Anail rusts when the iron in the nail reacts very slowly with oxygen to form a new substance and heat. this is an example of a(n) reaction.
a. fusion
b. fission
c. exothermic
d. endothermic

Who discovered a pattern to the elements in 1869?

The density of benzene at 15 °c is 0.8787 g/ml. calculate the mass of 0.1500 l of benzene at this temperature. enter your answer in terms of grams

Which best describes the activation energy of a chemical reaction? a. the combined energy of all the reactants b. the amount of energy required for a reaction to occur c. the difference in energy between products and reactants d. the potential energy stored in the bonds of reactants and products