What is the pH of an aqueous solution with [H3O+] = 6×10−12 M ?

Which substances have the lowest melting points: ionic covalent, or metallic

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.

Use examples from the article to explain one positive and one negative effect that chemistry has had on society.