An electron microscope is observing detail on a virus down to 5.0 x 10^-9 m. How fast must an electron in the microscope be moving to observe detail this size? (Hint: Due to diffraction effects, an electron's wavelength must be about the same size or smaller than the object being observed.)

50 g of ice at 0°c is dropped in a beaker containing 100 g of water at 0°c. what will be the contents of the beaker after 5 hours? assume that the room temperature is 0°c.

How does the entropy of steam compare to the entropy of ice?

If water vapor with the mass of 35.0 grams is cooled and condensed into water in a closed system such as a closed glass jar, what is the mass of the water after the water vapor completely condenses? a) 34.5 grams b) 35.0 grams c) 35.5 grams d) the mass cannot be determined without knowing the volume