Chemistry Quarter 1 test

Homogeneous

The composition is the same throughout

Heterogeneous

The composition is not the same throughout

Atom

The smallest particle of an element that still has the element’s properties

Molecule

The smallest particle of a covalent compounds that still has the properties of the compound

Element

The simplest form of matter that has a unique set of properties

Compound

A substance that contains two or more elements chemically combined in a fixed proportion

Mixture

A physical blend of two or more compounds, each of which retains their own identity and properties

Substance

Matter that has a uniform and definite composition

Mass

The amount of matter present in an object

Volume

The space matter combines

Temperature

A measure of the average kinetic energy

Density

The amount of mass per unit volume

Intensive property

A property that does not depend on the amount of matter present

Extensive property

A property that does depend on the amount of matter present

Identifying property

A specific characteristic of a substance, whether physical or chemical, that allowed one to distinguish it from other substances

Accuracy

How close a measurement is to an accepted value

Precision

How close to a set of measurements are to each other

Metal

Material that is conductive, malleable, ductile, and has luster

Metalloids

Materials that have properties of both metals and nonmetals. Many are semiconductors

Nonmetals

Materials that tend to be brittle, nonconductive, and dull

Group

One of eight columns on the periodic table. First 2 and last 6

Family

One of eight columns on the periodic table. First 2 and last 6

Period

A row on the periodic table

Series

A row on the periodic table

Chemical reaction

Chemical combining, breaking apart, or rearranging. A new substance is formed

Chemical properties

Properties of matter that can only be determined by carrying out a chemical reaction

Physical properties

Properties of matter that can be determined without carrying out a chemical reaction

Reactants

The chemicals that are going to react and are on the left side of a chemical reaction

Products

The chemicals that are produced in a chemical reaction and are on the right side of a chemical reactions

Malleable

Materials that can be pound into a very thin sheet

Conductivity

How easily electrons or heat flow through a substance

Luster

Shininess

Ductile

Ability to be drawn into a wire

Solid

Matter that has a definite volume or shape

Liquid

Matter that has a definite volume and an indefinite shape

Gas

Matter that has an indefinite volume and an indefinite shape

Metals, nonmetals, and metalloids on periodic table

Metric conversions

Mole

6.02×10²³

Why is a mole a mole?

It is the exact amount of atoms in 12 grams of C-12. C-12 is the most abundant of the two stable isotopes of carbon