Chapter 7: Chemical and Physical Change

Question 1

Define - Physical Change

Answer 1

a change that doesn’t create a new substance

Question 2

Define - Physical Properties

Answer 2

the characteristics that describe it’s physical appearance

Question 3

Define - Change of State

Answer 3

when a substance changes between a solid, liquid gas

Question 4

Define - Density

Answer 4

Is a measure of mass per unit of volume

Question 5

Define - Volume

Answer 5

Is the quantity of 3D of enclosed spaces

Question 6

Define - Freezing

Answer 6

the changing of a liquid to a solid

Question 7

Define - Melting

Answer 7

the changing of a solid to liquid

Question 8

Define - Condensation

Answer 8

the changing of a gas to a liquid

Question 9

Define - Evaporation

Answer 9

the changing of a liquid to gas

Question 10

Define - Sublimation

Answer 10

the changing of a solid to gas

Question 11

Define - Deposition

Answer 11

the changing of a gas to a solid

Question 12

Define - Mixing

Answer 12

Non-chemically combining two or more substances

Question 13

Define - Solute

Answer 13

the solid dissolved in a liquid

Question 14

Define - Solvent

Answer 14

the liquid with a solid dissolved in it

Question 15

Define - Solution

Answer 15

a substance with a solute in a solvent in it

Question 16

Define - Crystallisation

Answer 16

the reverse process of dissolving through evaporation

Question 17

Define - Chemical Change

Answer 17

a change that craters a new substance

Question 18

Define - Precipitate

Answer 18

a solid formed in a chemical change

Question 19

Define - Particle model

Answer 19

a simplified version of solids liquids and gases

Question 20

Define - Solid

Answer 20

a substance that has particles that are closely packed

Question 21

Define - Liquid

Answer 21

a substance that’s particles are loosely bonded

Question 22

Define - Gas

Answer 22

a substance that’s particles are far apart

Question 23

Define - Chemical reaction

Answer 23

the process of rearranging atoms to form a different substance

Question 24

Define - Reactant

Answer 24

The starting substance in a chemical reaction

Question 25

Define - Product

Answer 25

the substances formed in chemical changes

Question 26

Define - Combustion

Answer 26

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

Question 27

Define - Photosynthesis

Answer 27

The process where plants turn light into food and energy

Question 28

Define - Chlorophyll

Answer 28

is the green pigment in plants

Question 29

Define - respiration

Answer 29

is oxygen and glucose turning into water and carbon dioxide

Question 30

Define - Corrosion

Answer 30

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

Question 31

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

Answer 31

physical

Question 32

Is this a chemical or physical reaction - Burning a pizza

Answer 32

chemical

Question 33

Is this a chemical or physical reaction - churning butter

Answer 33

physical

Question 34

Is this a chemical or physical reaction - shredding paper

Answer 34

Physical

Question 35

Is this a chemical or physical reaction - melting ice

Answer 35

Physical

Question 36

Is this a chemical or physical reaction - burning wood

Answer 36

Chemical

Question 37

Is this a chemical or physical reaction - oxidising fruit

Answer 37

chemical

Question 38

List signs of a physical change

Answer 38

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

Question 39

List signs of a chemical change

Answer 39

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

Question 40

An example of a physical property

Answer 40

Feels rough

Question 41

An example of colour change

Answer 41

rust, fruit oxidising, laves turning red

Question 42

An example of smelling gas

Answer 42

rotten eggs

Question 43

An example of a principate being formed

Answer 43

carbon dioxide in calcium hydroxide solution

Question 44

An example of energy being absorbed or produced

Answer 44

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

Question 45

The particle model is -

Answer 45

is a simplified version of solid, liquids and gases

Question 46

What makes each substance different?

Answer 46

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

Question 47

What are properties of substances?

Answer 47

The unique characteristics of a substance

Question 48

How is a word equation set up?

Answer 48

Reactants ---> Products

Question 49

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

Answer 49

Magnesium + Oxygen --> Magnesium Oxide

Question 50

Give an example of a combustion reaction-

Answer 50

Hydrogen + Oxygen ---> water, Methane + Oxygen--> CO2 + H2O

Question 51

what is Methane + Oxygen ---> Carbon Dioxide + water

Answer 51

Combustion

Question 52

Give an example of corrosion reaction:

Answer 52

iron + water ---> iron oxide

Question 53

why does corrosion occur?

Answer 53

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

Question 54

where does corrosion happen?

Answer 54

in metal

Question 55

Where does photosynthesis happen?

Answer 55

In plants

Question 56

Why does photosynthesis happen?

Answer 56

to create food for plants

Question 57

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

Answer 57

Carbon Dioxide + Water ---> Oxygen + glucose

Question 58

Where does respiration happen?

Answer 58

in animals and plants

Question 59

What does respiration do?

Answer 59

It burns food to get energy for humans

Question 60

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

Answer 60

Oxygen + Glucose --> Water + Carbon Dioxide

Question 61

Why is respiration the opposite of photosynthesis?

Answer 61

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

Question 62

Technically, respiration is a type of combustion why?

Answer 62

Becuase it burns oxygen to produce energy

Question 63

Is boiling a potato a physical or chemical reaction?

Answer 63

Physical

Question 64

When substances are heated they expand | The volume_____ and the density______

Answer 64

increases ,decreases

Question 65

When substances are cooled they contract | The volume_____ and the density _______

Answer 65

decreases, increases