Calculate the pH of a buffer that is 0.035 M HF and 0.035 M NaF. The Ka for HF is 6.8×10-4.

Which of the following is most likely true about water in chemical systems? a) water dissolves nonpolar ionic compounds. b) water dissociates ionic compounds. c) water dissociates covalent molecules. d) water dissolves nonpolar covalent substances.

Which of the following is true about the speed of light? it depends on the wavelength.

Which scientists contributed to the determination of how cfcs in clouds in the upper atmosphere could destroy ozone molecules