Reactions and Sustainability

3 metals were added to water. Which of the metals is the most reactive?

• A

• B

• C

Potassium is more reactive than iron. Will potassium react with iron oxide?

• Yes

• No

What do you get if you react potassium with iron oxide?

• potassium iron + oxide

• potassium oxide + iron

• potassium oxide + water

• potassium oxide + hydrogen

Iron is added to a gold nitrate solution. A yellowy precipitate (solid) is formed. What is it called?

• Iron

• Nitrous carbonate

• Iron nitrate

• Gold

Why can you not extract sodium from sodium ore with carbon?

• Sodium is the most reactive metal

• It is too expensive

• Carbon is less reactive than sodium

• It produces carbon monoxide

What salt is made when aluminium reacts with hydrochloric acid?

• aluminium chloride

• aluminium chloric

• aluminium chlorine

• aluminium hydrochloride

What gas is made when aluminium reacts with hydrochloric acid?

• chlorine

• hydrogen

• oxygen

• carbon dioxide

3g of copper is heated to that it forms copper oxide. What is the mass of this compound?

• Less than 3g

• 3g

• More than 3g

3g of copper is heated so that it forms 3.9g of copper oxide. Why is it heavier?

• Copper bonded with oxygen

• Copper has mixed with oxygen

• Oxygen formed a new layer on the copper