To 1.00 l of water was added 2.00 g of solid barium carbonate, baco3. after stirring, it was found that the solid did not dissolve completely.
a) calculate which mass of baco3 has dissolved.
b) check that at ph = 4 the added mass of barium carbonate would dissolve completely.
data: pkps (baco3) = 8.3; pka1 (h2co3) = 6.35; pka2 (h2co3) = 10.33; mr(ba) = 137.3; mr(c) = 12.0; mr(o) = 16.0

When a spring is compressed, the energy changes from kinetic to potential. which best describes what is causing this change?

Oxidation-reduction reactions (often called "redox" for short) are reactions that involve the transfer of electrons from one species to another. oxidation states, or oxidation numbers, allow chemists to keep track of these electron transfers. in general, one element will lose electrons (oxidation), with the result that it will increase in oxidation number, and another element will gain electrons (reduction), thereby decreasing in oxidation number. the species that is oxidized is called the reducing agent or reductant. the species that is reduced is called the oxidizing agent or oxidant. to sum up: oxidation = increase in oxidation state = loss of electrons = reducing agent reduction = decrease in oxidation state = gain of electrons = oxidizing agent part a which element is oxidized in this reaction? fe2o3+3co→2fe+3co2 enter the elemental symbol. view available hint(s) is oxidized part b which element is reduced in this reaction? 2hcl+2kmno4+3h2c2o4→6co2+2mno2+2kcl+4h2o enter the elemental symbol. view available hint(s) is reduced

How have the greenhouse gasses increased from the year 2000 to 2018