Student grades on a chemistry exam were: 77, 78, 76, 82, 86, 51, 79, 81, 83, 99 Part (a) Construct a stem-and-leaf plot of the data. (Use the tens digit as the stem and the ones digit as the leaf. Enter your answers from smallest to largest, separated by spaces. Enter NONE for stems with no leaves.) 5 6 7 8 9

Which statement best describes the relationship between period and frequency of light waves? a) in wave b the period increases and the frequency decreases from wave a. b) in wave a the period increases and the frequency decreases from wave b. c) in wave b the period is shorter and the frequency is greater than in wave a. d) in wave a the period is shorter and the frequency is greater than in wave b.

Frictional forces acting on an object are often converted into energy, which causes the temperature of the object to rise slightly.

If 3 moles of a compound use 24 j of energy in a reaction, what is the a hreaction in j/mol?