Unit 3 Chemistry

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15 Terms

1
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chemical change

A change in matter that produces one or more new substances

<p>A change in matter that produces one or more new substances</p>
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chemical property

A characteristic of a substance that can only be observed during a chemical reaction.

<p>A characteristic of a substance that can only be observed during a chemical reaction.</p>
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reactants

The substance that enter into a chemical reaction

<p>The substance that enter into a chemical reaction</p>
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products

A substance formed as a result of a chemical reaction.

<p>A substance formed as a result of a chemical reaction.</p>
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exothermic reaction

A reaction that releases energy in the form of heat (new substance feels warmer)

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endothermic reaction

A reaction in which energy is absorbed (new substance feels colder)

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closed system

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

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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>
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chemical bond

the force that holds two atoms together

<p>the force that holds two atoms together</p>
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valence electrons

Electrons on the outermost energy level of an atom

<p>Electrons on the outermost energy level of an atom</p>
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octet rule

States that atoms lose, gain or share electrons in order to acquire a full set of eight valence electrons

<p>States that atoms lose, gain or share electrons in order to acquire a full set of eight valence electrons</p>
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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>
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oxidation

A chemical change in which a substance combines with oxygen, as when iron oxidizes, forming rust

<p>A chemical change in which a substance combines with oxygen, as when iron oxidizes, forming rust</p>
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flammable

A chemical property of matter

<p>A chemical property of matter</p>
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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>