Gas syringe bung
chips
25 cm of dilute
hydrochloric acid
Which channes slow down the rate of reaction?
Decrease the size of pieces of marble chips
Decrease surface area of marble chips
Inercase concentration of acid
Increase temperature of acid

Decrease surface area of marble chips.

Explanation:

Because the reaction goes on the surface  of marble chips, decreasing surface area of marble chips will decrease(slow down) the rate of the reaction.

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14 days is the half-life of phosphorus-32