On any given night, provided that the sky is clear, all of the planets which can be seen with the naked eye will not be visible at the same time. This is because they all have different

A) moons
B) orbits
C) shapes
D) sizes

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