In each vertical column, or group, of the periodic table, the elements have a. similar chemical and physical properties b. different chemical and physical properties c. similar physical but different chemical properties d. different physical but similar chemical properties

In an oxidation-reduction reaction, oxidation is what happens when a reactant

6. using 3 – 4 sentences explain (in your own words) why water expands when it freezes? 7. using your knowledge of colligative properties explain whether sodium chloride or calcium chloride would be a more effective substance to melt the ice on a slick sidewalk. use 3 – 4 sentences in your explanation.

How is energy related to the change of state represented by the model? atoms gain energy as a solid changes to a liquid. atoms gain energy as a solid changes to a gas. atoms lose energy as a solid changes to a liquid. atoms lose energy as a solid changes to a gas.