CaribQuiz - Chemistry
Chemistry
1. Question

Ammonia gas spreads out faster than hydrogen chloride, showing that it is:

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2. Question

The simplest ratio of atoms in a compound is given by the:

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3. Question

A flame test colour of red could indicate the presence of a compound of:

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4. Question

Potassium reacts quickly with water but we do not use it with acids because:

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5. Question

Particles are furthest apart in:

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6. Question

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

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7. Question

A salt that contains water of crystallisation is:

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8. Question

The electrical charges on a proton and an electron are:

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9. Question

The number of atoms in this formula, H2SO4, is:

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10. Question

All of these reactions are exothermic EXCEPT for:

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11. Question

Adding mineral water to anhydrous copper sulphate turns it:

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12. Question

All of these are properties of carbon monoxide EXCEPT for:

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13. Question

The metal used in food containers whose surface is protected by a strong oxide layer is:

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14. Question

To make cell walls, plants must have:

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15. Question

A salt that is anhydrous contains no:

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16. Question

The two common varieties of chlorine atoms are called:

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17. Question

In the reactivity series of metals the order is: sodium, calcium, magnesium, aluminium, which means that the most reactive metal is:

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18. Question

Hydrochloric acid forms salts called:

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19. Question

The units we use for heat given out by a reaction are:

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20. Question

Raising the temperature of a reversible reaction always encourages the:

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21. Question

All of these are alkenes EXCEPT for:

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22. Question

In a titration the long tube with a volume scale is a:

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23. Question

In electrolysing a solution of copper sulphate using copper electrodes, the anode:

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24. Question

The charge on a sodium ion is always:

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25. Question

Different structures based on the same molecular formula are called:

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26. Question

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

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27. Question

The sharp-tasting compound in vinegar is:

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28. Question

A plastic that softens every time it is heated is said to be:

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29. Question

1 mole of sodium carbonate weighs 106 g, so the number of moles in 318 g will be:

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30. Question

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

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31. Question

A liquid compound that conducts electricity is:

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32. Question

Common salt can be used to make all of these EXCEPT for:

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33. Question

The number of atoms in a diatomic molecule is:

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34. Question

When aluminium is extracted by electrolysis, cryolite is added to:

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35. Question

None of these solutions in water conducts electricity EXCEPT for:

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36. Question

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

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37. Question

The gas released by baking powder is:

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38. Question

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

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39. Question

To work out the heat change in a reaction we need to know just three things, the mass, the temperature change and the:

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40. Question

All of these are used as food additives EXCEPT for:

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