Suppose that water is used in a thermometer instead of mercury. If the temperature is at 4C and then changes, why can't the thermometer indicate whether the temperature is rising or falling?
A) The water molecules will be a mixture of ice and water, and a change in temperature will only change the proportions of its phases.
B) The water molecules are moving too slowly to be able to indicate a change.
C) Water is most dense at 4C. The water in a water-filled thermometer at 4C would expand as the water was cooled or heated.
D) Since water has such a high specific heat capacity, it will take a lot of energy to be able to see a change in the thermometer.
Question 2
According to the following reaction, which molecule is acting as a base? H3O+ + HSO4- H2O + H2SO4
A) H2SO4
B) H2O
C) H3O+
D) HSO4-
E) none of the above
Question 3
Why does adding heat to ice-water disfavor the rate of ice formation?
A) Heat increases the vibration of the water molecules, which breaks the hydrogen bonds.
B) When heat is added, the water molecules are moving too fast to form hydrogen bonds, which gives it the structure that we call ice.
C) Adding heat favors the rate of melting, as more hydrogen bonds are broken than formed by the ice in the ice-water.
D) all the above
The discovery of aquaporins, water channels made of a transmembrane protein.
The Water Cycle
Hydrogen bonding of water with itself and with other compounds
Annual Water Use in the United States
Measuring Pressure: Mercury Barometers
Thermodynamic Diagrams and Vertical Temperature Profiles