The density of an element is 19.3 g/cm^3. what is its density in kg/m^3?

Match the mixture with the substance// i really need on this guys (it’s a pic btw)

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 is an example of a reversible physical change?