Here, we are required to determine which procedure could be used to demonstrate that matter is conserved during a chemical change or reaction.
The Correct answer is option A.
First, a chemical change is one in which a chemical compound is transformed into one or more chemical substances and consequently, the resulting compounds have different chemical properties as their atoms are arranged differently.
From the definition above, it is evident option A where an acid and a base are reacted together to form water and salt is an example of chemical change and obeys the law of conservation of matter.
This is so because, upon first measuring the mass of the acid and base separately and then measuring the mass of the resulting salt and water.
The mass in both instances is constant.
- Therefore, the correct answer is option A
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