8. Balance the Equation: H2O2 → __ H2O +
H2O + _O2
1->1+1
1->2+1
O
2->2+3
O
2->2+1

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.

Question 3(multiple choice worth 4 points) (04.04 lc) what does it mean when an element is reduced? it empties a valance shell, reducing its atomic radius. it gains electrons, reducing its overall charge. it increases electronegativity, reducing its ability to bond. it loses electrons, reducing its electron number.

Δu of , in kj/kg, as it isto k, (a)as a of , (b) at , (c) at .