What is a pure substance?

• Is made of two types of atoms

• Can be separated by physical means

• Has a fixed composition

• Has a variable composition

What is an element?

• Made of two or more different elements

• Simplest form of matter

• Has a non-uniform composition

• Can be broken down into simpler substances

What can a compound be broken down by?

• Chemical means

• Physical means

• Both physical and chemical means

• None of the above

What is a mixture?

• Has a fixed composition

• Combination of two or more pure substances

• Cannot be separated

• Made of one type of atom

What is a heterogeneous mixture?

• Has a uniform composition

• Has a non-uniform composition

• Can be separated by chemical means

• Is made of one type of atom

Which is an example of a homogeneous mixture?

• Sand

• Saltwater

• Pizza

• Oil and water

What does a homogeneous mixture have?

• Is made of two or more different elements

• Can be separated by physical means

• A uniform composition throughout

• Different parts have different properties

What is true about a compound?

• Has a non-uniform composition

• Cannot be broken down

• Has properties different from its elements

• Made of one type of atom

What is an example of a heterogeneous mixture?

• Saltwater

• Air

• Brass

• Oil and water

What can a mixture be separated by?

• Both chemical and physical means

• Physical means

• None of the above

• Chemical means