The b vitamins:
a) facilitate chemical reactions that yield energy from the macronutrients.
b) protect the cells from damage by free radicals.
c) can be broken down to yield about 4 kilocalories per gram.
d) provide strength and stability to bones.

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in a chemical reaction, the atoms and molecules produced by the reaction are called products. no new atoms are created, and no atoms are destroyed. in a chemical reaction, reactants contact each other, bonds between atoms in the reactants are broken, and atoms rearrange and form new bonds to make the products.

1) a

2)c

3)a

4)c

5)b

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