1
Question Marble chips (calcium carbonate) react with hydrochloric acid in an exothermic
reaction.
calcium carbonate + hydrochloric acid – calcium chloride + water + carbon dioxide
When excess marble chips are added to dilute hydrochloric acid the rate of the reaction starts
off fast, then gets slower until the reaction stops.
Why does the reaction rate get slower?

a. The concentration of the hydrochloric acid is decreasing.

b. The concentration of calcium chloride is increasing.

c. The calcium carbonate is completely used up.

d. The temperature of the mixture decreases.

c most likely

hop this let me know if it is wrong

nanotechnology is a powerful tool in biomaterials research as it creates numerous possibilities for the engineering of functional molecules. nano-bio refers to projected ability to incorporate biomimicry into various materials at nanoscale.  

answer:

the reaction is type of combination reaction.

explanation:

on the product side, there are 2 molecules of bonded to fe   which means one atom of fe are combined two molecules of . so, balanced chemical equation becomes :

this reaction follows the reaction type of combination reaction. a combination reaction is defined as chemical reaction in which reactants combines together to form a single product.

the answer is c.the valence of the atoms combine .