# New 9th Grade Vocab Terms

### 35 terms by Buggymax

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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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