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Chemistry

The study of the composition, structure, properties, and reactions of matter.

Physics

The study of matter and energy and the interactions between the two thru forces and motion.

Geology

The study of the origin, history and structure of Earth.

Astronomy

The study of the universe beyond Earth.

Biology

The study of life and life processes.

Scientific Method

An organized plan used for gathering, organizing and communicating info.

Hypothesis

A proposed answer to a question

Manipulated Variable

The variable that causes a change in another variable.

Responding Variable

A variable that changes in response to a change in the manipulated variable.

Scientific Theory

A well-test explanation for a set of observations or experimental results.

Scientific Law

A statement that summarizes a pattern found in nature.

Model

A representation of an object or event.

Scientific Notation

A way of expressing a value as the product of a number between 1 and 10 and a power of 10.

Length

The straight-line distance between two points.

Mass

The amount of matter in an object.

Volume

The amount of space an object takes up.

Density

The ratio of a material's mass to its volume.

Conversion Factor

A ratio of equivalent measurements that is used to convert a quantity from one unit to another

Precision

A gauge of how exact a measurement is.

Significant Figures

All the digits in a measurement that are directly measured, plus the last digit which is estimated

Accuracy

The closeness of measurement to the true value of what is measured.

Slope

The steepness of a line, equal to the ratio of a vertical change to the corresponding horizontal change.

Direct Proportion

A relationship between two variables in which their ratio is constant.

Inverse Proportion

A relationship in which the product of two variables is a constant when all other variable are held constant.

Pure Substance

Matter that always has exactly the same composition; an element or compound.

Element

A substance that cannot be broken down into simpler substances.

Atom

The smallest particle of an element.

Compound

A substance that is made from two or more simpler substances and can be broken down into those simpler substances.

Heterogeneous Mixture

A type of mixture in which the parts of the mixture are noticeably different from one another.

Homogeneous Mixture

A type of mixture in which the substances are so evenly distributed that it is difficult to distinguish one substance in the mixture from another.

Solution

A mixture that forms when substances dissolve and form a homogeneous mixture.

Suspension

A heterogeneous mixture that separates into layers over time.

Colloid

A mixture that contains some particles that are intermediate in size between the small particles in a solution and the larger particles in suspension.

Physical Property

Any characteristic of a material that can be observed or measured without changing the composition of the substances in the material.

Viscosity

The tendency of a liquid to keep from flowing; resistance to flowing.

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