Which reaction represents a synthesis reaction? A. CO₂ → C + O₂ B. Cu + O₂ → CuO₂ C. Zn + CuSO₄ → ZnSO₄ + Cu D. NaOH + HCl → NaCl + H₂O

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.

Abaker touches a pie right after taking it out of the oven. which statement best explains why the pie feels hot?

Silver reacts with oxygen to produce silver oxide. (write balanced chemical equation and identify type of chemical reaction.)