1. State 2 ways in which more solute could be dissolved in a saturated solution

Question 1 of 17

2. Balance the following equation: WO₃ + H₂ → W + H₂O

Question 2 of 17

3. What gas makes up 78% of Earth's atomosphere?

Question 3 of 17

4. Describe a way in which the rusting of iron could be used to show the approximate percentage of oxygen in air

Question 4 of 17

5. A substance is found to melt over a range of temperatures. Is it a pure substance or a mixture of substances?

Question 5 of 17

6. Define the term Solubility

Question 6 of 17

7. With gas syringes in a closed system, 200cm³ of air is passed back and forward over hot copper until the oxygen is used up. At the end, 160cm³ remains. Calculate the percentage by volume of oxygen in the air.

Question 7 of 17

8. State and explain how increasing temperature affects the diffusion of a gas

Question 8 of 17

9. Explain how a chromatogram shows that different dyes are different from each other

Question 9 of 17

10. When preparing hydrated copper(II) sulfate crystals starting from copper(II) oxide, why is an excess of copper (II) oxide added?

Question 10 of 17

11. A graph shows the solubility of sodium chloride in water at 50°C is 34g/100g. At that temperature, what mass of sodium chloride will dissolve in 200g water?

Question 11 of 17

12. Define the term Saturated Solution

Question 12 of 17

13. Can a base neutralise an acid?

Question 13 of 17

14. In paper chromatography, why is the baseline drawn in pencil?

Question 14 of 17

15. What is the formula for calculating an Rf value?

Question 15 of 17

16. Describe a test to show whether water is pure

Question 16 of 17

17. What is the name for this piece of lab equipment?

Question 17 of 17