Question 9

Measuring cylinder accuracy:

Answer 9

Measures a range of volumes to the nearest 0.5cm^3, e.g. 31.5cm^3, 10.0cm^3

Question 10

Burette accuracy:

Answer 10

Measures a range of volumes to the nearest 0.05cm^3, e.g. 31.55cm^3, 23.00cm^3

Question 11

Equipment to measures volume of gas:

Answer 11

Gas syringe