7th Grade Chemistry Review

Which of the following is NOT true about the periodic table?

• Atomic mass is equal to the number of neutrons.

• Elements listed by their (increasing) atomic mass.

• Groups are the elements listed in columns.

• Periods are the elements listed in rows of 8 (for most rows).

Chemical properties are

• an element’s ability to react with other elements.

• an element's ability to change into a gas.

• an elements attraction to water.

• any property which can be observed or measured.

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A physical reaction is a chemical reaction which

• changes the physical properties of the elements.

• changes the chemical properties of an element.

• separates atoms in a mixture.

• combines atoms in a mixture.

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Which of the following are true about gas molecules? Choose two.

• the particles move about quickly

• the particles are far apart

• the particles move slowly and vibrate in place

• the particles are close together

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Which of the following are true about the molecules in liquids? Choose two.

• The particles slip easily over and around each other

• Will take the shape of its container

• The particles move slowly and vibrate in place

• The particles have a definite shape

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Which of the following are true about solids? Choose two.

• The particles vibrate in place

• Have a definite shape

• The particles move quickly and freely

• The particles take the shape of their container

Somethings ability to dissolve, or mix completely with a liquid, is

• solubility.

• boiling point.

• freezing point.

• density.

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Which of the following is an example of something dissolving?

• Mixing sugar, lemon juice, and water for lemonade.

• Mixing sand and gravel for the substrate of a fish tank.

• Mixing oil and vinegar for salad dressing.

• Mixing cereals and nuts for a snack mix.

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Materials boil at different temperatures, the specific temperature a material has to reach in order to boil is called the materials

• boiling point.

• freezing point.

• melting point.

• solidification point.

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Which of the following is a compound containing more than one element?

• NaCl

• Be

• S

• Ne

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