Chapter 15: Classification of Matter

Which of the following is an example of physical weathering?

• acid rain corroding a statue

• formation of stalactites in a cave

• change of calcium carbonate in limestone to calcium hydrogen carbonate

• formation of a canyon by a flowing stream

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NGSS.MS-ESS2-2

Which element makes up about 27 percent of Earth's crust?

• calcium (Ca)

• iron (Fe)

• silicon (Si)

• oxygen (O)

Which of the following is a physical property?

• flammability

• magnetic attraction

• changes when exposed to light

• ability to rust

A(n) _________ is a substance in which all the atoms in it are alike.

• mixture

• compound

• solution

• element

Which of the following statements about elements is true?

• an element is composed of two or more different substances

• all known elements are naturally occurring

• zinc, copper, and iron are elements

• there are about 150 known elements

Which of these is a homogeneous mixture?

• milk

• tea

• sand on a beach

• sodium chloride

A substance is ___________.

• either an element or a compound

• always an element

• a mixture of compounds

• always a compound

A change in size, shape, or state of matter is a _________.

• chemical property

• physical change

• physical property

• chemical change

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NGSS.MS-PS1-4

Based on the law of conservation of mass, which of these is a true statement?

• The mass of the products is always greater than the mass of the materials which react in a chemical change.

• The mass of the products is always less than the mass of the materials which react in a chemical change.

• Matter is neither lost nor gained during a chemical change.

• A certain mass of material must be present for a reaction to occur.

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NGSS.MS-PS1-5

Which of the following is a solution?

• muddy water

• milk

• salt water

• chlorine