Hòa tan hoàn toàn 4,7 gam K2O vào nước được 1000ml dung dịch A. a. Tính pH của dung dịch A.

b. Cho dung dịch A phản ứng với 100ml dung dịch H2SO4 0,05M. Tính pH của dung dịch sau phản ứng.

In which environment would primary succession occur? a forest with a few remaining trees after a recent wildfire an area of exposed rock after a glacier melts away beach that is exposed to the air at low tide an abandoned baseball field in a small town

The twister and runaway train are two coasters at the same amusement park. both coasters start at the same height. the coaster for the twister is twice the mass of the coaster for the runaway train. which roller coaster has greater gravitational potential energy at the start of the ride?

How are evaporation and sublimation similar? a both involve the formation of a gas. b both release energy to the surroundings. c both take place throughout a solid. d both take place at the surface of a liquid.