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Science > Chapter 7: Chemical and Physical Change > Flashcards

Chapter 7: Chemical and Physical Change Flashcards

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1
Q

Define - Physical Change

A

a change that doesn’t create a new substance

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2
Q

Define - Physical Properties

A

the characteristics that describe it’s physical appearance

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3
Q

Define - Change of State

A

when a substance changes between a solid, liquid gas

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4
Q

Define - Density

A

Is a measure of mass per unit of volume

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5
Q

Define - Volume

A

Is the quantity of 3D of enclosed spaces

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6
Q

Define - Freezing

A

the changing of a liquid to a solid

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7
Q

Define - Melting

A

the changing of a solid to liquid

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8
Q

Define - Condensation

A

the changing of a gas to a liquid

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9
Q

Define - Evaporation

A

the changing of a liquid to gas

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10
Q

Define - Sublimation

A

the changing of a solid to gas

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11
Q

Define - Deposition

A

the changing of a gas to a solid

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12
Q

Define - Mixing

A

Non-chemically combining two or more substances

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13
Q

Define - Solute

A

the solid dissolved in a liquid

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14
Q

Define - Solvent

A

the liquid with a solid dissolved in it

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15
Q

Define - Solution

A

a substance with a solute in a solvent in it

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16
Q

Define - Crystallisation

A

the reverse process of dissolving through evaporation

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17
Q

Define - Chemical Change

A

a change that craters a new substance

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18
Q

Define - Precipitate

A

a solid formed in a chemical change

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19
Q

Define - Particle model

A

a simplified version of solids liquids and gases

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20
Q

Define - Solid

A

a substance that has particles that are closely packed

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21
Q

Define - Liquid

A

a substance that’s particles are loosely bonded

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22
Q

Define - Gas

A

a substance that’s particles are far apart

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23
Q

Define - Chemical reaction

A

the process of rearranging atoms to form a different substance

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24
Q

Define - Reactant

A

The starting substance in a chemical reaction

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25
Q

Define - Product

A

the substances formed in chemical changes

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26
Q

Define - Combustion

A

a chemical reaction where a substance is burnt with oxygen producing light and heat

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27
Q

Define - Photosynthesis

A

The process where plants turn light into food and energy

28
Q

Define - Chlorophyll

A

is the green pigment in plants

29
Q

Define - respiration

A

is oxygen and glucose turning into water and carbon dioxide

30
Q

Define - Corrosion

A

Damage that happens to metals when it reacts with oxygen or water (iron has properties that causes it to react with water and air

31
Q

Is this a chemical or physical reaction - mixing ingredients for a cake

A

physical

32
Q

Is this a chemical or physical reaction - Burning a pizza

A

chemical

33
Q

Is this a chemical or physical reaction - churning butter

A

physical

34
Q

Is this a chemical or physical reaction - shredding paper

A

Physical

35
Q

Is this a chemical or physical reaction - melting ice

A

Physical

36
Q

Is this a chemical or physical reaction - burning wood

A

Chemical

37
Q

Is this a chemical or physical reaction - oxidising fruit

A

chemical

38
Q

List signs of a physical change

A

changing shape/form, expands or contracts, changes state, mixers with another substance, is reversible

39
Q

List signs of a chemical change

A

change in colour, smelling gas or seeing bubbles, a principate is formed, temperature change, energy is absorbed or produced

40
Q

An example of a physical property

A

Feels rough

41
Q

An example of colour change

A

rust, fruit oxidising, laves turning red

42
Q

An example of smelling gas

A

rotten eggs

43
Q

An example of a principate being formed

A

carbon dioxide in calcium hydroxide solution

44
Q

An example of energy being absorbed or produced

A

chemical ice pack, photosynthesis, fireworks, explosions, glow stick

45
Q

The particle model is -

A

is a simplified version of solid, liquids and gases

46
Q

What makes each substance different?

A

the properties - determined by the types of atoms and how they are arranged in it

47
Q

What are properties of substances?

A

The unique characteristics of a substance

48
Q

How is a word equation set up?

A

Reactants —> Products

49
Q

Make the word equation: Mg and O2 rearrange to form MgO

A

Magnesium + Oxygen –> Magnesium Oxide

50
Q

Give an example of a combustion reaction-

A

Hydrogen + Oxygen —> water, Methane + Oxygen–> CO2 + H2O

51
Q

what is Methane + Oxygen —> Carbon Dioxide + water

A

Combustion

52
Q

Give an example of corrosion reaction:

A

iron + water —> iron oxide

53
Q

why does corrosion occur?

A

Iron has chemical properties that causes it to react to water and oxygen

54
Q

where does corrosion happen?

A

in metal

55
Q

Where does photosynthesis happen?

A

In plants

56
Q

Why does photosynthesis happen?

A

to create food for plants

57
Q

What is the chemical reaction in photosynthesis? (word equation)

A

Carbon Dioxide + Water —> Oxygen + glucose

58
Q

Where does respiration happen?

A

in animals and plants

59
Q

What does respiration do?

A

It burns food to get energy for humans

60
Q

What is the chemical reaction in respiration ? (word equation)

A

Oxygen + Glucose –> Water + Carbon Dioxide

61
Q

Why is respiration the opposite of photosynthesis?

A

Because it rearranges oxygen and glucose into water and carbon dioxide and photosynthesis does the reverse

62
Q

Technically, respiration is a type of combustion why?

A

Becuase it burns oxygen to produce energy

63
Q

Is boiling a potato a physical or chemical reaction?

A

Physical

64
Q

When substances are heated they expand

The volume_____ and the density______

A

increases ,decreases

65
Q

When substances are cooled they contract

The volume_____ and the density _______

A

decreases, increases

Science (3 decks)

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