9Fa and b

Question 1

solid-liquid

Answer 1

melting

Question 2

liquid-gas

Answer 2

evaporating

Question 3

gas-liquid

Answer 3

condensing

Question 4

liquid-solid

Answer 4

freezing ( water expands cause of cult stuff)

Question 5

solid-gas

Answer 5

sublimation

Question 6

gas-solid

Answer 6

deposition

Question 7

Physical change

Answer 7

no colour change, no new substance is formed.

Question 8

Chemical change

Answer 8

A new substance is formed through a chemical reaction.

Question 9

water

Answer 9

H2O

Question 10

Solid water

Answer 10

Ice

Question 11

Gas water

Answer 11

Water vapour

Question 12

Examples of physical changes

Answer 12

melting,freezing,smashing,chopping,bending,cutting,crumbling,melting,cutting.

Question 13

Examples of chemical changes

Answer 13

Browning,rusting,rotting,molding,burning,caramelisation,clottting, chemical

Question 14

what are the 3 least reactive metals in the reactivity series?

Answer 14

silver, gold , platinum

Question 15

What is the most reactive metal in the reactivity series?

Answer 15

Potassium

Question 16

Metals reacting with water=

Answer 16

Metal + H2O(water) = Metal hydroxide + hydrogen

Question 17

Metals reacting with dilute acids=

Answer 17

Metal + acid (Hydrtochloric, sulfuric, nitric)= salt ( metal chloride, sulfate, nitrates) + hydrogen

Question 18

Metal reacting with oxygen=

Answer 18

Metal + oxygen (O2) = Metal oxide

Question 19

What metals (in the reactivity series) react with water and dilute acids?

Answer 19

Lead,Potassium,Sodium,Lithium,Calcium,Mg,Aluminium,Zinc,Iron,Tin

Question 20

What metals(from the reactivity series) react with oxygen but not water?

Answer 20

Copper,Mercury,Silver

Question 21

What is the reactivity series?

Answer 21

A list of metals from the least to most reactive

Question 22

Methane + Oxygen = Carbon Dioxide + Water

What are the reactants?

Answer 22

Methane + Oxygen

Question 23

Methane + Oxygen = Carbon Dioxide + Water

What are the Products?

Answer 23

Carbon Dioxide + Water

Question 24

What is the chemical formula for Sulfuric acid?

Answer 24

H2SO4

Question 25

What is the chemical formula for Hydrochloric acid(solution)/Hydrogen chloride (gas form)?

Answer 25

HCl

Question 26

What is the chemical formula for Sodium Hydroxide?

Answer 26

NaOH

Question 27

What is the chemical formula for Calcium Carbonate?

Answer 27

CaCO3

Question 28

What is the chemical formula for Nitric Acid?

Answer 28

HNO3

Question 29

What is the chemical formula for Iron Sulfate?

Answer 29

FeSO4

Question 30

What is the chemical formula for Aluminium chloride?

Answer 30

AlCl3

Question 31

What is the chemical formula for Calcium Hydroxide?

Answer 31

Ca(OH)2

Question 32

What is the chemical formula for Mgsulfate

Answer 32

MgSO4

Question 33

What is the arrangement of gases?

Answer 33

Far apart and random

Question 34

What is the movement of gases?

Answer 34

Quickly in all directions

Question 35

What happens to gases if the temp increases?

Answer 35

Kinetic energy of the particles increases, there will be more contact with the edge of the box and more collisions. the frequency of collisions increases between particles.

Question 36

What is a frequency?

Answer 36

How many collisions in a given time

Question 37

what happens to volume as you increase temp?

Answer 37

The volume is directly proportional to the temp. as the temp increases, so does the volume.

Question 38

what happens to pressure as you increase temp?

Answer 38

The pressure is directly proportional to the temp. as the temp increases, so does the Pressure.

Question 39

What happens to Pressure as you increase the volume?

Answer 39

The pressure of the gas is inversely proportioned to the volume. If pressure is high, the frequency rises and volume decreases. If the pressure is low, the volume is high.