Why is trapped air a good insulator? a. it stops heat transfer. b. it is actually a poor insulator. c. it reduces heat transfer. d. it increases heat transfer.

Aplane travels 1000 miles in 5 hours .what is the planes average speed?

Which of the following is the main energy source for the sun? a. fission of hydrogen b. fusion of hydrogen c. fusion of helium d. fission of iron

Sodium chloride, nacl, is formed when a sodium atom transfers its electron to a chlorine atom. the difference in charge between the two atoms creates a(n) attraction that bonds them together.