Unit 3 Review

Is this an element, mixture or compound?

• Element

• Mixture

• Compound

• Element

• Compound

• Homogeneous Mixture

• Heterogeneous Mixture

H_{2 is an example of a(n)...}

• Element

• Compound

• Molecule

• Heterogeneous Mixture

• Element

• Compound

• Homogeneous Mixture

• Heterogeneous Mixture

• A pure substance consists of only one type of element.

• A pure substance has a definite chemical composition.

• A pure substance cannot be broken down into simpler substances.

• A pure substance is normally found as a solid at room temperature.

Andy wants to study a compound in his science class. Which of these is a compound?

• salt

• iron

• helium

• hydrogen

Which of the following is formed when two elements combine chemically?

• an atom

• a compound

• an electron

• a mixture

Which of the following is an example of a container that is filled with a pure substance rather than with a mixture?

• a tire filled with air

• a jar filled with salt water

• a balloon filled with helium

• a glass filled with chocolate milk

The diagrams show three containers of gas. Which list correctly describes the gases in containers R, S and T?

• R = element,

  S = compound,

  T = mixture

• R = compound,

  S = element,

  T = mixture

• R = element,

  S = mixture,

  T = compound

• R = mixture,

  S = element,

  T = compound

Is a a rusting bicycle a chemical or physical change?

• Chemcial

• Physical