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Chemistry
1. Question

All of these are compounds EXCEPT for:

2. Question

When large molecules are broken down into smaller ones it is called:

3. Question

Hydrochloric acid forms salts called:

4. Question

The number of electrons shared in a single covalent bond is:

5. Question

The common name for ascorbic acid is:

6. Question

All of these are properties of carbon monoxide EXCEPT for:

7. Question

The Haber Process is used to make:

8. Question

In making bread the enzymes in yeast break down starch to give:

9. Question

The number of atoms in a diatomic molecule is:

10. Question

The second most common gas in the atmosphere is:

11. Question

Quantity of electricity in coulombs = current in amps multiplied by:

12. Question

When an acid neutralises an alkali the pH is likely to be:

13. Question

When black copper oxide is heated with carbon, brown copper metal is produced, which means that compared to copper, carbon is the:

14. Question

The common name for silicon dioxide is:

15. Question

When two solutions are mixed and give a solid product we call it:

16. Question

To make fertilisers and explosives we need:

17. Question

The gas released by baking powder is:

18. Question

Acid soils can be neutralised by adding:

19. Question

All of these are fractions from crude oil EXCEPT for:

20. Question

The number of electrons in a full electron shell is:

21. Question

In the modern Periodic Table the elements are arranged:

22. Question

If a flask containing marble and acid is placed on a balance, the mass decreases steadily with time, which means that:

23. Question

The voltages from the electrochemical series are -2.92 for potassium and +0.34 for copper, which shows that:

24. Question

If the relative atomic mass (RAM) = 1 for hydrogen and 16 for oxygen, the formula mass for H2O2 is:

25. Question

All of these elements form allotropes EXCEPT for:

26. Question

The standard atom used for mass calculations is:

27. Question

The active catalyst in a car′s catalytic converter is:

28. Question

One example of an emulsifying agent is:

29. Question

Dividing the mass in grams by the mass of 1 mole in grams gives:

30. Question

1 mole of gas occupies 24 litres at room temperature and pressure, so the number of moles in
72 litres is:

31. Question

Raising the temperature of a reversible reaction always encourages the:

32. Question

The number of particles in a mole of any gas is always:

33. Question

Alcohol can be made by fermentation of all these EXCEPT for:

34. Question

When limestone is heated strongly it changes into:

35. Question

Any solution with a pH below 7 must be:

36. Question

A ballpoint pen mark can be removed using:

37. Question

The main metal in tin cans used to preserve food is:

38. Question

Reactive metals such as potassium react with water to give hydrogen and:

39. Question

Candied fruits are preserved in a strong solution of:

40. Question

In the equation, carbon monoxide + oxygen → carbon dioxide, a reactant is:

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Chemistry Unit 1