C3 Chemistry Calculations FT

Question 1

What elements are there in H2SO4 and how many of each element is there?

Answer 1

2 Hydrogen, 1 Sulphur, 4 Oxygen

Question 2

46g of sodium reacts with 71g of chlorine. Sodium chloride is the only product made. What mass of sodium chloride will be made?

Answer 2

117g

Question 3

What is an anomaly?

Answer 3

A result that does not fit the pattern ? they are caused by random errors.

Question 4

Calculate the mean if the three results are: 82, 84 and 83

Answer 4

83

Question 5

What should you do with anomalous results when you calculate a mean?

Answer 5

Don?t include it in your calculation

Question 6

What is the range of these results - 82,84,83

Answer 6

84-82 = 2

Question 7

What is the uncertainty in these measurements - 82, 84, 83?

Answer 7

Uncertainty = Range divided by 2 = 1

Question 8

What is the relative formula mass of water H2O? (Relative atomic masses: Hydrogen = 1, Oxygen = 16)

Answer 8

18

Question 9

What is the unit that we measure mass in when doing chemistry calculations?

Answer 9

g

Question 10

What is the unit that we measure volume in for chemistry calculations?

Answer 10

dm3

Question 11

What are the units for concentration in chemistry?

Answer 11

g/dm3

Question 12

How many cm3 are in 1dm3?

Answer 12

1000