Reactivity

Question 1

P S L C M A Z I T L C M S G P

Answer 1

Potassium Sodium Lithium Calcium Magnesium Aluminium Zinc Iron Tin Lead Copper Mercury Silver Gold Platinum

Question 2

Metals that react with water

Answer 2

Form a metal hydroxide and hydrogen

Metal + water —> metal hydroxide + hydrogen

Question 3

Metal that reacts with dilute acids

Answer 3

Form a salt and hydrogen

Metal + acid —> salt + hydrogen

Question 4

Nitric acid

Answer 4

Nitrates

Question 5

Sulfuric acid

Answer 5

Sulfates

Question 6

Hydrochloric acid

Answer 6

Chlorides

Question 7

Rusting

Answer 7

Iron and steel rust slowest in air and water

Question 8

What happens to steel and iron when they rust?

Answer 8

They form brown flakes that gradually crumble and break away.

Question 9

How to prevent rusting

Answer 9

By using a physical barrier on the metal such as paint or oil to keep out the air and water. Cheap but not suitable in occasions.

Attach blocks of more reactive metal such as zinc or magnesium. The more reactive metal will react with the water and air instead of iron or steel. It is called sacrificial protection