Elements, Compounds, and Mixtures: A Pre-Test on Matter

What is the smallest unit of an element that maintains the properties of that element?

• Compound

• Molecule

• Atom

• Mixture

Which of the following is a compound?

• Neon (Ne)

• Air

What distinguishes a mixture from a compound?

• Mixtures can only be separated by chemical means.

• Compounds have properties different from their component elements, while mixtures retain the properties of their components.

• Mixtures are always solid.

• Compounds are made of only one type of atom.

Which state of matter has a definite volume but no definite shape?

• Solid

• Liquid

• Gas

• Plasma

In which state of matter are particles packed tightly together in a fixed position?

• Solid

• Liquid

• Gas

• Plasma

What is the process called when a liquid changes into a gas?

• Freezing

• Melting

• Evaporation

• Condensation

Which of the following is NOT a mixture?

• Salt water

• Air

• Salad

What is the main difference between a homogeneous mixture and a heterogeneous mixture?

• Homogeneous mixtures are always liquids, while heterogeneous mixtures are always solids.

• Homogeneous mixtures have components that are uniformly distributed, while heterogeneous mixtures do not.

• Heterogeneous mixtures can only be separated by physical means.

• Homogeneous mixtures cannot be separated into their components.

Which of the following is an example of a chemical change?

• Dissolving salt in water

• Boiling water

• Rusting of iron

• Melting of ice

What is the term used to describe a substance made of two or more elements that are chemically combined in a fixed ratio?

• Mixture

• Solution

• Compound

• Suspension