Chemistry Revision 2 (Unit 1 - 11)

The diagram shows an experiment to find the formula of magnesium oxide. Which piece of apparatus would be needed in addition to those shown?

• a balance

• a measuring cylinder

• a spatula

• a thermometer

Electrons from each element are shared by both of the elements in a compound. Which compound matches this description?

• lead bromide

• sodium chloride

• water

• zinc oxide

The equation shows the reaction between magnesium and sulfuric acid. In this reaction, what mass of magnesium sulfate will be formed when 6g of magnesium reacts with excess sulfuric acid?

• 8

• 24

• 30

• 60

Element X has six electrons in its outer shell. How could the element react?

• by gaining two electrons to form a positive ion

• by losing six electrons to form a negative ion

• by sharing two electrons with two electrons from another element to form two covalent bonds

• by sharing two electrons with two electrons from another element to form four covalent bonds

What is the balanced chemical equation for the reaction between calcium and water?

• A

• B

• C

• D

The diagram shows an electrical cable. Which statement about the substances used is correct?

• The coating is plastic because it conducts electricity well.

• The core is copper because it conducts electricity well.

• The core is copper because it is cheap and strong.

• The core is iron because it is cheap and strong.

In which equation is the underlined substance acting as a reducing agent?

• A

• B

• C

• D

The diagram shows an experiment to compare the rate of reaction when a metal is added to hydrochloric acid. In which test-tube is the reaction fastest?

• A

• B

• C

• D

Heating pink cobalt(II) chloride crystals forms a blue solid and steam. The blue solid turns pink when water is added. Which terms describe the pink cobalt (II) chloride and the reaction?

• A

• B

• C

• D

Which statement about the reaction of acids is correct?

• They react with ammonium salts to form a salt and ammonia only.

• They react with metal carbonates to give a salt and carbon dioxide only.

• They react with metal hydroxides to give a salt and water only.

• They react with metals to give a salt, hydrogen and water only.