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Flashcards in Science Chapter 5 Vocab Deck (20)
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Physical Change

A change that alters the form or appearance of a material but does not make the material into another substance.

1

Chemical change

A change in which one or more substances combine or break apart to form new substances.

2

Reactants

A substance that enters into a chemical reaction.

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Products

A substance formed as a result of a chemical reaction.

4

Precipitate

A solid that forms from a solution during a chemical reaction.

5

Exothermic reaction

A reaction that releases energy, usually in the form of heat.

6

Endothermic reaction

A reaction that absorbs energy.

7

Chemical equation

A short, easy way to show a chemical reaction, using symbols.

8

Law of conservation of mass

The principle that the total amount of matter is neither created nor destroyed during any chemical or physical change.

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Open system

A system in which matter can enter from or escape to the surroundings.

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Closed system

A system in which no matter is allowed to enter or leave.

11

Coefficient

A number in front of a chemical formula in an equation that indicates how many molecules or atoms of each reactant and product are involved in a reaction.

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Synthesis

A chemical reaction in which two or more simple substances combine to form a new, more complex substance.

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Decomposition

A chemical reaction that breaks down compounds into simpler products.

14

Replacement

A reaction in which one element replaces another in a compound or when two elements in different compounds trade places.

15

Activation energy

The minimum amount of energy needed to start a chemical reaction.

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Concentration

The amount of one material in a certain volume of another material.

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Catalyst

A material that increases the rate of a reaction by lowering the activation energy.

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Enzymes

A biological catalyst that lowers the activation energy of reactions in cells

19

Inhibitor

A material that decreases the rate of a reaction.