Unit2. Atoms, Elements and Compounds

These contain only one kind of atom. 

• Element

• Mixture

• Compound

• Water

Carbon Dioxide is a ______ 

• compound

• element

• mixture

The air is a _________. 

• element 

• compound

• mixture 

• energy 

What is salad?

• Energy

• Elements

• Compounds

• Mixture

What elements make up calcium hydroxide? (tick all the correct boxes)

• Calcium

• Oxygen

• Potassium

• hydrogen

What elements make up silver nitrate? (tick all correct boxes)

• nitric acid

• nitrogen

• silver

• oxygen

What elements make up calcium hydroxide? (tick all the incorrect boxes)

• calcium

• carbon

• hydrogen

• nitrogen

Water is an element

• True

• False

The diagram shows...

• elements

• compounds

• mixture of compounds

• mixture of elements

When forming Fe²⁺, an iron atom has (gained/lost) _________ (#) ___ electrons