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Joey's Science Test > Joey Test Nov 18 > Flashcards

Joey Test Nov 18 Flashcards

1
Q

What is a Chemical Bond?

A

Force that holds 2 or more atoms together

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2
Q

What are Valence Electrons Attracted To?

A

To the Nucleus of another atom

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3
Q

Does a Stable or Unstable Bond have a full valance shell?

A

Stable has a full valance shell

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4
Q

How many electrons make up a full valance shell

A

8 electrons

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5
Q

What is a covalent bond?

A

Electrons shared between atoms

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6
Q

What is a chemical formula?

A

Chemical symbols & numbers that represent the number of atoms in a compound

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7
Q

What is an Ion?

A

Atom No Longer electrically neutral

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8
Q

What is an ionic bond?

A

Metal donates an electron to a non metal

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9
Q

Can you practice drawing a single, double and triple bond?

A
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10
Q

How draw an Ionic Bond?

A
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11
Q

What is a metallic bond?

A

2 or more metals share their electrons

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12
Q

What is difference between ionic and metal bond?

A

ionic bond donates metal to an electron..metallic bond is when metal shares electrons with another metal

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13
Q

Name 4 Properties of a Metallic Bond

A
  1. Solid at room temperature
  2. High Melting / Boiling Point
  3. Don’t Disolve
  4. Good conductor of heat & electricity
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14
Q

What is difference between physical & chemical change?

A

Physical changes don’t produce a new substance, Chemical Change is one or more substance creating new substance

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15
Q

Is Brownie Batter physical or chemical change?

A

Chemical Change

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16
Q

What is a chemical change?

A

one or more substances change into new substance

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17
Q

What are signs of chemical reaction

A
  1. change in color
  2. change in odor
  3. bubbles form
  4. precipitation forms
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18
Q

What happens during chemical reaction?

A

Breaking chemical bonds between reactant molecules and forming new bonds between atoms in product particles

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19
Q

What is the number in front of an element that can be changed called?

A

Coefficient

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20
Q

What is the little number to the right of element that can not be changed called?

A

Subscript

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21
Q

What is a combustion reaction?

A

involves a substance combining with oxygen and releases energy

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22
Q

What is a decomposition reaction?

A

a compound breaks down for 2 or more substances

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23
Q

What is a single replacement?

A

When 1 element replaces another element in a compound

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24
Q

What is a double replacement?

A

Negative ions in 2 compounds switch places forming 2 new compounds

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25
Q

What is a synthesis reaction?

A

Reaction where 2 or more substances combine and form 1 compound

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26
Q

What happens to energy when you break bonds?

A

Bonds absorb energy

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27
Q

What happens to energy when you form bonds?

A

Forming bonds releases energy

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28
Q

What is Endothermic?

A

Reactions that absorb energy

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29
Q

What is Exothermic Reaction?

A

Reaction that releases energy

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30
Q

What is activation energy?

A

The minimum amount of energy needed to start a chemical reaction

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31
Q

What are factors that affect the rate of reaction?

A

Surface Area / Temperature / Concentration

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32
Q

What are inhibitors?

A

A substance that slows down or stops a chemical reaction

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33
Q

What is it called when 2 or more metals share electrons

A

Metallic Bond

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34
Q

What is the minimum amount of energy needed to start a chemical reaction?

A

Activation Energy

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35
Q

The more particles collide, will the reaction be quicker or slower

A

quicker

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36
Q

What is Surface Area?

A

Amount of Are Exposed

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37
Q

If temperature is cooler..do particles move faster or slower?

38
Q

An increase in concentration do collisions increase or decrease?

39
Q

Do smaller particles raise surface area?

40
Q

What does a catalyst do?

A

Increases rate of reaction by lowering the activation energy (enzymes)

41
Q

What is it called when enzyme breaks down proteins into smaller pieces

42
Q

What is an inhibitator

A

A substance that slows down or stops a chemical reaction

43
Q

What is sometimes used in medicine to attack enzymes in bacteria to slow their growth?

44
Q

What does breaking bonds due to energy?

A

Absorbs It

45
Q

What does the formation of bonds do to energy?

A

releases energy

46
Q

What are reactions that absorb energy called?

A

Endothermic Reactions

47
Q

Is more energy required to break bonds?

48
Q

What is a chemical reaction that releases thermal energy called?

A

Exothermic Reaction

49
Q

Which requires more energy, exothermic or endothermic?

A

exothermic

50
Q

Reactancts = Products + Thermal Energy is Endothermic or Exothermic

A

Exothermic

51
Q

Reactants + Thermal Energy = Products is Endothermic or Exothermic?

A

Endothermic

52
Q

Can you change the subscript in a compound and have it stay the same?

53
Q

What happens if you change the subscript of an atom?

A

you have different properties of the atom

54
Q

If you change the coefficient…do properties of atom stay the same?

55
Q

What is the description of a chemical reaction using element symbols and chemical formulas called?

A

Chemical Equation

56
Q

When 2 atoms of the same element are bonded together, what called?

A

Diatomic Molecule

57
Q

What is a Reactant?

A

Starting Substances

58
Q

What are Products?

A

Substances produced by a chemical reaction

59
Q

What is the law of Conservation of Mass:

A

Total mass of reactants = the mass of the products

60
Q

Cutting a piece of cloth is example of what type of change?

A

Physical Change

61
Q

Can physical changes be undone?

A

Often, yes

62
Q

What makes your blood red?

63
Q

How are physical and chemical changes the same?

A

You can see changes

64
Q

What happens when 1 or more substances react to form new substance?

A

Chemical Change

65
Q

What are 3 steps in chemical reaction?

A
  1. Energy Added
  2. Bonds Break
  3. Atoms rearrange themselves and bond
66
Q

What called when 2 or more elements share their electrons?

A

Metallic Bond

67
Q

Do Metallic Bonds Disolve?

68
Q

Do physical changes produce new substance?

69
Q

Do chemical changes produce new substance?

70
Q

What is a chemical reaction?

A

when a substance change causes a chemical change

71
Q

What happens during a synthesis reaction?

A

2 or more substances combine for 1 compound

72
Q

What happens during a decomposition reaction?

A

A compound breaks down for 2 or more substances

73
Q

2 Mg + O2 turns to 2MgO is synthesis or decompostion?

74
Q

What called when a compound breaks down for 2 or more substances?

A

Decomposition

75
Q

When negative ions in 2 compounds switch places forming 2 new compounds, what called?

A

Double replacement, this is type of chemical reaction

76
Q

Why do you need inhibitors?

A

because you can make a reaction slower and more controllable. Example is if there is a fire or going to explode you can use an inhibitor to slow it down

77
Q

What is most abundant mealloid?

78
Q

what are 4 properties of metalloids?

A
  1. Solids
  2. Semi Conductors
  3. Color
  4. Form Compounds
79
Q

What is the distance between the nuclei of the atom and valance shell called?

80
Q

What is Ionization Energy?

A

The ability to move an electron from the valance shell

81
Q

What is the temperature at which a substance turns from liquid to gas?

A

Boiling Point

82
Q

What type of atoms have same number of protons and electrons?

A

Neutral Atoms

83
Q

What is the area of space where electrons move around the nucleus called?

A

Energy Levels

84
Q

How many electrons can be in the lowest energy level?

85
Q

How many electrons can be in 2nd energy level?

86
Q

What are Valence Electrons attracted to?

A

The nucleus of another atom, causes a chemical bond

87
Q

What is a chemical bond?

A

A force that holds 2 or more atoms together

88
Q

Are protons positive or negative?

89
Q

Are Electrons positive or negative?

90
Q

What type of charge do Neutrons have?

Joey's Science Test (1 decks)

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