GCSE Chemistry C8 Study Guide Exam And Complete Answers 2024.
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Course
GCSE Chemistry
Institution
GCSE Chemistry
What is the rate of reaction? - Answer How fast reactants turn into products
What is reaction rate important in? - Answer The chemical industry and your body
Why is reaction rate important in the chemical industry? - Answer To make sure products are made quickly and cheaply
What are ...
GCSE Chemistry C8 Study Guide Exam And Complete Answers 2024.
What is the rate of reaction? - Answer How fast reactants turn into products
What is reaction rate important in? - Answer The chemical industry and your body
Why is reaction rate important in the chemical industry? - Answer To make sure products are made quickly and cheaply
What are the two ways you can work out the rate of a chemical reaction? - Answer How quickly the reactants are used up and how quickly the products are made
What are the three techniques you can use to get the rate of a reaction? - Answer Measuring the decreasing mass of a reaction mixture, measuring the increasing volume of a gas given off and measuring the decreasing light passing through a solution
How can you calculate the rate of a reaction at a given time? - Answer Drawing a tangeant to the curve at that point, constructing a right angled triangle and calculating the gradient
How can you calculate the mean rate of reaction after a given time? - Answer quantity of reactant used or quantity of product formed / time
What are the four main factors which affect the rate of chemical reactions? - Answer Temperature, surface area of solids, concentration of solutions or pressure of gases and the presence of a catalyst
What is collision theory? - Answer The reacting particles do not only have to bump into each other but also need to colldie with enough energy to cause a reaction to take place
What is activation energy? - Answer The minimum amount of energy that particles must have before they can react What are the two ways reactions are more likely to happen between reactant particles? - Answer By increasing the frequency of reacting particles colliding with each other and increasing the energy you have when they collide
You can compare solids wth different surface areas quantitatively by looking at their _____ - Answer surface area to volume ratio
Why is food cooled? - Answer To slow unwanted chemical reactions
What are the two reasons why raising temperature increases the rate of reaction? - Answer Particles collide more often and particles collide with more energy
What happens when particles collide more frequently? - Answer There are more chances for them to react, increasing the rate of reaction
Particles that are moving around more quickly have more ___ - Answer energy
What has a greater effect on the rate of reaction than the increased frequency of collisions? - Answer An increased proportion of particles exceeding the activation energy
Why does increasing the concentration of reactants in a solution increase the rate of reaction? - Answer Because there are more particles of the reactants moving around in the same volume of solution.
What does increased pressure do to the rate of reaction? - Answer It squashes gas particles more closely together, increasing the chance they will collide and react
How can you investigate the effect of changing concentration? - Answer By reacting marble chips with different concentrations of hydrochloric acid
How would you find the rate of reaction when reacting marble chips with hydrochloric acid? - Answer By plotting the volume of carbon dioxide gas given off as the reaction progresses over time
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