Pure Substances and Mixtures Assessment

What is a pure substance?

• A substance made up of different types of atoms

• A substance that is always made up of the same combination of atoms

• A mixture of elements and compounds

• A substance that changes its composition frequently

Which of the following is an example of a pure substance?

• Trail mix

• Soda

• Water molecules

• Air

What defines a mixture?

• A single element

• A compound with a fixed ratio

• Two or more substances physically blended but not chemically bonded

• A pure substance with a constant composition

Which of the following is NOT a mixture?

• Gold

• Trail mix

• Soda

• Air

What is a heterogeneous mixture?

• A mixture where substances are evenly mixed

• A mixture where substances are not evenly mixed

• A mixture that is chemically bonded

• A mixture that is a pure substance

Which of the following is an example of a homogeneous mixture?

• Trail mix

• Brass

• Sand and water

• Oil and vinegar

What is another name for a homogeneous mixture?

• Compound

• Solution

• Element

• Suspension

In a solution, what is the solvent?

• The substance in the smallest quantity

• The substance that dissolves other substances

• The substance that is visible

• The substance that is a solid

What is the main component of air as a solution?

• Oxygen

• Carbon dioxide

• Nitrogen

• Argon

What is considered a universal solvent because it can dissolve many substances?

• Ethanol

• Water

• Oxygen

• Nitrogen