C4 Quantitative Chemistry

Question 1

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

Answer 1

1. 2 Hydrogen, 1 Sulphur, 4 Oxygen

Question 2

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

2. 117g

Question 3

3. What is an anomaly?

Answer 3

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

Question 4

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

Answer 4

(82+84+83)/2 = 83

Question 5

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

Answer 5

5. Don’t include it in your calculation

Question 6

6. What is the range of this set of results - 82, 84, 83

Answer 6

6. 84-82 = 2

Question 7

7. What is the uncertainty in the measurements 82, 84, 83

Answer 7

7. Range ÷2 = 1

Question 8

8. What is the relative formula mass of water H2O?

Relative atomic masses: Hydrogen = 1, Oxygen = 16

Answer 8

8. 18

Question 9

9. What is the unit that we measure mass in?

Answer 9

9. g

Question 10

10. What is the unit that we measure volume in?

Answer 10

10. dm3

Question 11

11. What are the units for concentration?

Answer 11

11. g/dm3

Question 12

12. How many cm3 are in 1dm3?

Answer 12

1000