The ground receives more light (heat) from the sun when: the light rays are directly overhead in the summer
the light rays are slanted in the winter
the light rays are slanted in the summer
the light rays are directly overhead in the winter

How can you improve the percent yield of copper in this lab? check all possible strategies that will you do so. measure reactants precisely. stir to the reaction take place. chill the reactants before combining them. wait patiently until the reaction completes. make sure to recover as much copper as possible.