A system is a group of parts that can be
considered one unit. Storm systems, ecosystems,
and our bodies are natural systems. Cars and
houses are human-made systems.
Choose an example of a system, and analyze the
energy flow through the system. Describe in detail
how energy enters the system, how energy
changes form while in the system, and how
energy leaves the system.

you need to give more information

i believe you are right for all except the 3rd ( look at sqdancefan his answer is much better)

"among the transition metal elements, manganese and zinc have a slight lowering of electronegativities. the reason behind this is that the nuclear charges of these elements are slightly weaker than the other transition metal elements due to the way their valence electrons are filled up. both manganese and zinc have their valence electrons filled up to the 4th shell with 1 pair of electrons (4s2) completely occupying it. although the electrons in the 3rd shell (3d) are yet to be paired since the outer most shell is filled up, the ability of the nucleus to attract electrons is lessened. hence,   the electronegativity (or the ability to attract electrons) is lessened."

po-215 i got it right on the quiz