Which of the following molecules contain double covalent bonds?
a) ammonia
b) carbon dioxide
c) hydrogen chloride
d) methane

Which of the following is an example of how telecommunication devices people do their jobs? a.) a security guard checks the time using a digital watch. b.) a banker does some quick math using a solar calculator. c.) a nurse uses a digital thermometer to take a patient’s temperature. d.) a construction worker reports in to his office using a cell phone.