Hydrogen is a pure substance represented by the chemical symbol h. which of the following best describes hydrogen?

a-hydrogen is a compound made of two or more kinds of atoms.
b-hydrogen is an element made of only one kind of atom.
c-hydrogen is a compound made of only one kind of atom.
d-hydrogen is an element made of two or more kinds of atoms.

Write down two additional questions about earth's magnetic field that will make your presentation more informative.

If you wanted to move an electron from the positive to the negative terminal of the battery, how much work w would you need to do on the electron? enter your answer numerically in joules.

A1500 w electric heater is plugged into the outlet of a 120 v circuit that has a 20 a circuit breaker. you plug an electric hair dryer into the same outlet. the hair dryer has power settings of 600 w, 900 w , 1200 w, and 1500 w. you start with the hair dryer on the 600 w setting and increase the power setting until the circuit breaker trips. under what setting does the circuit breaker trip.