VOCAB

Chemistry

The study of matter and the changes it undergoes.

Scientific Method

A systematic approach to research.

Qulitative

Consisting of general observations about the system.

Quantitative

Comprising numbers obtained by various measurements of the system.

Hypothesis

A tentative explanation for a set of observations.

Law

statement or mathematical expression that reliably describes a behavior of the natural world.

A concise verbal or mathematical statement of a relationship between phenomena that is always the same under the same conditions.

Theory

A unifying principle that explains a body of facts and the laws that are based on them.

an attempt to explain the cause of certain events in the natural world.

Macroscopic properties

Properties that can be measured directly.

Microscopic properties

Properties that cannot be measured directly without the aid of a microscope or other special instrument.

International System of Units (SI)

A system of units based on metric units.

weight

The force that gravity exerts on an object

liter

The volume occupied by one cubic decimeter.

Kelvin

The SI base unit of temperature, the absolute temperature scale

Substance

A form of matter that has a definite or constant composition (the number and type of basic units present) and distinct properties.

Mixture

A combination of two or more substances in which the substances retain their identity.

Homogeneous mixture

the composition of a mixture, after sufficient stirring, is the same throughout the solution

Heterogeneous mixture

the individual components of a mixture remain physically seperated and can be seen as seperate components

Element

A substance that cannot be separated into simpler substances by chemical means.

Compound

A substance composed of atoms of two or more elements chemically united in fixed proportions.

Physical Property

Any property of a substance that can be observed without transforming the substance into some other substance.

Chemical property

Any property of a substance that cannot be studied without converting the substance into some other substance.

Extensive property

A property that depends on how much matter is being considered.

mass

a measure of the quantity of matter contained in an object

Volume

it is the length cubed

Intensive property

A property that does not depend on how much matter is being considered.

Density

the mass of a substance divided by its volume