Science end of quarter 1 test!!!

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https://docs.google.com/document/d/1htl4uIkin7CTVibWXBjGZLMkDZKUBuIEM3MWIkreXw4/edit?usp=sharing (link to more balancing chemical equations practice! print out or make your own copy please!)

55 Terms

1

nucleus

middle, holds neutrons and protons

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2

electron shells

outer rings, holds electrons

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3

what charge do neutrons have

none

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4

what charge do electrons have

negative

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5

what charge do protons have

positive

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6

How many electrons does a neutral oxygen atom have

8

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7

How many protons does a neutral oxygen atom have

8

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8

How many neutrons does a neutral oxygen atom have

8

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9

What is another name for protons

Atomic number

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10

How do you find the amount of neutrons in an atom.

Subtract the number of protons (atomic number) from the atomic mass.

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11

When an ion has a negative charge does it have more electrons or protons?

electrons

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12

When an ion has a positive charge does it have more electrons or protons?

protons

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13

When an atom has a neutral charge does it have more electrons or protons?

it has the same number of electrons and protons

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14

what is an ion

an ion is a atom without a neutral charge.

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15

How many electrons can the first electron ring hold

2

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16


How many electrons can every ring besides the first one hold

8

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17

what are the valence electrons

the number of electrons on the most outer electron ring

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18

How many valence electrons does column 1 have

1

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19

How many valence electrons does column 2 have

2

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20

How many valence electrons does column 13 have

3

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21

How many valence electrons does column 14 have

4

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22

How many valence electrons does column 15 have

5

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23

How many valence electrons does column 16 have

6

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24

How many valence electrons does column 17 have

7

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25

How many valence electrons does column 18 have

8

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26

What is the lewis dot method

a way to just show the valence electrons, its just dots around the element symbol

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27

what is conversion of matter

Matter can not be created or destroyed. The number and types of atoms you start with (Reactants) must be the same number and types of atoms you end with (Products)

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28

What is a reactant

what comes before the arrow in a chemical equation. The reactants become the products

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29

What is a product

What comes after the arrow in a chemical equation. The products were the reactants.

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30

What is yield

the arrow in a chemical formula. Indicates a chemical change

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31

what is the 2 in o2 called

subscript

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32

what is MgO in 2 MgO called

chemical formula

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33

what is 2 in 2 MgO called

Coefficient

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34

what is Au (gold) called in a chemical reaction

Chemical symbol

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35
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36

what is an element

a substance that cannot be broken down into another substance

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37

What is a compound

a material formed by chemically bonding two or more chemical elements.

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38

What does a subscript tell you?

How many atoms

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39

What does a coefficent tell you?

how many atoms or molecules of the substance are involved in the reaction

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40

How do you balance a chemical equation

The same number and types of atoms at the start (reactants) and the end (Products)

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41

What column are alkali metals in

1

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42

What column are alkaline earth metals in

2

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43

What column are transition metals in

3-11

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44

What column are noble gases in

18

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45

What column are halogens in

17

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46

where are non metals in the periodic table

right most triangle

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47

Where are the metals in the period table

every element besides the right most triangle and hydrogen

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48

What is the bohr model

a way to show all of the electrons, it is rings (electron shells) with dots in them around the nucleus

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49

What does Ea (a is small) stand for

activation energy

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50

What is activation energy

The minimum quantity of energy that must be reached in order for a reaction to occur

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51

what is a exothermic reaction

a reaction that releases energy. products sit lower on an energy graph

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52

What is an endothermic reaction

Absorbs energy to occur. products sit higher on an energy graph

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53

What does a catalyst do

A castalyst lowers the activation energy in a system which causes the reaction to occur faster. This happens because many more collisions will result in a successful reaction.

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54

What is a Delta (triangle) H in a reaction

the difference between the energy in a rectant and product

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55

What does increasing temperature do in a reaction

speeds up a reaction

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