In terms of energy, how would you classify the following chemical reaction? 2cuo + 315 kj → 2cu + o2
a. exothermic
b. endothermic
c. both endothermic and exothermic
d. neither endothermic nor exothermic

No copying 15 pts how does a free-body diagram tell you about the net force on an object?

How do you know when a chemical reaction has occurred

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.)