Paper1-SC14/SC15/SC16

Question 1

What is the equation for ammonium sulfate?

Answer 1

Question 2

Explain the apparatus for a hydrogen pxygen fuel cell.

Answer 2

Question 3

What factors are taken into account when choosing a reaction pathway?

Answer 3

Availability and cost of raw materials, the rate of reaction and equilibrium position and atom economy and yield and usefulness of by-products.

Question 4

What is the other equation for concentration in mol dm?

Answer 4

Question 5

What is the equation for atom economy?

Answer 5

Question 6

How is the energy transferred in chemical cells?

Answer 6

Mainly electricity but a bit of heating.

Question 7

What are titrations used to find?

Answer 7

Exact amount of acid that neutralises a specific volume of alkali. We use indicators that are not universal so the change is not graduate and it is like big step.

Question 8

What is ammonium nitrate?

Answer 8

Nitrogen rich fertiliser(nitrogenous fertiliser).

Question 9

Explain the apparatus for a chemical cell?

Answer 9

Question 10

Why do batteries go flat?

Answer 10

When one of the reactants is used up the reaction stops and voltage is no longer produced.

Question 11

What is the equation for the amount of gas(mol)?

Answer 11

Question 12

What type of process is the laboratory preparation of ammonium sulfate?

Answer 12

Batch process, whereas the industrial preparation is continuous.

Question 13

Where is a solution with an accurate concentration made?

Answer 13

In a volumetric flask which are calibrated to measure one volume of solution.

Question 14

What is the equation for concentration in mol dm?

Answer 14

Question 15

What happens in a dynamic equilibrium?

Answer 15

Forwards and backwards reaction happen at same rate and the concentrations of all reacting substances do not change.

Question 16

What is the equation for concentration in mold dm?

Answer 16

Question 17

How can you convert cm to dm?

Answer 17

Divide by 1000.

Question 18

What components are used in chemical cells?

Answer 18

Two different metals each dipped into a solution of one of their salts. A salt bridge to allow dissolved ions to pass from one solution to another.

Question 19

What does avogrado’s law state?

Answer 19

If the temperature and pressure are the same. equal volumes of different gases contain an equal number of molecules.

Question 20

What is the equation for percentage yield?

Answer 20

Question 21

What are the strengths and weaknesses of fuel cells?

Answer 21

They do not produce carbon dioxide, however most hydrogen is manufactured by the reaction of steam with coal or natural gas which releases carbon dioxide as a by-product. Very hard tp stpre hydrogen and can be dangerous if released(simple and light so hard to store).

Question 22

What is atom economy?

Answer 22

Method of showing how efficient a particular reaction makes use of the atoms in the reactants.

Question 23

What is another equation for the concentration in g dm?

Answer 23

Question 24

What is the mole ratio?

Answer 24

Ratio in moles of the substance in a balanced equation.

Question 25

What does the percentage yield do?

Answer 25

Compares the actual yield and the theoretical yield.

Question 26

What is the actual yield?

Answer 26

The amount of product obtained when you carry out an experiment.

Question 27

What are some of the reasons the actual yield is less than the theoretical yield?

Answer 27

The reaction may be incomplete as the reaction may not have been left for long enough or the reaction may reach equilibrium. Some of the product could be left in the storage container or there may be other unwanted side reactions.

Question 28

What part of the meniscus do you measure from?

Answer 28

The bottom(make sure your eyes are at the same level).

Question 29

Explain the industrial production of ammonium sulfate.

Answer 29

Question 30

Explain how change in conditions affects the position of equilibrium.

Answer 30

Question 31

Explain the difference in the laboratory production and industrial production of ammonium sulfate.

Answer 31

Question 32

What do fertilisers do?

Answer 32

Replace the mineral ions needed by plants and so promote plant growth.

Question 33

Explain the core practical on acid alkali titration.

Answer 33

Question 34

What is theoretical yield?

Answer 34

The maximum mass of product that can be formed from the reactant.

Question 35

Can you do a titration calculation?

Answer 35

If not watch a video on it you speck.

Question 36

What may fertilisers contain to promote plant growth?

Answer 36

Nitrogen, phosphorus and potassium compounds.

Question 37

What is ammonium sulfate?

Answer 37

Another nitrogenous fertiliser that is made in the laboratory.

Question 38

What makes some batteries rechargable?

Answer 38

The reaction is reversable.

Question 39

Are chemical cells exothermic?

Answer 39

Yes as the temperature increases.

Question 40

What is the equation for ammonium nitrate?

Answer 40

Question 41

What is molar gas volume?

Answer 41

Volume occupied by one mole of molecules of any gas. It is 24dm at room temperature.