An example of a chemical change is a) dissolving sugar in water b) sanding wood c) gasoline burning d) melting ice and explain plz so i can rlly learn it !

(apex) when a cup of water is dropped, as the cup falls, the water in the cup falls out true or false?

Using a value of ksp = 1.8 x 10-2 for the reaction pbcl2 pb+2(aq) + 2cl -(aq). if the value of ksp was determined to be only 1.2 x 10-2: too much solid has dissolved. additional precipitate is forming. the solution is unsaturated. the ions are now combining to reduce their concentrations.

As air becomes more dense, (select all that apply) o. air weighs less o. gas molecules are closer together o. air is colder o. air weighs more o. gas molecules are further apart o. air is hotter