How many structural isomers does C3H8 have?
a. five
b. three
c. two
d. one

How will the volume of a gas be affected if the pressure is tripled, but the temperature remains the same?

How can parts of a solution be separated by chromatography?

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.