Grade 9 Science Quiz

Which of the following is a pure substance?

• Air

• Salt

• Salad

• Soda

Which statement best describes a compound?

• It is made of one type of atom.

• It can be separated by physical means.

• It is made of two or more elements chemically combined.

• It changes state easily.

Which is NOT an example of a mixture?

• Sugar solution

• Carbon dioxide

• Trail mix

• Oil and water

Which mixture has uniform composition throughout?

• Homogeneous mixture

• Heterogeneous mixture

• Suspension

• Colloid

Which type of mixture is fog?

• Solution

• Suspension

• Colloid

• Element

Brass is an alloy of copper and zinc. How is it classified?

• Compound

• Homogeneous mixture

• Heterogeneous mixture

• Element

Which of these is a heterogeneous mixture?

• Salt water

• Vinegar

• Sand and iron filings

• Air

What is the main difference between a compound and a mixture?

• Mixtures are always solid.

• Compounds can be separated by physical means.

• Mixtures are physically combined, compounds are chemically combined.

• Compounds have varying composition.

Which change is a physical change?

• Burning paper

• Melting ice

• Rusting iron

• Cooking egg

Which of these is a chemical change?

• Freezing water

• Breaking glass

• Baking bread

• Melting butter