Module 4: Classifying Matter and Its Changes

Substance that contains

only one element or compound (99)

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

Mixture with a composition

that is always the same

no matter what part of the sample

you are observing (103)

Homogeneous mixture

Mixture with a

composition that is different

depending on what part of the sample

you are observing (103)

Heterogeneous mixture

A change that affects

the type of molecules or atoms

in a substance (106)

Chemical change

A change in which

the atoms or molecules in a substance

stay the same (106)

Physical change

Process by which

a substance changes from one phase

(solid, liquid, or gas)

to another phase (109)

Phase change

Process by which

a substance changes from its solid phase

to its liquid phase (112)

Melting

Process by which

a substance changes from its liquid phase

to its solid phase (109)

Freezing

Process by which

a substance changes from its liquid phase

to its gas phase (109)

Boiling

Process by which

a substance changes from its gas phase

to its liquid phase (109)

Condensing

One of three states of matter: 

solid, liquid, or gas (109)

Phase

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)

Kinetic Theory of Matter

Temperature at which

a substance changes from its solid phase

to its liquid phase (112)

Melting point

Temperature at which

a substance goes from its liquid phase

to its gas phase. (112)

Boiling point

Process by which

one or more substances change

into one or more different substances (115)

Chemical reaction

A representation

of a chemical reaction (115)

Chemical equation

A molecule composed of

two identical atoms (115)

Homonuclear diatomic
Nitrogen, oxygen, chlorine, and fluorine are 4 of the 8 homonuclear diatomics.  Name the other 4.
bromine, iodine, astatine, hydrogen
Bromine, iodine, astatine, and hydrogen are 4 of the 8 homonuclear diatomics.  Name the other 4.
Nitrogen, oxygen, chlorine, fluorine.

Why are the folowing elements significant?

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

(115)

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