Which statement best describes ph of pure water

Reactions in cells take place at about a. 40°c b. 0° c. 100°c d. 60°c

What happens to the concentration of hydronium ions as the ph of a solution increases? a. hydronium ion concentration stays the same b. hydronium ion concentration decreases c. hydronium ion concentration increases

Why is it incorrect to balance a chemical equation by changing the subscripts? explain.