SCIENCE TRIMESTER 1

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52 Terms

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Matter

Anything that has mass and takes up space.

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Chemistry

The study of matter and how it changes.

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Substance

A single kind of matter that always has a specific makeup or composition.

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Physical Property

A characteristic that can be observed without changing the matter into another type of matter.

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Chemical Property

A characteristic that describes something's ability to become something else.

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Atom

The basic unit from which all matter is made.

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Chemical Bond

A force of attraction between two or more atoms.

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Molecule

A group of two or more atoms held together by chemical bonds.

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Compound

A substance made of two or more elements that are chemically combined in a set ratio.

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Mixture

Two or more substances that are together in the same place, but their atoms are not chemically bonded.

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Homogeneous Mixture

A mixture where it is difficult or impossible to see the different parts.

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Heterogeneous Mixture

Substances that are mixed together but not chemically bonded to each other.

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Mass

The amount of matter in an object.

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Volume

The amount of space that matter occupies.

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Weight

A measure of the force of gravity on an object.

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Density

A measure of the mass of a material in a given volume.

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Physical Change

Alters the form or appearance of matter but does not turn any substance into a different substance.

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Chemical Change

Produces one or more new substances.

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Law of Conservation of Matter

Matter is not created nor destroyed in any chemical or physical change.

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Energy

The ability to do work or cause change.

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Thermal Energy

The total energy of the motion of all particles in an object.

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Endothermic Change

Occurs when energy is absorbed.

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Exothermic Change

Occurs when energy is released.

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Solid

Has a definite shape and volume.

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Liquid

Has a definite volume but no definite shape.

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Gas

Has neither a definite volume nor a definite shape.

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Potential Energy

Energy stored in an object due to its position or condition.

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Kinetic Energy

Energy an object has because of its motion.

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Electrical Energy

Generated by the movement of electrons.

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Motion Energy

Energy stored in moving objects.

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Elastic Energy

Energy stored in an object due to a force that temporarily changes its shape.

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Melting Point

The temperature at which a substance changes from a solid to a liquid.

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Freezing Point

The temperature at which a liquid freezes.

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Vaporization

The change of state from a liquid to a gas.

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Boiling Point

The temperature at which a liquid boils.

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Evaporation

The process by which molecules at the surface of a liquid change to a gas.

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Condensation

The change in state from a gas to a liquid.

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Sublimation

The change in state from a solid directly to a gas without passing through the liquid state.

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Pressure

The force applied over an area.

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Charles's Law

Describes the relationship between the temperature and volume of a gas at constant pressure.

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Boyle's Law

Describes the relationship between the pressure and volume of a gas at constant temperature.

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Energy

The ability to do work or cause change.

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Motion

The state in which one object's distance from another is changing.

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Force

A push or pull exerted on an object.

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Work

Force exerted on an object that causes it to move.

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Energy

Measured in joules, the same units as work.

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Power

The rate at which one form of energy is transformed into another.

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Work

The amount of energy transferred when a force is applied to move an object.

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Watt

The SI unit of power, equal to 1 joule per second.

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Calculating Power

Determined by how much and how quickly work is being done.

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Power Formula

Power = Work/Time or Power = Force x Distance (depending on the question).

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Power and Energy

Power is the rate at which energy is transferred or the amount of energy transferred in a unit of time.