Yr9 Sci Ch7 Chem Revision

A particular chemical reaction can be described by the word equation: hydrochloric acid + magnesium carbonate → magnesium chloride + water + carbon dioxide Select the two reactants in this chemical reaction.

• Hydrochloric acid

• Magnesium chloride

• Water

• Magnesium carbonate

• Carbon dioxide

A particular chemical reaction can be described by the word equation: hydrochloric acid + magnesium carbonate → magnesium chloride + water + carbon dioxide. Select all the products of the reaction.

• Hydrochloric acid

• Magnesium chloride

• Water

• Magnesium carbonate

• Carbon dioxide

A particular chemical reaction can be described by the word equation: hydrochloric acid + magnesium carbonate → magnesium chloride + water + carbon dioxide Identify from which compound did the atoms present in the carbon dioxide come?

• Hydrochloric acid

• Magnesium chloride

• Water

• Magnesium carbonate

• Carbon dioxide

1. This is an exothermic reaction, so the reactants have more energy stored in their chemical bonds than the products. True or false? Explain.

What observable evidence demonstrates that a chemical reaction has taken place?

• The apparent disappearance of a substance

• The appearance of a new substance

• A release of energy (often heating the surroundings noticeably)

• Absorption of energy (cooling the surroundings)

• All of the above

Use the Law of Conservation of Mass to explain why it is incorrect to say that when a candle burns it disappears.

The Law of Constant Proportions states that a compound always contains ______________ relative amounts of each element.

• the same

• different

• random

• variable

Nitrogen reacts with hydrogen to form ammonia. I. This is a synthesis reaction that over 50% of the world’s food production relies upon. II. This process produces more carbon dioxide than any other synthesis reaction. III. Forming ammonia from decomposing organisms is being investigated as an alternative. IV. As ammonia is a natural product there are no concerns with excess production. Which of the following statements are correct?

• A. I only

• B. I and II

• C. II and III

• D. III and IV only.

The liquids in the bottles below are labelled with their pH. Which of the bottles is most likely to contain?

a) Distilled water​ (a)  

b) A strong acid​ (b)  

c) Black coffee​ (c)  

d) Bathroom surface cleaner​ (d)  

• Bottle C
• Bottle A
• Bottle B
• Bottle D
• Bottle E

Predict the salts that would result from the neutralisation reaction between:

a) Magnesium oxide and hydrochloric acid ->​ (a)  

b) Copper (II) oxide and sulfuric acid ->​ (b)  

c) Sodium hydroixde and ethanoic acid​ ->​ (c)  

d) Sodium oxide and nitric acid -> ​ (d)  

• Magnesium chloride
• Copper (II) Sulfate
• Sodium nitrate
• Sodium acetate
• water
• Sodium ethnoate
• Magnesium