Question

1. when two substances react to form one new substance, the mass of the new substance is

drag the answers below into the grey placeholders above
equal to the mass of the two substances combined.
less than the two starting substances combined.
dependent on the reaction.
more than the two starting substances combined.

Explanation:

This is based on the law of conservation of mass in chemistry. In a chemical reaction where two substances combine to form one new substance, the total mass before and after the reaction remains the same.

Answer:

equal to the mass of the two substances combined.