Unit 3: Chemical Reactions

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24 Terms

1

chemical equation

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

<p>A representation of a chemical reaction that uses symbols to show the relationship between the reactants and the products</p>
2

chemical reaction

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

<p>the process by which one or more substances change to produce one or more different substances</p>
3

endothermic reaction

A reaction that ABSORBS energy in the form of heat

<p>A reaction that ABSORBS energy in the form of heat</p>
4

exothermic reaction

A reaction that releases energy in the form of heat

<p>A reaction that releases energy in the form of heat</p>
5

Matter

Anything that has mass and takes up space

<p>Anything that has mass and takes up space</p>
6

Mass

the amount of matter in an object

<p>the amount of matter in an object</p>
7

Reactant

A chemical substance that is present at the start of a chemical reaction

<p>A chemical substance that is present at the start of a chemical reaction</p>
8

product

A substance produced in a chemical reaction

<p>A substance produced in a chemical reaction</p>
9

precipitate

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

<p>A solid that forms from a solution during a chemical reaction.</p>
10

Law of Conservation of Mass

the law that states that mass cannot be created or destroyed in ordinary chemical and physical changes

<p>the law that states that mass cannot be created or destroyed in ordinary chemical and physical changes</p>
11

Law of Conservation of Matter

Matter is not created nor destroyed in any chemical or physical change

<p>Matter is not created nor destroyed in any chemical or physical change</p>
12

single replacement/ displacement reaction

a chemical change in which one element replaces a second element in a compound; AB + C = AC + B

<p>a chemical change in which one element replaces a second element in a compound; AB + C = AC + B</p>
13

double replacement/ displacement reaction

a chemical change involving an exchange of positive ions between two compounds; AB + CD = AC + BD

<p>a chemical change involving an exchange of positive ions between two compounds; AB + CD = AC + BD</p>
14

synthesis reaction

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

<p>a reaction in which two or more substances combine to form a new compound</p>
15

decomposition

A chemical reaction that breaks down compounds into simpler products.

<p>A chemical reaction that breaks down compounds into simpler products.</p>
16

combustion

A rapid reaction between oxygen and fuel that results in fire

<p>A rapid reaction between oxygen and fuel that results in fire</p>
17

chemical formula

A combination of chemical symbols and numbers to represent a substance

<p>A combination of chemical symbols and numbers to represent a substance</p>
18

chemical name

The name that describes the chemical composition and molecular structure of a compound.

<p>The name that describes the chemical composition and molecular structure of a compound.</p>
19

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.

<p>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.</p>
20

corrosive

eating away gradually

<p>eating away gradually</p>
21

Subscript

A number in a chemical formula that tells the number of atoms in a molecule or the ratio of elements in a compound

<p>A number in a chemical formula that tells the number of atoms in a molecule or the ratio of elements in a compound</p>
22

Compound

two or more different atoms bonded together to make a molecule

<p>two or more different atoms bonded together to make a molecule</p>
23

diatomic molecule

A molecule consisting of two atoms

<p>A molecule consisting of two atoms</p>
24

Molecule

A group of atoms bonded together

<p>A group of atoms bonded together</p>