Reactions of Metals with Water and Air

What happens to magnesium when it is heated?

• It turns into a black solid.

• It burns with a bright white light.

• It melts into a silvery ball.

• It fizzes and moves about the surface.

What colour flame does potassium produce when it reacts with water?

• Orange

• Blue

• Lilac

• Green

Which metal forms a white solid in the solution when it reacts with water?

• Potassium

• Sodium

• Calcium

• Magnesium

What is the colour of the solid formed when copper is heated?

• White

• Black

• Red

• Blue

Which of the following metals floats and fizzes when it reacts with water?

• Copper

• Magnesium

• Sodium

• Calcium

What happens to sodium when it reacts with water?

• It sinks and rises.

• It forms a lilac flame.

• It melts to form a silvery ball.

• It turns into a black solid.

Which metal is known to crackle or explode at the end of its reaction with water?

• Calcium

• Sodium

• Potassium

• Magnesium

What is released when calcium reacts with water?

• Light

• Heat

• Sound

• Smoke