27) which sample of matter is a mixture? a) h2o(s) b) h2o(g) c) nacl() d) nacl(aq)

How many moles of al3+ ions are in 1.25 moles of al2o3

Identify the correct mole ratio for each substance. sodium chloride (nacl) na: cl = 1: ammonium nitrate (nhno) h: o = 4:

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.