Question

1. Which of the following is true regarding the law of conservation of mass? A It dictates that the number of molecules on each side of a chemical equation must be the same. B It does not apply to chemical reactions. C It dictates that the number of atoms of each element must be the same on both sides of a chemical equation. D It states that the mass of the reactants must remain constant in order for a chemical reaction to proceed.

Answer 1

The correct answer is option C.

Step-by-step explanation:

Law of conservation of mass states that mass can neither be created nor be destroyed but it can only be transformed from one form to another form.

This also means that total mass on the reactant side must be equal to the total mass on the product side that also means the number of atoms of each element must be the same on both sides of a chemical equation.

For example:

`2H_2+O_2\rightarrow 2H_2O`

Number of hydrogen and oxygen atoms on both sides are equal.

Answer 2

C It dictates that the number of atoms of each element must be the same on both sides of a chemical equation.

Step-by-step explanation:

Atoms have mass, so they can neither be destroyed nor created.

Thus, the number of atoms of each element must be the same on both sides of a balanced chemical equation.

A is wrong. Molecules consist of different numbers of atoms, and it is atoms that must be conserved.

B is wrong. the Law of conservation of Mass applies to all chemical reactions.

D is wrong. If the reaction proceeds, the mass of reactants must decrease as they are converted to products.