Chemistry vocab

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Chemistry

7th

34 Terms

1

Atom

Basic unit of matter

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2

strong force

what holds the nucleus together

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3

protons

positive charged subatomic particles

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4

Neutrons

neutrally charges subatomic particles

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5

Electrons

negatively charged subatomic particles

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6

Nucleus

the center of an atom that holds protons and neutrons

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7

Electron cloud

Multiple layers that contain the electrons

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8

Atomic number

number of protons in an element

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9

Atomic mass

rounded number of protons and neutrons

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10

valence

outer shell of the electron cloud

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11

Ion

atom or molecule that has a charge

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12

Isotope

atoms of the same element that have a different number of neutrons

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13

particles

chemically unique atoms and molecules

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14

a mixture

different atoms or molecules in the same space that are not chemically bonded together

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15

pure substance

has all the same atoms or all the same molecules

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16

Molecule

two or more atoms that conjoin chemically, bond

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17

compound

two molecules that contain at least two different elements

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18

Element

pure chemical substances that can not be broken down into other substances

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19

Stable elements

Noble gasses

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20

order of the rings in the electron cloud

2 8 8

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21

The law of conservation of mass

Matter cant be created or broken apart

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22

Matter

anything that occupies space and has mass

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23

Chemical changes

Changes that create a new substance and chemical bonds are created/destroyed

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24

Physical change

changes in appearance, but a new substance is not created and chemical bonds are not created/destroyed

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25

Indicators of chemical changes

Burning/fire, explosions, color change, odor change, bubbles/fizz, and temperature without heating/cooling

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26

phase changes

when matter changes from one state to another

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27

NaHCO3

sodium bicarbonate (baking soda)- sodium, hydrogen, carbon, oxygen 3

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28

CH3COOH

Acetic Acid (vinegar)-carbon, hydrogen 3, carbon, oxygen, oxygen, hydrogen

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29

CO2

Carbon Dioxide- carbon, oxygen 2

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30

H2O

Dihydrogen Monoxide (water)-Hydrogen 2, oxygen

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31

CH3COONa

Sodium Acetate- carbon, hydrogen 3, carbon, oxygen, oxygen, sodium

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32

relationship between compounds and molecules

All compounds are molecules but all molecules are not compounds

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33

Conserved mass

there are the same number of atoms of elements before and after the reaction

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34

What indicates bonding?

When different symbols have no spaces in between

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