A student is investigating the effect of concentration of acid on the reaction between zinc and hydrochloric acid. Why does increasing the
concentration of acid mean that there are more collisions between the
particles? *

See the answer below

Explanation:

Increasing the concentration of the acid means that the number of ions/particles in the reaction vessel has increased. The higher the number of ions/particles, the higher the frequency of collision of these ions provided that the volume of the reactants remains unchanged.

It is just like comparing a densely populated area with a sparsely populated area. You are more likely to encounter people at a higher frequency in a densely populated area when compared to a sparsely populated area.

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