In the process of cellular respiration, humans create carbon dioxide, water, and energy in the form of ATP from oxygen they breath and glucose found in the food they eat. Is this a chemical or physical change? physical

chemical

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.