Which substance reacts with hydrochloric acid to produce hydrogen?

• calcium oxide

• copper

• magnesium

• sodium hydroxide

A solution has a pH = 14. What substance must be present in the solution?

• sodium ions, Na⁺

• hydrogen ions, H⁺

• hydroxide ions, OH^-

• oxide ions, O^2-

What does the term strong acid mean in relation to hydrochloric acid, HCl?

• Each molecule can produce two hydrogen ions

• It is fully ionised in aqueous solution

• Its aqueous solution has a pH much greater than 7

• Its salt, silver chloride, is insoluble in water

The word equation shows a chemical reaction.

substance S + sulfuric acid -----> carbon dioxide + a salt + water

What could substance S be?

• iron

• magnesium oxide

• potassium hydroxide

• zinc carbonate

Which compound is a base?

• barium oxide

• copper(II) sulfate

• magnesium carbonate

• sodium chloride

A volume of aqueous nitric acid is split on the laboratory floor. Name a compound that could be added to the solution to neutralise the nitric acid.

What is the chemical formula of aqueous ammonia?

• Al(OH)₃

• HNO₃

• NH₃

• NH₄OH

Complete the equation by filling in the missing substance.

sodium hydroxide + hydrochloric acid ----> sodium chloride + _______________

Complete the equation by filling in the missing chemical formula and balancing the equation.

CuO + _________ ----> Cu(NO₃)₂ + H₂O

Complete the equation by filling in the missing chemical formula and balancing the equation.

2Fe + 6HCl -----> 2FeCl₃ + ____________