When the temperature of the gas changes from cold to hot, the amount of pressure is
a.

decreasing

c.

stays constant
b.

increasing

d.

none of the above

Energy is released during which phase changes? check all that apply. boiling condensing depositing freezing melting subliming

If the density of water is 1.0 g/cm3, which of these materials would float in water, based on their densities? check all that apply. aluminum cork iron lead wax

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