Explain why the reactivity of Group 1 metals increases down the group.
24 marks
Use collision theory to explain why increasing temperature increases the rate of reaction.
33 marks
Explain the difference between exothermic and endothermic reactions, with an example of each.
44 marks
Describe how the Earth's early atmosphere changed to form today's atmosphere.
54 marks
Describe how crude oil is separated by fractional distillation.
63 marks
Describe what you would see when potassium is added to water and write a balanced equation.
72 marks
60 cm³ of gas was collected in 30 s. Calculate the mean rate of reaction.
84 marks
Use the bond energies (kJ/mol) H–H 436, Cl–Cl 243, H–Cl 432 to calculate the energy change for H₂ + Cl₂ → 2HCl.
96 marks
Evaluate the evidence that human activities are causing climate change.
103 marks
Explain why cracking is carried out.
114 marks
Explain why chlorine displaces bromine from potassium bromide solution and write an ionic equation.
122 marks
45 cm³ of gas was collected in 25 s. Calculate the mean rate of reaction.
134 marks
Use the bond energies (kJ/mol) H–H 436, O=O 498, O–H 464 to calculate the energy change for 2H₂ + O₂ → 2H₂O.
143 marks
Explain how carbon monoxide and sulfur dioxide are formed when fuels burn and the problem each causes.
152 marks
Complete the cracking equation C₁₀H₂₂ → C₈H₁₈ + ___
162 marks
Explain why the noble gases are unreactive.
173 marks
Explain how a catalyst increases the rate of a reaction.
183 marks
Sketch and describe a reaction profile for an exothermic reaction.
Finished?
Answer every question to finish (18 left), or finish when the time’s up.
Score 0 / 60 · 0 of 18 marked
This paper is written by Plasmo in the style of the Edexcel GCSE Combined Science exam. It is not a past paper and is not produced or endorsed by the exam board.