Key Area 1: Rates of Reaction

Question 1

What type of reactions are explosions?

Answer 1

Fast

Question 2

What type of reactions is rusting?

Answer 2

Slow

Question 3

What are four factors that affect rate?

Answer 3

Increased Concentration (solution)
Increased Temperature
Decreased Particle size (solid)
Catalysts

Question 4

What is a solute?

Answer 4

The solid being dissolved

Question 5

What is a solvent?

Answer 5

The liquid that dissolves

Question 6

What is a solution?

Answer 6

When a solute dissolves in a solvent

Question 7

More particles in the same place means?

Answer 7

More collisions

Question 8

More collisions means?

Answer 8

More effective collisions

Question 9

Rate of reactions definition

Answer 9

The rate of a chemical reaction is a measure of how fast the reactants are being used up and how fast products are being made (speed at which CR takes place)

Question 10

Average rate?

Answer 10

Change in quantity of reactant over time. Slows as reactant is used up.

Question 11

Graphs, gradient?

Answer 11

Gradient at the start shows the rate

Question 12

Graphs, end point?

Answer 12

Flat line at the end is the total volume of gas

Question 13

How do you calculate the average rate?

Answer 13

Change in volume
over
Change in time

Question 14

How do you write the units for average rate?

Answer 14

Cm cubed/ s
or
Cm cubed -1S

Question 15

What is a catalyst?

Answer 15

A substance that speeds up a chemical reaction

Question 16

Catalyst at the end of reaction, summary

Answer 16

Speeds up reaction
Chemically unchanged at the end
Mass stays the same

Question 17

Reactants over time?

Answer 17

Go down, decrease

Question 18

Products overtime?

Answer 18

Go up, increase

Question 19

How do chemical reactions happen?

Answer 19

When the particles and reactants come together

Question 20

What is temperature the measure of?

Answer 20

Kinetic energy

Question 21

Temp, Turns?

Answer 21

Heat into kinetic energy

Question 22

Temp, When they get hotter?

Answer 22

Move faster

Question 23

Using what particles increase reaction rate?

Answer 23

Smaller

Question 24

Increase what cause more collisions at surface?

Answer 24

Surface area

Question 25

Examples of catalysts

Answer 25

Nickel, used for margarine from veg oil Platinum used in car exhausts

Question 26

Test for Oxygen

Answer 26

Relights a glowing splint

Question 27

What do you measure to follow the progress of chemical reactions?

Answer 27

Changes in mass, volume and other quantitys can be measured

Question 28

Graphs can be interpreted in terms of?

Answer 28

End-point of a reaction quantity of product quantity of reactant used effect of changing conditions

Question 29

The rate of a reaction can be shown to decrease over time by?

Answer 29

Calculating the average rate at different stages of the reaction.

Question 30

Weak forces of attraction?

Answer 30

Between molecules