Anickel atom (ni) has a mass numbet of 61. how many neutrons does the atom have

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.

Which of the following substances is the most soluble in water? a. sodium chloride b. methane c. bromine d. carbon

Analyze the reaction to determine whether the reaction is exothermic or endothermic. explain your reasoning.