Metals Reacting with Oxygen or Water

When metals react with oxygen, they usually form:

• acids

• bases

• metal oxides

• salts

Which metal reacts quickly with cold water to form a hydroxide and hydrogen gas?

• iron

• copper

• sodium

• gold

Which of the following metals does NOT react with oxygen?

• iron

• gold

• magnesium

• calcium

Which gas is produced when calcium reacts with water?

• hydrogen

• oxygen

• carbon dioxide

• nitrogen

What are the products formed when potassium reacts with water?

• Potassium hydroxide and hydrogen gas

• Potassium oxide and hydrogen gas

• Potassium carbonate and oxygen gas

• Potassium nitrate and carbon dioxide

Some metals need to be set on fire first to react with oxygen. What type of reaction occurs when metals react with oxygen in this way?

• decomposition

• neutralisation

• reduction

• combustion

Which metal would react the most vigorously with water?

• silver

• lead

• potassium

• iron

Which sign in an equation shows that a reaction has happened?

• =

• +

• -

• --->

What is the law of 'conservation of mass'?

• It's a law in chemistry that shows us how new atoms are created in reactions.

• It's a law in chemistry that states that atoms cannot be created or destroyed, they are just rearranged during a reaction.

• It's a law in chemistry that shows us how new atoms are destroyed in reactions.

• It's a law in chemistry that shows us how to sustain and conserve mass so that it will always exist.

What are some signs that a chemical reaction is taking place?

• colour change

• a new product is formed

• a smell is produced

• nothing happens