Revision Activity Version 3

The three rectangles show the arrangements of the particles in each of the three states of matter.

X, Y and Z represent the processes needed to change from one state to another. What are the processes X, Y and Z?

• X = melting | Y = condensing | Z = evaporating

• X = evaporating | Y = melting | Z = freezing

• X = melting | Y = freezing | Z = condensing

• X = freezing | Y = evaporating | Z = condensing

Which substance is a pure compound?

• air

• brass

• ethanol

• petroleum

The Group I element potassium forms an ionic bond with the Group VII element fluorine.

Which two ions are produced?

• K⁺ and F⁺

• K⁺ and F^-

• K^- and F^-

• K^- and F⁺

An isotope of lithium has the symbol ⁷Li.

What is the arrangement of electrons in one atom of this isotope of lithium?

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• 
• 
• 

Fluorine, F2, is in the same group of the Periodic Table as chlorine, Cl 2.

Which diagram represents the arrangement of the outer-shell electrons in a molecule of fluorine?

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• 
• 
• 

Which use of graphite depends on the layers of carbon atoms being able to slide over each

other?

• cutting tools

• electrodes

• jewellery

• lubricant

Which equations are balanced?

1 Fe2O3 + 3CO → 2Fe + 3CO2

2 ZnCO3 + 2HCl → ZnCl 2 + CO2 + 2H2O

3 Mg(NO3)2 + NaOH → Mg(OH)2 + 2NaNO3

4 CaCO3 + H2SO4 → CaSO4 + H2O + CO2

• 1 and 2

• 1 and 4

• 2 and 3

• 3 and 4

The equation for the combustion of methane is shown.

CH4 + 2O2 → CO2 + 2H2O

Which mass of methane produces 36 g of water?

• 16 g

• 18 g

• 32 g

• 64 g

The reaction pathway diagram for a reaction is shown. Which statements are correct?

1 The reaction is exothermic.

2 The reaction is endothermic.

3 The temperature of the surroundings increases.

4 The temperature of the surroundings decreases.

• 1 and 3

• 1 and 4

• 2 and 3

• 2 and 4

Which process involves a chemical change?

• adding sodium to water

• boiling water

• dissolving sodium chloride in water

• producing water from aqueous sodium chloride