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Flashcards in unit 3 test Deck (24)
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1

chemical change

any change in. which a new substance is formed

2

kinetic molecular theory

a theory stating that all matter is a measure of particles is continuous random motion; temperature is a measure of the average speed of the particles

3

collision-react theory

theory stating that chemical reactions involve collisions and rearrangements of atoms or groups of atoms and that outcomes of collisions depend on the energy and orientation of the collisions

4

word equation

a representation of a chemical reaction using only the names of the chemicals involved

5

chemical equation

a representation of a chemical reaction that indicates the chemical formulas, relative number of entities, and states of matter of the reactant products

6

coefficient

a whole number indicating the ratio of molecules of each substance involved in a chemical reaction

7

catalytic converter

a device that uses catalysts to convert pollutant molecules in vehicle exhaust to less harmful molecules

8

catalyst

a substance that speeds up the rate of a reaction without undergoing any chemical change itself

9

combustion reaction

the reaction of a substance with oxygen, producing oxides and energy

10

greenhouse effect

a theory stating that heat is trapped near Earth's surface by carbon dioxide gas, atmospheric water vapour and sone other gases

11

synthesis reaction

a chemical reaction in which two or more simple substances combine to form a more complex substance; also known as combination reaction
A + B--> AB

12

decomposition reaction

a chemical reaction in which a compound is broken down into two or more simpler substances
AB--> A + B

13

thermal decomposition

a decomposition reaction that occurs when the reactant is heated

14

single displacement reaction

the reaction of an element with a compound to produce new element and a new compound

15

activity series

a list of elements arranged in order of. their reactivity, based on empirical evidence gathered from single displacement reactions

16

alloy

a homogeneous mixture (a solution) of two or more metals

17

corrosion

the unwanted reaction of metals with chemicals in the environment

18

galvanizing

coating iron or steel with zinc to prevent rusting

19

double displacement reaction

a reaction in which aqueous ionic compounds rearrange

20

solute

a substance that is dissolved in a solvent to form a solution

21

solvent

the medium in which a solute is dissolved; often. the. liquid component of. a solution

22

solubility

a property of. a solute; the concentration of a saturated solution of a solute in a solvent at a specific temperature and pressure

23

precipitate

form a low-solubility solid from a solution; the solid formed in a chemical reaction or by decreased solubility

24

neutralization reactions

a double displacement reaction between an acid and a base to produce an ionic compound(a salt) and usually water