3. A chemist attempts to determine the surface tension of various detergent-containing liquids by using a tensiometer. In determining the accuracy of the instrument, the chemist tests the
surface tension of pure water and obtains a value of 71.28 dynes cm. The standard value for
surface tension of pure water is 71.97 dynes cm. What is the percent error of the tensiometer?
pls. explain and tell ansrew

Which statement correctly describes a step-up transformer? a. it increases the amount of electric energy available. b. it increases the voltage of an electric current. c. it changes direct current into alternating current. d. it has more loops of wire in its primary coil.

Why is it important always to use horizontal bars in unit fractions when performing unit conversions?

Because air contracts as it cools, the air pressure inside a freezer is typically lower than on the outside. why do ice cubes inside a freezer tend to shrink over time? a. the ice dissolves oxygen from the air, forming a denser crystalline matrix.b. the ice reacts chemically with carbon dioxide in the air, forming gaseous carbon compounds.c. the ice melts, and then the liquid freezes as ice crystals on the bottom of the freezer.d. the ice sublimes, and then the water vapor deposits as ice crystals on the sides of the freezer.