Which is an example of a chemical reaction?

a)
melting ice

b)
rusting iron

c)
water evaporating

d)
rubbing a marker on paper

Which of the dna typing techniques do you think you would choose if you had to analyze a dna sample? why?

Drag each label to the correct location on the chart. classify each reaction as endothermic or exothermic.

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.