Unit 1 - Chemical Reactions and Matter

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Observation

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Using our 5 senses to observe or study an object.

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Physical Properties

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A characteristic of a substance that doesn't change (mass, volume, odor, color, melting point).

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Matter

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Anything that has mass and takes up space.

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Solid

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A state of matter that has a definite mass, volume and keeps its shape. Particles are tightly packed together, vibrate in place, and have the least energy.

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Liquid

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A state of matter that has mass and volume, but takes the shape of its container. Particles have more energy than a solid and are able to flow past each other.

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Gas

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A state of matter in which particles are far apart, has mass, takes up space; no definite shape or volume. Gases have the most energy.

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States of Matter

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One of the distinct forms in which matter can exist (solid, liquid, gas).

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Mass

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The amount of matter in an object.

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Volume

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The amount of space an object takes up.

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Closed System

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No matter enters or escapes.