An element has two isotopes: mass 10 (20%) and mass 11 (80%). Calculate its relative atomic mass.
From Paper 1, Higher
23 marks
Explain why metals are good conductors of electricity and can be bent.
From Paper 1, Higher
33 marks
Calculate the mass of carbon dioxide produced when 10 g of calcium carbonate is heated.
CaCO₃ → CaO + CO₂ (Mr CaCO₃ = 100, CO₂ = 44)
From Paper 1, Higher
102 marks
Explain why isotopes of an element have the same chemical properties.
From Paper 1, Higher
113 marks
Explain why alloys are harder than pure metals.
From Paper 1, Higher
123 marks
Calculate the mass of carbon dioxide produced when 25 g of calcium carbonate is heated.
CaCO₃ → CaO + CO₂ (Mr CaCO₃ = 100, CO₂ = 44)
From Paper 1, Higher
181 mark
What is the electronic structure of a sodium atom?
From Paper 1, Higher
193 marks
Explain why nanoparticles may have different properties from the same material in bulk, and give one use and one risk.
From Paper 1, Higher
203 marks
4.8 g of magnesium burns completely in oxygen. Calculate the mass of magnesium oxide formed. 2Mg + O₂ → 2MgO (Ar Mg = 24, O = 16)
From Paper 1, Higher
263 marks
Explain why Mendeleev left gaps in his periodic table and how he was proved right.
From Paper 1, Higher
272 marks
A cube of side 10 nm. Calculate its surface area to volume ratio.
From Paper 1, Higher
283 marks
7.2 g of magnesium burns completely in oxygen. Calculate the mass of magnesium oxide formed. 2Mg + O₂ → 2MgO (Ar Mg = 24, O = 16)
From Paper 1, Higher
342 marks
The radius of an atom is about 0.1 nm and the nucleus is about 1 × 10⁻¹⁴ m. How many times larger is the atom than the nucleus?
From Paper 1, Higher
352 marks
A cube of side 100 nm. Calculate its surface area to volume ratio.
From Paper 1, Higher
363 marks
Calculate the atom economy for making hydrogen by the reaction CH₄ + H₂O → CO + 3H₂. (Mr: CH₄ 16, H₂O 18, CO 28, H₂ 2)
From Paper 1, Higher
381 mark
Which particle has a relative mass of almost zero?
From Paper 2, Higher
62 marks
The theoretical yield of a reaction is 12.0 g. The actual yield is 8.5 g. Calculate the percentage yield and give one reason why it is less than 100%.
From Paper 2, Higher
71 mark
Which substance has a giant covalent structure?
From Paper 2, Higher
132 marks
The theoretical yield of a reaction is 40.0 g. The actual yield is 34.2 g. Calculate the percentage yield and give one reason why it is less than 100%.
From Paper 2, Higher
143 marks
Describe the structure of graphene and fullerenes and give a use of each.
From Paper 2, Higher
202 marks
5.85 g of solute is dissolved to make 250 cm³ of solution. Calculate the concentration in g/dm³.
From Paper 2, Higher
213 marks
Draw a dot-and-cross diagram for a water molecule and describe the bonding.
From Paper 2, Higher
262 marks
4.0 g of solute is dissolved to make 500 cm³ of solution. Calculate the concentration in g/dm³.
From Paper 2, Higher
272 marks
Work out the formula of the ionic compound formed between aluminium ions (Al³⁺) and oxide ions (O²⁻).
From Paper 2, Higher
324 marks
25.0 cm³ of sodium hydroxide solution was neutralised by 20.0 cm³ of 0.150 mol/dm³ hydrochloric acid. Calculate the concentration of the sodium hydroxide in mol/dm³. NaOH + HCl → NaCl + H₂O
From Paper 2, Higher
333 marks
Explain the limitations of dot-and-cross and ball-and-stick models.
From Paper 2, Higher
373 marks
Calculate the volume of hydrogen gas at room temperature and pressure produced when 0.48 g of magnesium reacts with excess acid. Mg + 2HCl → MgCl₂ + H₂ (1 mole of gas occupies 24 dm³)
Score 0 / 66 · 0 of 27 marked
This paper is written by Plasmo in the style of the Edexcel GCSE Chemistry exam. It is not a past paper and is not produced or endorsed by the exam board.