Calcium carbonate reacts with hydrochloric acid to form carbon dioxide.
Which changes would slow this reaction down?
1 decreasing the concentration of hydrochloric acid
2 decreasing the particle size of calcium carbonate
3 decreasing the temperature
13 onlu
2 and 3 onlu
1, 2 and 3

the answer to your question is c.

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b is the correct answer

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you need to have a picture of the atom that way we can answer it

nuclear fission produces elements that are heavier than helium.

the elements that are used in nuclear fission and their products are much heavier than helium.