Which coefficient is needed in front of NaNO3 to balance the equation Na2S + Zn(NO3)2 – ZnS + _NaNO3? O 1
O 2
O 5
O 7

What produces wave a)sound b) heats c)transfer of energy d)vibrations

Some liquids can be distilled, but only at temperatures that are so high that it is impractical, or so high the compound decomposes. explain why distillation such compounds at significantly less than atmospheric pressure (some degree of vacuum) would solve this problem.

In which region is the substance in both the solid phase and the liquid phase? 1 2. 3 4 mark this and return save and exit next