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Higher Combined Science - Chemistry paper 2(AQA GCSE 9-1) Pro Test Questions With Solved Solutions. $9.99   Add to cart

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Higher Combined Science - Chemistry paper 2(AQA GCSE 9-1) Pro Test Questions With Solved Solutions.

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  • Course
  • Combined Science
  • Institution
  • Combined Science

what is a rate of reaction? - Answer the speed of a reaction what is the equation for rate of reaction? - Answer quantity of reactant used up/time taken or quantity of product formed/time taken what unit do we normally use for time? - Answer seconds what unit do we normally use ...

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  • October 25, 2024
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  • Combined Science
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Higher Combined Science - Chemistry
paper 2(AQA GCSE 9-1) Pro Test
Questions With Solved Solutions.

what is a rate of reaction? - Answer the speed of a reaction



what is the equation for rate of reaction? - Answer quantity of reactant used up/time taken

or

quantity of product formed/time taken



what unit do we normally use for time? - Answer seconds



what unit do we normally use for mass? - Answer grams



what unit do we normally use for a rate of a reaction? - Answer grams/second



you can also measure a rate of a reaction using ... - Answer a graph



how do you calculate the gradient? - Answer change in y/change in x



what key factors affect the rate of reaction? - Answer temperature

pressure

concentration

surface area

catalysts



what happens to the rate as you increase the temperature? - Answer the rate increases

, what is concentration a measurement of? - Answer the number of particles dissolved in a given volume
of solvent



what is pressure a measurement of? - Answer the number of particles in a given volume of gas



what happens to the rate of a reaction when you increase its pressure or concentration? - Answer it
increases



what happens to a rate of reaction when you increase its surface area? - Answer it increases



what is a catalyst? - Answer a substance that speeds up a chemical reaction without being used up



how do a catalyst work? - Answer it decreases the activation energy that a reaction needs



what is the collision theory? - Answer chemical reactions can only take place if reaction particles collide
into each other with sufficient energy



what happens when the concentration, pressure or surface area is increased? - Answer the frequency
of collisions increases so the rate of reaction also increases



what happens when the temperature is increased? - Answer the frequency of collisions increases and
are made more energetic so the rate of reaction increases



what is a reversible reaction? - Answer where the products of a reaction can react again and produce
the original reactants



what is equilibrium? - Answer when the forward and reverse reactions happen at exactly the same rate



what is the le chateliers principle? - Answer if a system is at equilibrium and a change is made to the
conditions the system responds to counteract the change

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