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Review questions

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This activity contains 20 questions.

Question 1.
Define an element.

End of Question 1

Question 2.
Chemists use symbols to identify each element. Recall which feature is true of these symbols.

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Question 3.

This table summarises the physical properties of metals and non-metals. Recall the name of a substance that has high density and can be stretched into wire.

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Question 4.

Identify what this diagram represents.

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Question 5.
Identify the correct statement about the properties of compounds.

End of Question 5

Question 6.
Identify the correct statement about mixtures.

End of Question 6

Question 7.
Identify which of these would indicate a physical change in a substance.

End of Question 7

Question 8.
Recall when a combination reaction occurs.

End of Question 8

Question 9.
Recall when a decomposition reaction occurs.

End of Question 9

Question 10.

Identify the reaction shown.

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Question 11.
Explain what might happen to a reaction if the temperature is increased, the concentration of reactants is increased, a catalyst is used, and the surface area of the reactants is increased.

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Question 12.

Recall the name of the scientist who developed this model of the atom.

End of Question 12

Question 13.

Recall what the different coloured areas of this electron model represent.

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Question 14.

In this diagram of an atom, identify the correct labels for A, B, C and D respectively.

End of Question 14

Question 15.

Identify the atom in this diagram.

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Question 16.
Identify what the following chemical symbols represent Cu, C, Cl and Co respectively.

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Question 17.

Identify what the chemical structure shown here represents.

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Question 18.
A student conducts an experiment to see whether the size of reactants affects how fast a reaction proceeds. Different sized grains of calcium carbonate are reacted with hydrochloric acid. To make the experiment fair, explain what would need to be done.

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Question 19.

A student carries out an experiment to determine the effect of different types of salt solutions on an iron nail. Identify the purpose of the test tube containing the nail and water only.

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Question 20.

The element boron has an atomic number of 5 and a mass number of 11. Identify the correct representation of this atom.

End of Question 20

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