Which are the three most common gases in earths atmosphere PLS HELPPP A. nitrogen, oxygen, and carbon dioxide
B. nitrogen, oxygen, helium
C. nitrogen, argon, and carbon dioxide
D, nitrogen oxygen and argon PLS HELPPP

Scientist wants to react a barium chloride salt with an acid. to speed up the reaction, the scientist crushes the barium chloride salt until it is a fine powder. this speeds up the reaction by a. increasing the ph of the salt. b. increasing the surface area of the salt. c. increasing the pressure of the salt. d. increasing the temperature of the salt. im thinking more a not 100% sure

Which of the following pressures is equal to 760 mm hg? 2.0 atm 101.3 pa 101,300 kpa 101,300 pa

Which type of substance ionizes partially and gives off hydrogen ions when dissolved in water? a. strong acid b. strong base c. weak acid d. weak base