Question
If a reaction appears to result in a change of mass, it is usually because a reactant or product that is a __ has not been taken into account. What word completes the sentence?
Answer
4.6
(328 Votes)
Lionel
Master · Tutor for 5 years
Answer
gas
Explanation
This question is asking for a word that completes a sentence about a reaction that seems to result in a change of mass. In a chemical reaction, the law of conservation of mass states that the mass of the reactants (the substances that react) should be equal to the mass of the products (the substances that are produced). If there appears to be a change in mass, it's typically because a reactant or product that is a gas has not been considered. Gases can easily escape or be added to a reaction, which can make it seem like the mass has changed.