Reacționează 40g HCl de concentrație 36,5% cu 20g soluție hidroxid de calciu de concentrație 37%(Se dau masele atomice H=1;Cl=35,5;Ca=40;O=16).Substanța în exces este:

Which of the following electromagnetic waves can create ions?

Why does earth rotate? because earth is formed from cold gases collapsing due to gravity because the matter in the nebula that formed earth was spinning because earth forms more than 99% of the mass of the solar system because the hydrogen atoms inside the nebula fused to form helium

At 20°c, a sample of h2o liquid and a sample of co2 gas each have the same average kinetic energy. why is one a liquid and the other a gas at this temperature?