Which uses of iron are due to its chemical properties? Select two options.

producing colored sparks in fireworks
changing from liquid to gas at 2,862°C
rusting in the presence of water and oxygen
changing from solid to liquid if heated to 1,538°C
conducting electricity and heat

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.