A 250. mL sample of oxygen is collected over water at 25 "C and 760.0 torr pressure. What is the pressure of the dry gas alone? (vapor pressure of water at 25 °C = 23.8 torr)

Which of the following elements is a representative element? a. chromium (cr) b. aluminum (al) c. mercury (hg) d. silver (ag)

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.

The formation of a solid, also known as a is an indication of a chemical change. precipitate particulate particle powder