LATEST GCSE AQA Triple Chemistry Paper 1 2024/2025 QUESTIONS AND CORRECT ANSWERS ALREADY PASSED

C8 1) What is required for a reaction to happen? - answer a successful collisions C8 2) How can you use a graph to calculate the rate of reaction? - answer calculate gradient (on a curve tangent) C8 3) What four things can speed up the rate of reaction? - answer temperature, concentration, surface area and catalyst C8 11) What formula is used to calculate the rate of reaction? - answer amount of product used or amount of product formed / time C8 12) What would a line with negative gradient look like? - answer line would go down C8 4) What 3 methods can be used to find out the rate of reaction? - answer measure colour change / measure volume of gas produced / measure change in mass C8 4) How can you increase the rate of reaction? - answer increase collisions / increase energy C8 8) How does increasing surface area increase the rate of reaction? - answer larger surface area quicker reaction rate C8 14) Why is the rate of reaction increased if you crush up solids? - answer larger surface area quicker reaction rate C8 13) What is the minimum amount of energy that particles must have before they react call? - answer activation energy C8 15) How do you increase the surface area of a solid? - answer crush it C8 5) Put these in order of larger surface area - small , medium and large marble chips - answer small C8 5) How does temperature increase the rate of reaction? - answer more energy / move quicker / collide more frequently - more successful collisions C8 6) When increasing the temperature, at the end of the reaction why is no more product made? - answer temperature does not affect amount of product made C8 6) How does concentration increase the rate of reaction? - answer more particles = more collisions C8 7) How does pressure increase the rate of reaction? - answer same number of particles but in a smaller space so more frequent collisions C8 16) How do you investigate the effect of changing concentrations? - answer by reacting marble chips with differnet concentrations of hydrochloric acid C8 17) State three ways you can measure the rate of reaction? - answer measure colour change / measure volume of gas produced / measure change in mass C8 9) How do catalysts speed up the rate of reaction? - answer lower the activation energy by providing alternative pathway for reaction without being used up. C8 10) Give an example of a biological catalyst. - answer Enzymes that break down proteins into amino acids. C8 18) Why are catalysts important in industry? - answer save money as otherwise you'd have to work at high temperatures and pressures / save environment C8 19) Why are catalysts often used as powders? - answer increase their surface area to volume ratio. Speed up collisions C8 20) True or false: the catalyst does not get used up in the reaction - answer true C8 21) True or false: you can use the same catalyst for all reactions - answer false C8 22) What is a reversible reaction? - answer the products of the reaction can react to make the orignal reactants C8 23) How can you represent a reversible reaction - answer C8 24) Give an example of a reversible reaction - answer ammonium chloride to ammonia and hydrogen chloride, hydrated copper C8 25) What is the relationship between the amount of energy transferred in each direction of a reversible reaction? - answer it is the same C8 26) In a reversible reactoin, if one reaction is exothermic the other reaction is? - answer endothermic C8 27) In a reversible reaction, if one reaction is endothermic the other reaction is? - answer exothermic C8 28) What do we mean by equilibrium? - answer the reactants are making products at the same rate the products are making reactants - no change in amount of products and reactants C8 29) what happens when you start with just the reactants and a reversible reaction in a closed system? - answer it reaches equlibrium C8 36) How does decreasing concentration affect an equilibrium? - answer shifts to add what has been added C8 35) How does increasing concentration affect an eqiulibrium? - answer shifts to get rid of what has been added C8 30) What is Le Chatelier's Principle? - answer whenever you introduce a change in conditions to a system at equilibrium, the position of equilibrium shifts to cancel out the change C8 31) How does increasing pressure affect an equilibrium? - answer shifts to decrease pressure - reaction shifts in favour of producing less gas particles C8 32) How does increasing temperature affect an equilibrium? - answer favours the endothermic reaction C8 33) How does decreasing temperature affect an equilibrium? - answer favours the exothermic reaction C8 34) How does decreasing pressure affect an equilibrium? - answer shifts to increase pressire - reaction shifts in favour of producing more gas particles C9 1) What is crude oil? - answer many different compound - mostly hydrocarbons C9 2) What are hydrocarbons? - answer compounds that only contain hydrogen and carbon C9 3) What are alkanes? - answer saturated hydrocarbons C9 4) What is the general formula for a alkane? - answer CnH(2n+2) C9 5) What is the names of the first four alkanes? - answer methane. Ethane, propane and butane C9 6) What is the formula for methane? - answer CH4 C9 7) What is the formula for ethane? - answer C2H6 C9 8) What is the forumale for propane? - answer C3H8