Determine the wave number of a line in the infrared spectrum of HBr if the force constant of 1H79Br is 1550 N/m. The atomic mass of 1H is 1.0078 amu, and the atomic mass of 79Br is 78.918 amu.

Joseph has hypothesized that sound travels in waves. if he were following the scientific method, what should he do next? a. ask a question. b. test the hypothesis. c. study the results. d. tell other scientists about his hypothesis.

Chemical energy is a form of a. kinetic energy only. b. both potential and kinetic energy. c. neither potential nor kinetic energy. d. potential energy only. reset

Marcel just purchased 1.69 grams of iron fillings in order to make living putty for his 6 year old niece. how many moles of iron are made in his sample?