2.3-Elements and Compounds - 2

What is a mixture?

• A chemical combination of two or more substances

• A physical combination of two or more substances that are not chemically joined

• A pure substance with uniform composition

• A substance made up of only one element

Which of the following best describes a pure substance?

• It is made up of various elements chemically combined with a variable ratio

• It is a mixture with uniform composition

• It is made up of two or more elements chemically combined with a fixed ratio

• It is a substance with no definite composition

Which of the following best defines a homogeneous mixture?

• A mixture with non-uniform composition

• A mixture with variable composition

• A mixture with uniform composition

• A mixture with no composition

Mixtures have ____ composition.

• Fixed

• Only one type of

• Variable

• Pure

What are the two main types of mixtures?

• Solid and liquid

• Metal and non-metal

• Homogeneous and heterogeneous

• Organic and inorganic

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

• Air

• Water

• Salad

• Sugar solution

Which of the following is an example of a mixture?

• Iron

• Oxygen

• Saltwater

• Gold

Pure substances have ____ composition.

• Variable

• Fluctuating

• Fixed

• Always changing