Question

Which is TRUE of the reactants in this decomposition reaction? 2HgO 2Hg + O2 A. The reactants are a different shape or form of the products.

B. The reactants contain different types of atoms compared to the products.
C. The reactants contain different numbers of atoms compared to the
products.
D. The reactants are the atoms, molecules, or compounds that

participate in the reaction.

Answer 1

answer is D. and it is also the only true answer. 

Answer 2

D) The reactants are the atoms, molecules or compounds that participate in the reaction.

Step-by-step explanation:

Hi, let's review the four afirmaions:

Sentence A) is actually the description of a physical change (for example: water to ice) and not of a chemical reaction. Therefore, there isnt any reactants.

For a reaction equation to be right it should contain the same type of atoms at each side of the equation. Chemical reactions doesn't alter the protons of the elements (except nuclear reactions). It also should contain the same number of atoms at each side of the equation to be balanced.

Being said that, options B) and C) can be tagged as FALSE.

At last, option D) is exactly the definition of a reactant.