Atoms and Molecules--20 terms

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20 Terms

1
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An atom

the building block of all matter

2
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A molecule

a group of two or more atoms that bond together

3
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An element

a substance made of a single type of atom

4
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A compound

two or more atoms of different elements joined together

5
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Matter

anything that takes up space and has mass: water, plants, animals, sand, clouds

6
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Substance

a physical material from which things are made

7
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Phases of matter

solid, liquid, gas

8
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Evaporation

when liquid turn into a gas

<p>when liquid turn into a gas</p>
9
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Melting

when solid turns into a liquid

<p>when solid turns into a liquid</p>
10
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Freezing

when liquid turns into a solid

<p>when liquid turns into a solid</p>
11
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Condensation

when gas turns into a liquid

<p>when gas turns into a liquid</p>
12
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Table Salt

NaCl (Sodium Chloride)

<p>NaCl (Sodium Chloride)</p>
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Water

H2O (Dihydrogen Monoxide)

<p>H2O (Dihydrogen Monoxide)</p>
14
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Sodium

Na

<p>Na</p>
15
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Chlorine

Cl

<p>Cl</p>
16
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Hydrogen

H

<p>H</p>
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Oxygen

O

<p>O</p>
18
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Ion

An atom or group of atoms that has a positive or negative charge. Because it gains or loses electrons

19
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artificial

Made by human beings and not by nature

20
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Chemical formula

shows the elements in the compound and the numbers each kind of atoms