Calculate the energy released by a burning sample of fuel if the temperature of 100g of water was raised by 20 degrees. 4200j/kg

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.