Who was the first person to describe a chemical reaction as the recombination of atoms?

Consider the following system at equilibrium. caco3(s) ca2+(aq) + co32–(aq) the addition of which compound will cause a shift in equilibrium because of a common ion effect? ccl4 co2 cuso4 na2co3

The clouds are grey and ground is wet. a quantitative b qualitative

What shape would a molecule with two bound groups and two lone pairs have?