If some unknown solid weighs 84.0 grams and occupies 30.0 cm3 of space, what is its density?

Why is the melting of ice a physical change ?

Describe the properties of sodium, chlorine, and sodium chloride

The reaction below shows a system in equilibrium. how would a decrease in temperature affect this reaction? a. the rate of formation of the gases would increase. b. the equilibrium of the reaction would shift to the left. c. the equilibrium would shift to cause the gases to sublime into solids. d. the chemicals on the left would quickly form the chemical on the right.