Select the correct answer from each drop-down menu. An ecosystem now receives far less rain than it used to. The weather also became drier and hotter. Over time, plants with structures that helped them to conserve water became more prevalent than plants that didn’t have those structures. From this information, we can conclude that the plants developed ___because of

Calculate the number of kilojoules to warm 125 g of iron from 23.5°c to 78.0°c.

A1.5l container holds p.50 grams of an unknown gas at a pressure of 0.44 atm and a temperature of 50.c what is the molar mass of the unknown gas

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.)