How is a scientific model helpful to the brain for relaying a scientific concept?

Is this a single replacement reaction or there is no

In an exothermic reaction, energy may be released to the surroundings in the form of question 4 options: heat light thermal all of the above

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