How many grams of a 7.50% by mass calcium nitrate solution are needed to obtain 3.75 grams of calcium nitrate ?

12. calculate the hydroxide ion concentration of a solution with ph = 3.25. show all calculations leading to an answer

What type of matter is made of only one kind of atom

The equation below shows a chemical reaction. a + b + heat —> c + d according to the law of conservation of energy, which statement is true? a. the reactants absorb heat because they have less energy than the products. b. the products release heat because they have more energy than the reactants. c. the reactants generate heat because they have more energy than the products. d. the products require heat to form because they have less energy than the reactants.