8.P.1 (Chemistry) Review

Which best represents a compound?

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NGSS.MS-PS1-1

Which best compares a homogeneous mixture and a heterogeneous mixture?

• Homogeneous mixtures are formed through physical changes, while heterogeneous mixtures are formed through chemical changes.

• Homogeneous mixtures are composed of two different liquids, while heterogeneous mixtures are composed of a solid and a liquid.

• The particles in a homogeneous mixture will separate if left undisturbed, while the particles in a heterogeneous mixture cannot be filtered out of the mixture.

• A homogenous mixture is the same throughout, while a heterogeneous mixture is not uniform throughout.

Which is an example of a compound?

• O₂

• 2Cl

• H₂SO₄

• Hydrogen

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NGSS.MS-PS1-1

Which pair of elements has the most similar properties?

• Li and B

• I and Ca

• K and He

• N and P

Why are the noble gases such as helium (He) and neon (Ne) grouped together in the periodic table?

• They are nonreactive gases.

• They are highly reactive metallic solids.

• They are dangerous gases when combined with water.

• They are liquid at room temperature and have high boiling points.

What category of elements is found between the metals and nonmetals on the periodic table?

• synthetic

• metalloids

• radioactive

• noble gases

Properties such as magnetism, luster (shine), and malleability have been used to group together which category of elements on the periodic table?

• metals

• nonmetals

• metalloids

• noble gases

What happens to water molecules during the boiling process?

• They move faster and move farther apart as they absorb heat.

• They move faster and remain close together as they absorb heat.

• They move more slowly but move farther apart as they lose heat.

• They move faster and move farther apart as they lose heat.

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NGSS.MS-PS1-4

NGSS.MS-PS3-4

Which shows one example of a physical change and one example of a chemical change?

• boiling water and melting wax

• rusting iron and baking a cake

• dissolving powder and shredding paper

• freezing water and burning coal

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NGSS.MS-PS1-2

Which is the best evidence that the creation of a precipitate is the result of a chemical reaction?

• demonstrates gas production

• demonstrates a temperature change

• demonstrates a new substance has formed

• None of the above provide evidence of a chemical change.

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NGSS.MS-PS1-2