Classification provides a structure within which we can conduct a ________ study.

We classify matter according to its ______________.

These properties of matter can be physical, ________, or nuclear.

A pure substance is a material made of only one kind of _________ or compound; it is not a mixture.

An element is a pure substance that consists of atoms with the same atomic _______.

_______ are the simplest of the pure substances.

The element mercury is a _______ containing only atoms.

A compound is a pure substance consisting of atoms of ______ or more different elements that are ________ combined.

Atoms of a particular compound ________ combine in the same proportion.

Table salt (sodium chloride, NaCl) is a crystalline compound made of _________ bonded with chlorine.

Anything that is not a pure substance is a (an) _______—a physical combination of two or more substances.

he two key aspects of mixtures are (1) that they are only physically combined, not chemically, and (2) that the proportion of substances within the mixture is ________.

A __________ mixture does not have a uniform appearance since the substances are unevenly distributed.

A chocolate chip cookie is a ______ mixture because the chocolate is not _______ distributed throughout the cookie.

When different substances are mixed so that they have a uniform appearance throughout, a ________ mixture results.

Another term for homogeneous mixture is ___________.

_________ is a homogeneous mixture.

The four most common states of matter are solid, liquid, gas (or vapor), and _______.

Scientists will often refer to the different states as _______.

The _________ model states that all matter consists of tiny particles in constant random _______.

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