What is a mixture?

• A chemical combination of two or more elements

• A single substance made up of one kind of atom

• A combination of substances that are not chemically combined

• A combination of substances that are chemically combined

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

• A jar of bolts and nails

• A bowl of cereal

• Salt water

• A trail mix

What is a pure substance?

• A mixture of different elements

• A mixture of solids, liquids, and gases

• A physical combination of substances

• A substance made up of a single kind of atom or a chemical combination of elements

Which of the following is NOT a pure substance?

• Helium

• Gold

• Iron

• Salt water

What is a solution?

• A chemical combination of two or more elements

• A mixture of solids

• A single kind of atom

• A mixture where the parts are mixed together so well that they look like a single substance

Which of the following is an example of a solution?

• Fruit salad

• Chocolate chip cookies

• Chicken broth

• Beef stew

What is an element?

• A physical combination of substances

• A mixture of different substances

• A chemical combination of two or more elements

• A substance made up of a single kind of atom

Which of the following is a misconception about air?

• Air includes oxygen, nitrogen, and water vapor

• Air often includes pollutants

• Air is a mixture of elements and compounds

• Air is a pure substance

What is a compound?

• A mixture of solids, liquids, and gases

• A chemical combination of two or more elements with a specific relationship among them

• A physical combination of substances

• A single kind of atom

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

• Seawater

• The atmosphere

• Salt water

• A jar of bolts and nails