Can somebody help this is like a cross word puzzle thing but I have no clue what the words are so if you know just any of this to answer it would be appreciated. remember if you answer with the word tell me if its across or down please! 20 points!

For each of the following types of reactions, write a general reaction formula in the symbolic form—for example, a + b → ab. single-displacement double-displacement synthesis decomposition

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.

What is the mass defect of a mole of nuclei with 1.8 x 10^15 j/mol binding energy?