When a substance goes directly from a solid state to a gaseous state?

50 pts plz what is the physical state of matter of baking soda.

Which characteristics can be used to differentiate star systems? check all that apply.

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.