If a reversible reaction is at a state of equilibrium, what does this mean?

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If an acid in a reaction becomes more concentrated will the rate of reaction increase or decrease? How do you calculate the average rate of reaction? Why do you draw a tangent on the curve when measuring gradient on a graph? If 80cm^3 of product is used up in 20s what is the rate of the reaction? Give your answer in cm^3/s Describe one way of measuring the rate of a reaction which produces a gas? Explain why a lower reactant concentration causes a decrease in the rate of the reaction. When measuring teh affects of temperature on a reaction why is it important to keep the concentration of the acid the same each time? Define a reversible reaction. What does a steep gradient on a rate of reaction graph show? What does a shallow gradient on a rate of reaction graph show? Define a catalyst. What is a reduction reaction?