AQA AS Level Chemistry Paper 1
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Give the full electron configuration of the element in period 3 with the highest first ionisation
energy (1) - CORRECT ANSWER Argon
1s2 2s2 2p6 3s2 3p6
give an equation including state symbols to represent the process that occurs when the second
ionisation energy of sodium is measured (1) - CORRECT ANSWER Na+ (g) --> Na2+ (g) + e-
table 1 shows some successive ionisation energies for an element in period 3. Identify the
period 3 element. Explain your CORRECT ANSWER (3) - CORRECT ANSWER Element: Sulfur (1)
Explanation: big difference between the 6th and 7th ionisation energies (1)
which indicates electron moves from the 2nd energy level which has lower energy (1)
this question is about the elements in group 2.
Describe the structure and bonding of magnesium (2 marks) - CORRECT ANSWER Magnesium
has a lattice of Mg2+ ions. (1)
, There is strong electrostatic attraction between the Mg2+ ions and there are delocalised
electrons in the lattice (1)
state the trend in the atomic radius of the elements down Group 2 from Mg to Ba. Give a reason
for this trend (2) - CORRECT ANSWER Trend: Atomic radius increases (1)
Reason: As you move down a group the number of energy levels increases (1) (which creates
more distance between the nucleus and electrons so the atomic radius increases)
Give an equation, including state symbols, for the reaction of magnesium with steam. State 2
observations for this reaction. (3) - CORRECT ANSWER equation:
Mg(s) + H2O(l) --> MgO(s) + H2(g)
Observation 1: Bright light
Observation 2: Smoke (because magnesium burns)
The sulfates of the element in group 2 from Mg to Ba have different solubilities.
State the formula of the least soluble of these sulfates.
Give a use for this sulfate (2) - CORRECT ANSWER Formula:
BaSO4 (1)
Use:
X-rays (1)
A sample of strontium is made up of only 3 isotopes: 86Sr, 87Sr and 88 Sr.
Practice Exam fully solved Questions &
Updated 2026 (latest version verified
for accuracy) | Already Graded A+ |
Guaranteed Pass | Brand New!!!!!!
Give the full electron configuration of the element in period 3 with the highest first ionisation
energy (1) - CORRECT ANSWER Argon
1s2 2s2 2p6 3s2 3p6
give an equation including state symbols to represent the process that occurs when the second
ionisation energy of sodium is measured (1) - CORRECT ANSWER Na+ (g) --> Na2+ (g) + e-
table 1 shows some successive ionisation energies for an element in period 3. Identify the
period 3 element. Explain your CORRECT ANSWER (3) - CORRECT ANSWER Element: Sulfur (1)
Explanation: big difference between the 6th and 7th ionisation energies (1)
which indicates electron moves from the 2nd energy level which has lower energy (1)
this question is about the elements in group 2.
Describe the structure and bonding of magnesium (2 marks) - CORRECT ANSWER Magnesium
has a lattice of Mg2+ ions. (1)
, There is strong electrostatic attraction between the Mg2+ ions and there are delocalised
electrons in the lattice (1)
state the trend in the atomic radius of the elements down Group 2 from Mg to Ba. Give a reason
for this trend (2) - CORRECT ANSWER Trend: Atomic radius increases (1)
Reason: As you move down a group the number of energy levels increases (1) (which creates
more distance between the nucleus and electrons so the atomic radius increases)
Give an equation, including state symbols, for the reaction of magnesium with steam. State 2
observations for this reaction. (3) - CORRECT ANSWER equation:
Mg(s) + H2O(l) --> MgO(s) + H2(g)
Observation 1: Bright light
Observation 2: Smoke (because magnesium burns)
The sulfates of the element in group 2 from Mg to Ba have different solubilities.
State the formula of the least soluble of these sulfates.
Give a use for this sulfate (2) - CORRECT ANSWER Formula:
BaSO4 (1)
Use:
X-rays (1)
A sample of strontium is made up of only 3 isotopes: 86Sr, 87Sr and 88 Sr.
