Science 8, Test, Chapter 2 Flashcards Preview

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Flashcards in Science 8, Test, Chapter 2 Deck (23):
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What is Chemical Reaction?

the process by which on or more substances change to produce one or more different substances

1

What is a Synthesis Reaction?

a reaction in which two or more substances combine to form a new substance

2

What is a Decomposition Reaction?

a reaction in which a single compound breaks down to form two or more simpler substances

3

What is a Single-displacement Reaction?

a reaction in which one element or radical takes the place of another element or radical in a compound

4

What is a Double-displacement Reaction

a reaction in which a gas, a solid precipitate, or a molecular compound forms from the exchange of ions between the two compounds

5

What is an Exothermic Reaction?

a reaction in which heat is released to the surroundings

6

What is a Endothermic Reaction?

a chemical reaction that requires heat

7

What is the Law of Conservation of Energy?

the law that states that energy cannot be created nor destroyed but can be changed from one form to another

8

What is Activation Energy?

the minimum amount of energy requires to start a chemical reaction

9

What is an Inhibitor?

a substance that slows down or stops a chemical reaction

10

What is a Catalyst?

a substance that changes the rate of a chemical reaction without being used up or changed very much

11

What is a Precipitate?

a solid that is produced as a result of a chemical reaction in solution

12

What is a Chemical Formula?

a combination of chemical symbols and numbers to represent a substance

13

What is a Chemical Equation?

a representation of a chemical reaction that uses symbols to sow the relationship between the reactants and the products

14

What is a Reactant?

a substance or molecule that participates in a chemical reaction

15

What is a Product?

the substance that forms in a chemical reaction

16

What is Activation Energy?

the minimum amount of energy needed to start a chemical reaction

17

What is the Law of Conservation of Mass?

the law that states that mass cannot the created or destroyed but in ordinary chemical and physical change

18

What is the prefix for 1 atom?

mono-

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What is the prefix for 2 atoms?

-di

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What is the prefix for 3 atoms?

-tri

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What is the prefix for 4 atoms?

tetra-

22

Why do chemical equations have to be balanced?

Chemical equations must be balanced because the Law of Conservation of Mass that mass cannot be created or destroyed.