4. FT 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

4. 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 the results in question 4.

Answer 6

6. 84-82 = 2

Question 7

7. What is the uncertainty in the measurements?

Answer 7

7. The uncertainty is the range ÷2 So for this 2÷2= 1

Question 8

8. How do you calculate the relative formula mass of water H2O?

Answer 8

8. Add together all of the masses (18)

Question 9

(Relative atomic masses: Hydrogen = 1, Oxygen = 16)

Answer 9

9. g

Question 10

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

Answer 10

10. dm3

Question 11

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

Answer 11

11. g/dm3

Question 12

11. What are the units for concentration?

Answer 12

12. 1000