Paper 1 past paper questions

Question 1

Describe the structure and bonding in magnesium

Answer 1

There is a giant lattice of cations with electrostatic forces of attraction between cations with delocalised electrons

Question 2

What’s is the formula for reacting magnesium with steam

Answer 2

Mg(s) + H₂O(g) — MgO(s) + H₂(g)

Question 3

What’s are some observations for reacting steam with magnesium

Answer 3

A white flame and a grey powder is formed

Question 4

What’s the least soluble group 2 metal and what is it used for

Answer 4

• Ba(SO₄)
• Barium meals for x rays

Question 5

What is electron impact

Answer 5

High energy electrons are used to knock out an electron from each molecule

Question 6

What atoms can be separated with electrolysis

Answer 6

Atoms above carbon in the reactivity series

Question 7

What atoms aren’t separated with electrolysis

Answer 7

Atoms below carbon but above hydrogen in the reactivity series as they can be displaced by carbon instead

Question 8

What are native metals

Answer 8

Metals below hydrogen in the reactivity series and found in their pure metallic form

Question 9

What is the test for reactivity for metals

Answer 9

• Look at the covered in oil
• Observe them in air as some react with oxygen
• observe in cold water as some will react with cold water
• observe in hot water as some will react with hot water

Question 10

Define relative atomic mass

Answer 10

The average mass of an atom compared to 1/12 of a carbon 12 atom

Question 11

What the reason for adding chlorine to drinking water and a disadvantage

Answer 11

Adding chlorine to water kills bacteria but chlorine can be toxic

Question 12

Na+ and F- have the same electron configuration. Explain why a fluoride ion is larger than a sodium ion.

Answer 12

Fluorine has a lower nuclear charge so the attraction to the outer shell of electron is weaker so the atomic radius is larger

Question 13

Why do ionic compounds have high melting points

Answer 13

Because there is a giant ionic lattice with strong electrostatic forces of attraction between the oppositely charged ion so a lot of energy is required to break them

Question 14

how do the results for the flame testa arrise

Answer 14

• electrons are promoted to a higher energy level
• they return to a lower energy shell
• the release energy at different frequency whick we can see as visible light

Question 15

A student plans to titrate botanic acid solution with a solution of ethyl amine explain why this titration couldn’t be done using an indicator

Answer 15

This is a weak acid and weak base titration so the pH change is too gradual

Question 16

Why is Electronspray ionisation is used instead of Elton impact for the ionisation of protein

Answer 16

The protein doesn’t break up

Question 17

How are ions detected in TOF mass spectrometry and how is relative abundance of ions determined

Answer 17

Ions hit the detector where they gain an electron which generates a current
Current is proportional to the abundance

Question 18

State one advantage of using methanol rather than hydrogen in fuel cells in use for cars

Answer 18

Methanol is a liquid so can be easily stored and transported

Question 19

State why fuel cells don’t need to be electrically recharged

Answer 19

There is a continuous supply of reactants

Question 20

What bonds in EDTA form coordinate bonds

Answer 20

4 of the O- ions and 2 N atoms

Question 21

State why the concentration of aluminium sulfate solution can’t be determined by calorimetry

Answer 21

Colourless solution/ cant absorb visible light

Question 23

Why is the enthalpy of hydration of fluoride ions more negative than the enthalpy of hydration of chlorine ions

Answer 23

Fluoride ions have a higher charge density because the ion is smaller
Stronger attraction to the electron

Question 24

what would happen to the EMF if the surface area of the platinum electrode increases

Answer 24

The EMF won’t change

Question 25

what is the equation for sulfur and water

Answer 25

SO₂ +H₂O –> H₂SOH₄

Question 26

reaction between phosphorus and excess oxygen

Answer 26

P₄ +SO₄ –> P₄O₁₀