2. A 19.27 g sample of a hydrate of calcium carbonate was heated, without decomposing the carbonate, to drive off the water. The mass was reduced to 6.32 g.

What is the formula of the hydrate?
Name the hydrate?

Which of the following best supports the concept that genetic information is passed on to offspring from both of their parents, not just one?

Which type of fossil does this image depict?

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.)