Hello I need ur guys help on my test its my last take opportunity and I did most of it but some im stumped on so please... put a real answer I only have 16 points left and its due tonight at 11:59pm and I have to go to bed in an HOUR HEELP ME PLZ

How would the number of moles (n) of o2 change if the atmospheric pressure doubled but all other variables stayed the same

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.

Inside a flashbulb, oxygen surrounds a thin coil of magnesium. when the flashbulb is set off, a chemical reaction takes place in which magnesium combines with oxygen to form magnesium oxide. which of the chemical equations matches the reaction above? a. mg + o2 mgo2 + energy b. 2mg + o mg2o + energy c. 2mg + o2 2mgo + energy d. mg + o mgo + energy