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3.x Concentration And Rate Analysis (GCSE Chemistry)

The following is a GCSE Chemistry test covering '3.x Concentration And Rate Analysis'
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What happens to the rate of reaction if concentration increases?
Which apparatus could accurately measure gas volume produced in a reaction?
If concentration doubles, what typically happens to reaction rate?
Which term defines a reactant available in greater amounts than needed to react completely?
When graphing reaction rate, the gradient refers to what?
What measurement could indicate the rate of a reaction producing hydrogen gas?
What`s meant by mean rate of reaction?
If the volume of gas produced stays constant towards the end, what does this imply?
Why does increased concentration make reactions faster, according to collision theory?
In rate graphs, how do we identify a rapid initial rate?
Which best describes direct proportionality between two variables?