Answer:
Because it lose detectable mass.
Explanation:
Law of conservation of mass states that substances involved in chemical reaction do not lose or gain any mass. So the above reactions don't demonstrate the law of conservation of mass because it lose mass
Answer:
Repulsion Forces create the bent triatomic shape of a water molecule.
Answer: Hence, 2 moles of NaOH would neutralize 1 mole of 
Explanation:

One mole of hydrochloric acid neutralizes one mole of sodium hydroxide to give one mole of sodium chloride and one mole of water
When sulfuric acid is used in the place of HCl , 1 mole of sulfuric acid will neutralizes the 2 mole of sodium hydroxide and gives one mole of sodium sulfate and 2 moles of water. As we can see from the reaction:

Hence, 2 moles of NaOH would neutralize 1 mole of 
Answer:
B
Explanation:
The mechanism of this process: the electrolytic cell converts the electrical energy to chemical energy, using external energy source.