Why does a higher temperature have more of an effect on materials during chemical weathering

Asample of aluminum foil contains 8.60 × 1023 atoms. what is the mass of the foil?

How many moles of bromine are needed to produce 3.23 moles of potassium bromide

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.)