I don't know Im just Trying to get points somehow
Answer: (C) conservation of matter
Solution: Law of conservation of matter or mass states that' total mass of the reactants should always be equal to the total mass of the product that is the total mass is remained conserved in a chemical reaction.
A balanced chemical equation always follow this law.
For example:

Mass of hydrogen = 1 g/mol
Mass of Oxygen = 16 g/mol
Total mass on the reactants = 2(2×1)+(2×16)= 36g/mol
Total mass on the product side = 2[(2×1) +16] = 36 g/mol
As,
Mass on reactant side = Mass on the product side
Therefore, a balanced chemical reaction follows Law of Conservation of mass.
<span>ions are solutions containing ions that react with acids or bases to minimize their effects. </span>
Answer:
The amount/type of stain
Explanation:
You would want to ensure that the stain was the same in both samples.
1. Equal
2. Properties
3. Heat
4. Reverse