Chemistry November Mock

Question 1

Why does adding a catalyst affect rate of reaction? (Collision Theory)

Answer 1

• Increases rate of reaction.
  -Provides Alternate route
  -Lower Activation energy
  -higher proportion of particles that have sufficient energy to react

Question 1

Suitable name and formula for a catalyst

Answer 1

Manganese (IV) Oxide. MnO2

Question 2

Formula for Rf (Chromatography)

Answer 2

Distance moved by Dye / Distance moved by the Solvent.

Question 3

How to carry out chromatography experiment?

Answer 3

Draw start line in Pencil.
-Place food colourings along a start line.
-Place paper in beaker with start line above solvent.
-Mark solvent front.
-Remove paper and allow to dry.

Question 4

Why is Xe unreactive? (Noble Gas)

Answer 4

As Xe has a full outer shell of electrons.

Question 5

Define the Term Isotopes.

Answer 5

Atoms of the same element with number of protons but different number of neutrons.

Question 6

Why is it better to use a pipette than a measuring cylinder?

Answer 6

Measurement is more precise

Question 7

State the colour of methyl orange in barium hydroxide solution.

Answer 7

Yellow

Question 8

Why is universal indicator not suitable in titration

Answer 8

The colour change is gradual.

Question 9

State 2 observations seen when burning magnesium to form Magnesium oxide

Answer 9

Bright White light and a white powder.

Question 10

Explain how Magnesium conducts electricity

Answer 10

Magnesium conducts as it has delocalized electrons, the electrons are free to move.

Question 11

Explain how magnesium chloride conducts electricity

Answer 11

Magnesium chloride can only conduct in a molten state, as the ions are free to move.

Question 12

State the name of a fraction whose Viscosity is greater than Fuel oil

Answer 12

Bitumen

Question 13

State the name of a fraction whose Boiling point range is lower than fuel oil

Answer 13

Diesel,Gasoline,Refinery gases

Question 14

Why is Carbon Monoxide toxic?

Answer 14

As it prevents oxygen transport throughout the body

Question 15

What are the conditions needed for Ethane to react with Bromine and why

Answer 15

The reaction requires UV light as it provides energy

Question 16

State the type of reaction between Ethane and Bromine

Answer 16

Substitution Reaction

Question 17

What is the Alkane with the formula CH4?

Answer 17

Methane

Question 18

What is the Alkane with the formula C2H6?

Answer 18

Ethane

Question 19

What is the Alkane with the formula C3H8

Answer 19

Propane

Question 20

What is the Alkane with the formula C4H10

Answer 20

Butane

Question 21

What is the Alkane with the formula C5H12

Answer 21

Pentane

Question 22

What is the Alkene with the formula C2H4

Answer 22

Ethene

Question 23

What is the Alkene with the formula C3H6

Answer 23

Propene

Question 24

What is the Alkene with the formula C4H8

Answer 24

Butene

Question 25

What is the Alkene with the formula C5H10

Answer 25

Pentene

Question 26

Reaction for Ethane with Bromine

Answer 26

C2H6 + Br2 —-> C2H5Br + HBr

Question 27

Name the polymer that is good for non stick pans.

Answer 27

Poly (Tetrafluoroethene)

Question 28

What is the use of Poly (Ethene)

Answer 28

Drinks bottles and Shopping bags

Question 29

What is the use of Poly (Propene)

Answer 29

Storage Boxes and Climbing Ropes

Question 30

What is the use of Poly (Chloroethene)

Answer 30

Wire Insulation and Drainpipes

Question 31

Why is carbon monoxide toxic

Answer 31

Prevents the transportation of oxygen throughout the body.

Question 32

Uses of Kerosine

Answer 32

Aircraft Fuel

Question 33

Use of Refinery gases

Answer 33

Cooking oil

Question 34

How is the crude oil split into fractions

Answer 34

The oil is heated and evaporates to become a gas

Cool at the top and hot at the top

The gases rise and condense at the point where it’s boiling point matches

Bitumen at the bottom as it has the highest boiling point and refinery gases at the bottom as it has the lowest boiling point.