11.2 Making salts – acids and carbonates

Fungi can seriously damage crops leaves, seeds, or fruit, and roots.

• False.

• True.

What do fungicides destroy?

• Bacteria

• Viruses

• Fungi

• Insects

Fungi can..............................

• increase crop yield.

• reduce crop yield.

• reduce fruit sourness.

• reduce crop quality.

• increase crop quality.

Which of the following is a natural source of fungicides?

• Copper sulfate

• Neem tree

• Sulfuric acid

• Copper oxide

Which of the following is an artificial source of fungicides?

• Copper sulfate

• Neem tree

• Sulfuric acid

• Copper oxide

Which reaction is used to make copper sulfate on a large scale?

Reaction 1 Sulfuric acid + copper Copper sulfate + Hydrogen

Reaction 2 Sulfuric acid + Copper oxide Copper sulfate + Water

Reaction 3 Sulfuric acid + Copper carbonate Copper sulfate + Water + Carbon dioxide

• Reactions 1, 2 only.

• Reactions 2, 3 only.

• Reactions 3, 1 only.

• Reaction 1, 2 and 3.

In which reaction is the acid must be concentrated?

Reaction 1 Sulfuric acid + copper Copper sulfate + Hydrogen

Reaction 2 Sulfuric acid + Copper oxide Copper sulfate + Water

Reaction 3 Sulfuric acid + Copper carbonate Copper sulfate + Water + Carbon dioxide

• Reactions 1, 2 only.

• Reactions 2, 3 only.

• Reaction 3 only.

• Reaction 2 only

• Reaction 1 only

In which reaction is dilute acid may be used?

Reaction 1 Sulfuric acid + copper Copper sulfate + Hydrogen

Reaction 2 Sulfuric acid + Copper oxide Copper sulfate + Water

Reaction 3 Sulfuric acid + Copper carbonate Copper sulfate + Water + Carbon dioxide

• Reactions 1, 2 only.

• Reactions 2, 3 only.

• Reaction 3 only.

• Reaction 2 only

• Reaction 1 only

Which reaction cannot be used in school, as it is too hazardous?

Reaction 1 Sulfuric acid + copper Copper sulfate + Hydrogen

Reaction 2 Sulfuric acid + Copper oxide Copper sulfate + Water

Reaction 3 Sulfuric acid + Copper carbonate Copper sulfate + Water + Carbon dioxide

• Reactions 1, 2 only.

• Reactions 2, 3 only.

• Reaction 3 only.

• Reaction 2 only

• Reaction 1 only

Name the gas bubbles that forms when heating the copper carbonate powder into sulfuric acid beaker

• Hydrogen gas

• Oxygen gas

• Water vapour

• Carbon dioxide gas