Intro to Chem & Props of Matter Vocabulary

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27 terms

chemistry

the study of matter and how it changes

solids

molecules are tightly packed, have a definite shape and volume, cannot be compressed, and only vibrate a little

liquids

molecules are loosely packed, have a definite volume but do not have a definite shape, cannot be compressed, and move somewhat

fluid

a substance that flows (includes liquids AND gases)

gases

molecules are very far apart, have no definite shape or volume, can be compressed, and move very fast

colloids

substances with some characteristics of solids and some of liquids

volume

the amount of space something takes up

temperature

the average amount of energy a substance has

physical changes

changes the form of the substance but not its identity

melting

solid to a liquid by adding heat

freezing

liquid to a solid by taking away heat

vaporizing

liquid to a gas by adding heat

evaporation

vaporizing that takes place on just the surface of the liquid

boiling

vaporizing that takes place throughout the liquid

condensing

gas to a liquid by taking away heat (fog on a mirror, "sweat" on a cold can of pop)

subliming

solid to a gas or gas to a solid (no liquid phase in between)

physical property

a property that can be observed WITHOUT changing it into another substance

chemical property

a property of a pure substance that describes its ability to CHANGE into different substances

flammability

chemical property that describes how easily something catches fire and burns

pH

chemical property that describes how acidic or basic (alkali) a substance is

solubility

physical property that describes how easily something will dissolve in water

state of matter

physical property that describes whether something is a solid, liquid, or gas

texture

physical property that describes the feel of something

reactivity

chemical property that describes how easily a substance will react with another substance, ie. baking soda reacting with vinegar

base (alkali)

substance that has a pH higher than 7 on the pH scale

acid

substance that has a pH lower than 7 on the pH scale

neutral

substance that has a pH of 7

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