E block core questions

Question 1

C6.1 Physical and chemical change

Answer 1

C7.3.6 Preparing insoluble salts

Question 2

What is a chemical reaction?

Answer 2

A process in which new chemicals are made from old

Question 3

What are the three main signs of a chemical reaction?

Answer 3

Bubbles, temperature change, colour change

Question 4

What is a chemical change?

Answer 4

An irreversible change in the arrangement of atoms

Question 5

What is a physical change?

Answer 5

A reversible change in the arrangement of particles

Question 6

Name six types of physical change

Answer 6

Melting, boiling, evaporation, condensation, sublimation, dissolving

Question 7

What does the state symbol (s) mean?

Answer 7

Solid

Question 8

What does the state symbol (l) mean?

Answer 8

Liquid

Question 9

What does the state symbol (g) mean?

Answer 9

Gas

Question 10

What does the state symbol (aq) mean?

Answer 10

Aqueous/dissolved in water

Question 11

What is a solvent?

Answer 11

A liquid in which something dissolves

Question 12

What is a solute?

Answer 12

A chemical which dissolves in a liquid

Question 13

What is a solution?

Answer 13

A mixture of a solvent and a solute

Question 14

What does soluble mean?

Answer 14

Will dissolve

Question 15

What does insoluble mean?

Answer 15

Will not dissolve

Question 16

C6.2.5 Explaining rates (E)

Answer 16

C6.2.4 Factors affecting the rate of reaction

Question 17

What must particles do in order to have a chance to react?

Answer 17

Collide (with sufficient energy and in the correct orientation)

Question 18

What is rate of reaction?

Answer 18

How quickly a reaction takes place

Question 19

Units and symbols for rate?

Answer 19

Cubic centimetres per second (cm3/s) & grams per second (g/s)

Question 20

What is rate of reaction?

Answer 20

How quickly a reaction takes place

Question 21

Units and symbols for rate?

Answer 21

Cubic centimetres per second (cm3/s) & grams per second (g/s)

Question 22

How can you monitor rate of reaction?

Answer 22

How quickly a product is formed or a reactant is used

Question 23

How can you measure how quickly a product is formed?

Answer 23

Volume of gas per second using a gas syringe, change in mass

Question 24

How can you measure how quickly a reactant is used?

Answer 24

Change in mass

Question 25

How can you monitor changes in concentration to measure rate?

Answer 25

Changes in colour or turbidity (disappearing cross)

Question 26

How can you calculate relative rate from time taken?

Answer 26

relative rate = 1/time taken

Question 27

On a graph of concentration/mass/volume of gas against time, what is represented by the gradient?

Answer 27

rate of reaction

Question 28

What are the 5 factors that can alter the rate of reaction?

Answer 28

Temperature, surface area, pressure (gases), concentration and catalyst

Question 29

What is activation energy?

Answer 29

The minimum energy with which particles must collide in order to react

Question 30

C6.2.3 Practical Measuring disappeareance of reactants

Answer 30

C6.2.7 Practical: the effect of particle size on reaction rate

Question 31

Unit and symbol for mass?

Answer 31

Kilogram/kg (gram/g)

Question 32

Unit and symbol for volume?

Answer 32

Cubic metres/m3 (cubic centimetres/cm3) (cubic decimetre/dm3)

Question 33

What is rate of reaction?

Answer 33

How quickly a reaction takes place

Question 34

Units and symbols for rate?

Answer 34

Cubic centimetres per second (cm3/s) & grams per second (g/s)

Question 35

How can you monitor rate of reaction?

Answer 35

How quickly a product is formed or a reactant is used

Question 36

How can you measure how quickly a reactant is used?

Answer 36

Change in mass

Question 37

On a graph of concentration/mass/volume of gas against time, what is represented by the gradient?

Answer 37

rate of reaction

Question 38

What are the 5 factors that can alter the rate of reaction?

Answer 38

Temperature, surface area, pressure (gases), concentration and catalyst

Question 39

How does temperature affect rate of reaction?

Answer 39

Increasing temperature increases rate of reaction

Question 40

What needs to happen to collisions between particles to increase rate?

Answer 40

Increased frequency and/or increased energy

Question 41

What effect does breaking solid matter into smaller bits have on surface area?

Answer 41

Increases surface area to volume ratio.

Question 42

How does surface area affect rate of reaction?

Answer 42

Increasing surface area increases rate of reaction

Question 43

Why does a larger surface area increase rate of reaction?

Answer 43

More particles at the surface and available for collisions