Which of the following sets contains a substance that could not be used as an acid-base indicator? a. set 1: a weak acid b. set 2: a weak base c. set 3: a weak acid and a weak base d. set 4: a weak acid and a strong base

In which region is the substance in both the solid phase and the liquid phase? 1 2. 3 4 mark this and return save and exit next

To prevent the presence of air, noble gases are placed over highly reactive chemicals to act as inert "blanketing" gases. a chemical engineer places a mixture of noble gases consisting of 4.37 g of he, 13.36 g of ne, and 36.65 g of kr in a piston-cylinder assembly at stp. calculate the partial pressure in torr of kr.

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.