What happens to the volume of a gas
inside a cylinder if the temperature
does not change but the pressure is
reduced?
a. The volume of the gas increases.
b. The volume of the gas stays the
same.
c. The volume of the gas decreases.
d. There is not enough information
to determine the answer.

Which position represents spring in the southern hemisphere? a) b) c) d)

The number to the right of an element's symbol (ex. c-12) identifies the of an isotope.

For a research project, a student decided to test the effect of the lead(ii) ion (pb2+) on the ability of salmon eggs to hatch. this ion was obtainable from the water‐soluble salt, lead(ii) nitrate, which the student decided to make by the following reaction. pbo(s) + 2 hno3(aq) → pb(no3)2(aq) + h2o losses of product for various reasons were expected, and a yield of 86.0% was expected. in order to have 5.00 g of product at this yield, how many grams of pbo should be reacted? (assume that sufficient nitric acid, hno3, would be used.)