Were the reactions in Part C endothermic or exothermic? How did you know that the reactions were endothermic or exothermic? Why was it necessary to use two different concentrations of HCl in the reactions?

What is the molar mass of potassium nitrate, kno3

Which of the following is an example of physical change not a chemical change? a) a log gives off heat and light as it burns. b) a tree stores energy from the sun in its fruit. c) a penny lost in the grass slowly changes color. d) a water pipe freezes and cracks on a cold night.

In a copper wire, a temperature increase is the result of which of the following