Simple question but why do some elements in an equation have parenthesis around them? Do they have any use?
(Why does OH have a parenthesis around it?)

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.

The atoms of a solid aluminum can are close together, vibrating in a rigid structure. if the can is warmed up on a hot plate, what happens to the atoms?

In which region is the substance in both the solid phase and the liquid phase? 1 2. 3 4 mark this and return save and exit next