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Chapter 7 Vocab (PS)

Across
A system in which matter can enter from or escape to the surroundings
A chemical reaction that breaks down compounds into simple products
A substance that enters into a chemical reaction
The amount of one material in a certain volume of another material
A reaction that releases energy, usually in the form of heat
The principal that the total amount of matter is neither created or destroyed during any physical or chemical change
A short, easy way to show chemical reactions, using symbols
A change in which one or more substances combine or break apart to form new substances
A solid that forms from a solution during a chemical reaction
A number in front of a chemical equation that indicates how many molecules or atoms of each reactant and product are involved in a reaction
Down
A chemical reaction in which two or more simple substances combine to form a new, more complex substance
A reaction in which one element replaces another in a compound or when two elements in different compounds trade places
A substance formed as a result of a chemical reaction
A reaction that absorbs energy
The minimum amount of energy needed to start a chemical reaction
A change that alters the form or appearance of a material but does not make the material into another substance.
A system in which no matter is allowed to enter or leave
A material that increases the rate of a reaction by lowering the activation energy
1. a type of protein that speeds up a chemical reaction in a living thing 2. a biological catalyst that lowers the activation energy of reactions in cells