What normally describes what happens when you decrease the temperature of water?
A) The molecules start to vibrate and move farther apart, increasing the density.
B) The molecules start to vibrate and move closer together, increasing the density.
C) The molecular vibrations start to slow and the molecules move farther apart, decreasing the density.
D) The molecular vibrations start to slow and the molecules move closer together, increasing the density.
E) none of the above
Question 2
Evidence for the existence of neutrons did not come until many years after the discoveries of the electron and the proton. Give a possible explanation.
A) The neutron is nearly massless.
B) The neutron is only slightly more massive than the proton.
C) The discovery required the use of ultrafast computers.
D) The neutron lacks an electrical charge.
Some amazing roles of water in biology
Hand Washing Using Soap and Water
Tracing the Source of a Water-Borne Disease
The Greenhouse Effect: Influences on Temperature
Surface molecules involved in the interaction between an antigen-presenting cell and a CD4+ T cell.
The aquaporin water channel