Separate Chemistry 1

Question 1

What can a titration be used to find?

Answer 1

Concentrations

Question 2

Should you add the acid or alkali into the burette?

Answer 2

Acid

Question 3

Why do you do a rough titration first?

Answer 3

So you know the rough location of the titre.

Question 4

It takes 50cm3 of 0.25mol sulfuric acid to nutrilise75cm3 of Sodium hydroxide. Find the concentration of Sodium Hydroxide: 2NaOH+H2SO4-> Na2SO4+2H2O

Answer 4

0.333333333mol/dm3

Question 5

What does % yield compare?

Answer 5

Actual and Theoretical Yield

Question 6

What is the Theoretical Yield?

Answer 6

The mass of Product you make if all the reactants were converted into products.

Question 7

2Fe2O3 + 3C -> 4Fe + 3CO2. Calculate % Yield if you start with 45Kg of Iron Oxide and produced 20Kg of Iron.

Answer 7

63.4920635%

Question 8

What does 100% yield mean?

Answer 8

You got all the products you expected to get

Question 9

Give 3 reasons why you don’t get 100% yield?

Answer 9

Incomplete Reactions
Practical Losses
Unwanted reactions occurring

Question 10

What is Atom Economy?

Answer 10

The % of reactants changed into useful products

Question 11

What is the formula for Atom Economy?

Answer 11

Atom Economy=(total Mr of desired products/total Mr of all products.)*100

Question 12

What does 100% atom economy mean?

Answer 12

All the atoms in the reactants have been turned into useful products

Question 13

What 2 things is high atom economy good for?

Answer 13

Profits and the Environment

Question 14

Do higher pressures favour the forward or backward reaction in the Haber Process?

Answer 14

Forward

Question 15

Do higher temperatures favour the forward or backward reaction in the Haber Process?

Answer 15

Backward

Question 16

What are the compromise conditions reached in the Haber Process?

Answer 16

200 atm of pressure and 450C

Question 17

What is the catalyst used in the Haber Process?

Answer 17

Iron

Question 18

What do fertilisers do?

Answer 18

Help plants grow

Question 19

Which are the 3 main elements needed for plants to grow?

Answer 19

Nitrogen, Potassium and Phosphorus

Question 20

What Is used to produce nitrogen-containing compounds?

Answer 20

Ammonia

Question 21

Give the balanced equation to create ammonium salts.

Answer 21

NH3+HNO3–> NH4NO3

Question 22

Give one way you can make ammonia sulfate in the lab.

Answer 22

Using titrations with ammonia and sulfuric acid

Question 23

What is the equation to calculate the volume of gas from the number of moles?

Answer 23

Molar Volume=Volume/Moles

Question 24

What volume does one mole of gas always occupy at RTP?

Answer 24

24dm3

Question 25

How many moles are there in 8280cm3 of chlorine gas at RTP?

Answer 25

0.345moles

Question 26

What is the only product of the reaction in a hydrogen-oxygen fuel cell?

Answer 26

Water

Question 27

What is the overall balanced equation for the reaction in a hydrogen-oxygen fuel cell?

Answer 27

2H2 + O2 --> 2H2O

Question 28

Give 2 reasons why hydrogen fuel cells will not be widely used for a while.

Answer 28

Very explosive and hard to store the hydrogen Hydrogen takes up a lot of space in storage Hydrogen comes from hydrocarbons that comes from crude oil