1.5 - Rates Of Reaction

Question 1

Rate of reaction found

Answer 1

The amount of product formed in a certain period of time

Question 2

Mass unit

Answer 2

Grams

Question 3

Volume unit (gas)

Answer 3

Cm3

Question 4

Methods of recording rate of reaction

Answer 4

-Measuring the volume of gas given off by a reaction over time
-Measuring the loss of mass over time when gas is produced
-Measuring the amount of light that passes through a reaction mixture as precipitate forms

Question 5

Used for measuring mass

Answer 5

A mass balance

Question 6

Measuring a decrease in mass over time

Answer 6

Data logger

Question 7

Cotton wool in conical flask

Answer 7

Stops gas escaping

Question 8

Used for measuring volume

Answer 8

A gas syringe or upside down measuring cylinder

Question 9

Disadvantages of gas syringe

Answer 9

Delay when connecting

Question 10

Advantages of gas jar

Answer 10

All gas produced is from the reaction mixture

Question 11

Disadvantages of gas jar

Answer 11

Tube may slip from under the gas jar

Question 12

Advantages of gas syringe

Answer 12

Precise scale

Question 13

Measuring precipitate forming

Answer 13

Inspection and light sensor

Question 14

Advantages of inspection

Answer 14

Cheaper and more readily available

Question 15

Disadvantages of inspection

Answer 15

Not very accurate

Question 16

Advantages of light sensor

Answer 16

Data for the entire reaction

Question 17

Disadvantages of light sensor

Answer 17

Light from other sources could interfere with

Question 18

How does a light sensor work ?

Answer 18

It’s connected to a data logger, Then the rate of reaction is calculated from how long it takes for the light level to stop decreasing

Question 19

Mean rate of reaction (Equation)

Answer 19

Maximum product produced/time when reaction was finished

Question 20

Rate of reaction (Equation)

Answer 20

Product formed/time taken

Question 21

Steeper gradient

Answer 21

Faster rate if reaction

Question 22

Horizontal line

Answer 22

Reaction finished

Question 23

Catalyst effect on activation energy

Answer 23

Lower

Question 24

Higher temperature effect on rate of reaction

Answer 24

-More kinetic energy
-More successful collisions
-Increased rate of reaction
-More energy that activation energy

Question 25

Minimum energy required for successful collisions

Answer 25

Activation energy

Question 26

Higher concentration effect on rate of reaction

Answer 26

-More particles per unit of volume -Greater chance of particles colliding -Rate of reaction increases

Question 27

Increased surface area effect on rate of reaction

Answer 27

-More particles exposed to other reactant -Greater chance of particles colliding -Rate of reaction increases

Question 28

Iron as a catalyst

Answer 28

Making ammonia from nitrogen and hydrogen

Question 29

Platinum as a catalyst

Answer 29

Making nitric acid from ammonia

Question 30

Enzymes commercial uses

Answer 30

Washing powder, brewing, making cheese

Question 31

Why are enzymes used for commercial uses ?

Answer 31

More effective