Past paper things I got wrong

Question 1

In an industrial process, ammonia is used to produce nitric acid. Name the catalyst used in this process.

Answer 1

platinum

Question 2

Suggest why a catalyst may be used in an industrial process to produce ammonia.

Answer 2

speeds up reaction OR

less energy / heat is required

Question 3

Name the power supply that must be used to electrolyse solution

Answer 3

direct current (d.c.)

Question 4

During electrolysis, metal ions are changed to metal atoms. Name this type of chemical reaction.

Answer 4

reduction

Question 5

Gas is produced at the _______ electrode.

Answer 5

positive

Question 6

Does but-2-ene form two products when reacted with hydrogen bromide?

Answer 6

no

Question 7

What caused some of the positive particles to be deflected when they were fired at a very thin layer of gold foil?

Answer 7

they were repelled by the positive nucleus in the gold atoms because like charges repel.

Question 8

properties of discrete covalent molecular

Answer 8

do not conduct electricity and have low melting points

Question 9

properties of covalent network

Answer 9

do not conduct electricity and have high melting points

Question 10

properties of ionic lattice

Answer 10

have high melting points and conduct electricity when liquid but not when solid

Question 11

properties of metallic lattice

Answer 11

conduct electricity when solid and have a wide range of melting points

Question 12

Explain why butane has a higher boiling point than propane. (2)

Answer 12

butane has stronger forces of attraction between molecules.

Question 13

Suggest one disadvantage of adding sulfur compounds, such as ethyl mercaptan, to fuels such as LPG

Answer 13

produces acid rain // acidic gases

Question 14

Copper oxide - does it leave pH unchanged when shaken with water?

Answer 14

yes

Question 15

In industry, calcium oxide is reacted with sulfur dioxide to reduce the volume of sulfur dioxide released into the atmosphere.
Explain why calcium oxide is able to reduce the volume of sulfur dioxide gas released.

Answer 15

calcium oxide is a base

Question 16

Electrons can be removed from all atoms.
The energy required to do this is called the ionisation energy.
The first ionisation energy for an element is defined as the energy required to remove one mole of electrons from one mole of atoms, in the gaseous state.
The equation for the first ionisation energy of chlorine is
Cl(g) —-> Cl+(g) + e−
State the electron arrangement for the Cl+ ion.

Answer 16

2, 8, 6

just remove an electron – do not confuse yourself it is as easy as this

Question 17

Electrons can be removed from all atoms.
The energy required to do this is called the ionisation energy.
The first ionisation energy for an element is defined as the energy required to remove one mole of electrons from one mole of atoms, in the gaseous state.
The equation for the first ionisation energy of chlorine is
Cl(g) —-> Cl+(g) + e−
Write the equation for the first ionisation energy of magnesium.

Answer 17

Mg → Mg+ + e-

state symbols are not needed

Question 18

what is an isomer

Answer 18

compounds with same molecular / chemical but different structural formula.

Question 19

Polyesters are always made from monomers

Answer 19

with two functional groups per molecule.

Question 20

Name the type of chemical reaction taking place when limonene reacts with bromine solution

Answer 20

addition

Question 21

The purpose of the potassium nitrate solution is to complete the circuit.
State the term used to describe an ionic compound which is used for this purpose.

Answer 21

electrolyte

Question 22

when copper and zinc are put in a cell what is the path of electron flow

Answer 22

zinc to copper

Question 23

Name a non-metal element which is suitable for use as an electrode

Answer 23

carbon // graphite

Question 24

When a Q asks for average volume required to neutralise ___ make sure to ignore

Answer 24

rough titration

Question 25

When a Q asks what salt can be prepared by a precipitation reaction

Answer 25

look through the data book to find which is insoluble then that is the answer. only insoluble salts can be produced by a precipitation reaction.

Question 26

when something is dissolved in water. is water the solute or solvent?

Answer 26

solvent