Chemistry-Unit 1

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Atom

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44 Terms

1

Atom

Smallest piece of an element

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2

Element

Substance made of 1 type of atom. Listed on the Periodic Table

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3

Compound

Substance made of 2 or more elements chemically joined

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4

Pure

Substance made of 1 type of particle

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5

Mixture

Two or more different particles not chemically joined in a space e.g salt water, air

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6

Molecule

Particle made of more than one atom chemically joined. The elements are usually non-metals. There are weak forces of attraction between molecules.

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7

Particles

General name for any small piece of matter. Can be atoms or molecules (or ions).

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8

Periodic Table

List of all known elements with their symbols.

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9

Formula

How chemists show the combination of elements in a particle e.g CuSO4 or Na

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10

NO3

nitrate

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11

SO4

sulfate

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12

What is in an atoms core?

protons, neutrons

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13

proton charge and atomic mass

+,1

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14

neutron charge and atomic mass

no charge,1

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15

electron charge and atomic mass

-,0

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16

What is the electron filling rule?

2,8,8,7

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17

What is an ion?

An ion is formed when an atom gains or loses an electron

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18

An ion is negatively charged if

it gains an element

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19

An ion is positively charged if

it loses an electron

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20

Physical change

Particles are rearranged but no new particles are made e.g melting, dissolving

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21

Chemical Reaction

atoms in particles rearrange to form new particles

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22

Signs of a chemical reaction

Gas produced, colour changing, temperature change, reactants used up, new substance appears

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23

Signs of physical changes

Produced gas (if boiling or evaporating), temporary colour change, temperature change, change of state

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24

Solute

The substance that dissolves

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25

Solvent

The substance the solute dissolves in

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26

Soluble

Something can be dissolved

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27

Insoluble

Cannot be dissolved

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28

Solution

The mixture of the solvent and the solute

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29

Diffusing

The gradient of a substance through air or water from high concentration to low concentration

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30

Solubility

The maximum amount that can be dissolved in a solvent at a particular temperature

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31

t or f, if you dissolve 40cm3 of salt in 50cm3 of water the volume will be 90cm3

true

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32

t or f, if you dissolve 1g of salt in 200g water the mass will be 200g

false

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33

independent variable

what changes

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34

dependent variable

what you measure

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35

control variable

doesn’t change

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36

Signs of evaporation

Happens at any temperature, only on the surface of a liquid, no bubbles, slow process, cools down a liquid

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37

Signs of Boiling

Happens at a specific temperature, can happen throughout the substance, bubbles of gas are seen, quick process, constant temperature

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38

Why does evaporation happen?

knowt flashcard image
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39

Is evaporation faster at higher temperatures?

Yes

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40

t or f evaporation takes place in all of these places: sea, lake, plants, ground

true

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41

In the water system how does water change?

Evaporation and condensation

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42

In the water system where is water stored?

ocean/sea, lake, river, stream, groundwater

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43

In the water system where does water move?

rivers and streams (watershed), surface run off, percolation through soil and rocks, ground water

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44

saturated solution

a solution where no more solute can dissolve

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