One gigahertz (ghz) equals how many ticks of the system clock per second? a. one thousand b. one million c. one billion d. one trillion

Chemical energy is a form of energy. a. heat b. kinetic c. potential d. electromagnetic

What are the north and south poles of a solenoid change with?

Iron is a transition metal with multiple oxidation numbers. (answer the following) a. what is the iron (ii) ion? how does it differ from the iron (iii) ion? b. if iron were to bond with oxygen, predict the formula for each oxidation number of iron. c. how would each formula be named?