Module 4: Classifying Matter and Its Changes

question

Substance that contains

only one element or compound (99)

answer

Pure substance
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Substance that contains different compounds and/or elements (99)
answer

Mixture
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Mixture with a composition

that is always the same

no matter what part of the sample

you are observing (103)

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Homogeneous mixture
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Mixture with a

composition that is different

depending on what part of the sample

you are observing (103)

answer

Heterogeneous mixture
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A change that affects

the type of molecules or atoms

in a substance (106)

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Chemical change
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A change in which

the atoms or molecules in a substance

stay the same (106)

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Physical change
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Process by which

a substance changes from one phase

(solid, liquid, or gas)

to another phase (109)

answer

Phase change
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Process by which

a substance changes from its solid phase

to its liquid phase (112)

answer

Melting
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Process by which

a substance changes from its liquid phase

to its solid phase (109)

answer

Freezing
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Process by which

a substance changes from its liquid phase

to its gas phase (109)

answer

Boiling
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Process by which

a substance changes from its gas phase

to its liquid phase (109)

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Condensing
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One of three states of matter: 

solid, liquid, or gas (109)

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Phase
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Theory that the atoms or molecules

which make up a substance

are in constant motion,

and the higher the temperature,

the greater their speed. (111)

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Kinetic Theory of Matter
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Temperature at which

a substance changes from its solid phase

to its liquid phase (112)

answer

Melting point
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Temperature at which

a substance goes from its liquid phase

to its gas phase. (112)

answer

Boiling point
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Process by which

one or more substances change

into one or more different substances (115)

answer

Chemical reaction
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A representation

of a chemical reaction (115)

answer

Chemical equation
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A molecule composed of

two identical atoms (115)

answer

Homonuclear diatomic
question

Nitrogen, oxygen, chlorine, and fluorine are 4 of the 8 homonuclear diatomics.  Name the other 4.
answer

bromine, iodine, astatine, hydrogen
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Bromine, iodine, astatine, and hydrogen are 4 of the 8 homonuclear diatomics.  Name the other 4.
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Nitrogen, oxygen, chlorine, fluorine.
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Why are the folowing elements significant?

N2, O2, Cl2, F2, Br2, I2, At2, H2.

(115)

answer

They are not composed of individual atoms; they are homonuclear diatomics.
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Substances found on the right side of a chemical equation (116)
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