If your experiments are not close to each other within experimental uncertainty, perform the experiment again taking steps to improve your design or think of the assumptions you made about the collision – are they valid in this case?

i think the answer is a, hope this : )

part 1: which substance has a higher solubility?

a

smallest amount left undissolved atall temps in table shown most has dissolved high sol'by

the answer is false. this is because for ice to melt, it requires latent heat of melting. latent heat means heat energy required to change phase without any increase in temperatures. therefore, the ice will take energy from the environment to melt hence atmospheric temperatures will reduce.