Man has been classifying things since the beginning of _______.

Chemists classify elements as metals, nonmetals, and metalloids, as well as into families, such as alkaline earth _______ or halogens.

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

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

We _______ matter according to its properties.

A compound is a pure substance consisting of atoms of two or more _______ elements that are chemically combined.

Atoms of a particular compound always combine in the same _______.

Elements are the simplest of the ______ substances.

Anything that is not a pure substance is a mixture—a ________ combination of two or more substances.

Another term for homogeneous mixture is a _______.

A heterogeneous mixture does not have a ________ appearance since the substances are unevenly distributed.

An element is a pure substance that consists of atoms with the same ______ number.

What is the best choice here that defines a salad?

All 118 known elements are listed on the _______ table of the elements.

The particle model states that all matter consists of tiny particles in constant _______ motion.

PLASMA: gas-like state of matter formed at very high ________that consists of high-energy ions and free electrons.

In a ________ substance the particles vibrate in place.

LIQUID: Particle spacing: ______ Particle motion: able to slide past each other Volume: fixed Shape: changes to fill a container from the bottom.

The states of matter are determined by the relationship between the kinetic energy (energy of motion) of the particles and the _______forces between them.

_________: The attractive forces between the liquid particles, a measure of a fluid's resistance to flow. In other words, how “thick” or “thin” is the liquid?

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