10 Science - Week 11

Identify which of the following is a composition reaction.

• iron + sulfur → iron sulfide

• hydrochloric acid + magnesium → hydrogen + magnesium chloride

• water → hydrogen + oxygen

• sodium chloride + silver nitrate → sodium nitrate + silver chloride

Identify which of the following is a composition reaction.

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One way of protecting iron or steel from rusting is by galvanizing it – that is, coating it in a layer of zinc metal, Zn. This reacts with oxygen, O₂, in the air to produce a protective layer of solid zinc oxide, ZnO.

Construct a word equation for this reaction. You can copy and paste this arrow: →

Determine which of the following equations represent decomposition reactions.

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Select the option that best completes the sentence. 

A composition reaction is one that has:

• a single reactant

• a single product

Recall the general form of composition reactions. 

• A + B -> AB

• AB -> A + B

• A + BC -> BC + A

• A + BC -> AC + B

The metal sodium reacts with chlorine gas in a composition reaction.

Identify the product that is most likely to form.

• Hydrochloric Acid

• Sodium Hydroxide

• Iron oxide

• Sodium Chloride

Select which of the following are decomposition reactions

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Determine which of the following word equations describes a precipitation reaction.

• methane gas + oxygen gas → carbon dioxide gas + water vapour

• magnesium nitrate + sodium hydroxide → magnesium hydroxide + sodium nitrate

• copper oxide + carbon → copper metal + carbon dioxide gas

• magnesium carbonate → magnesium oxide + carbon dioxide gas

Select the symbol that is used to show the state of matter of a precipitate.

• (g)

• (l)

• (s)

• (aq)