A student tried to dissolve some iodine crystals in water, but found that they could not dissolve. She used alcohol instead and found out that the iodine crystals dissolve readily in alcohol.

(a) From the above activity, what are the two factors that will affect the solubility of substances?

In the following table, all the columns for the element calcium are filled out correctly. element electron structure of atom electron structure of ion net ionic charge calcium 1s22s22p63s23p64s2 1s32s22p63s23p64s1 +1 true false

Can someone me with 6 to 10 plz this is for masteries test.

Large helium-filled balloons are used to lift scientific equipment to high altitudes. what is the pressure inside such a balloon if it starts out at sea level with a temperature of 10.0ºc and rises to an altitude where its volume is twenty times the original volume and its temperature is – 50.0ºc ?