8th Grade Unit 2 Test Review: Matter

If it is determined that the particles in one solid are arranged in a repeating pattern and the particles in another solid are arranged randomly, what must be true about the solids?

• They are different substances.

• They have the same weight.

• They have the same densities.

• They are different mixtures.

An element is identified by

• its number of protons

• the atomic mass

• the type of charge

• its number of isotopes

Which is true about a compound?

• It is made up of one type of atom.

• It can be formed through a physical reaction.

• It can be changed into simpler substances through a physical change.

• It is a pure substance containing elements that are chemically combined.

Which of the following types of mixtures have solutes that cannot be dissolved in the solvent and the solutes just stay at the bottom of the solvent?

• solution

• colloid

• suspension

• homogenous

Which of the following group matter contains all pure substances?

• iron fillings, limestone, pure water

• laundry detergent, syrup, orange juice

• aluminum, magnesium, air

• acetylene, tap water, soil

Which of the following group matter contains all mixtures?

• Pacific Ocean, air, soil

• Chromium, baking soda, salt

• brass, pizza, benzene

• pure water, tap water, muddy water

Which of the following is classified as a compound?

• Aluminum (Al)

• Magnesium (Mg)

• Water (H2O)

• Chromium (Cr)

Which of the following method will you use to separate sugar from syrup?

• evaporation

• condensation

• filtration

• magnetism

Which of the following state of matter has the least amount of energy in the molecules?

• liquid

• solid

• gas

• plasma

Water is different from other substances because

• It is more dense as a solid than as a liquid.

• It is less dense as a solid than as a liquid

• It is more dense as a gas than as a liquid.

• It is less dense as a solid than as a gas.