Answer the following multiple choice questions:
1. to form a solution,
a) one substance must dissolve in another
b) a solid must dissolve in a liquid
c) the solvent must be water
d) a gas must dissolve in a liquid.
2. a salt is dissolved in water, which has a boiling point of 100°c. the boiling point of the solution will be
a) greater than 100°c
b) less than 100°c exactly 100°c
c) exactly 0°c
3. during the formation of a solution, energy is
a) either released or absorbed
b) neither released nor absorbed
c) released only
d) absorbed only
4. a student dissolved equal amounts of salt in equal amounts of warm water, room-temperature water, and ice water. which of the following is true?
a) the salt dissolved most quickly in the warm water.
b) the salt dissolved most quickly in the room-temperature water.
c) the salt dissolved most quickly in the ice water.
d) none of the above

The lights used by mark watley (played by matt damon) during the film the martian seem to be metal halide lamps. metal halide lamps are filled with vaporized mercury and metal-halogen compounds. when an electric current is passed through the lamp, the tube begins to glow a bright white/blue color. if you were to pass this light through a prism to separate the individual light frequencies, you would see a rainbow just as you would if using natural sunlight because of the complexity of the metal halide gas and the vast amount of possible electron transitions. (the study of light in this way is known as spectroscopy and allows astronomers to know exactly what atoms compose distant stars, simply by looking at the light they emit. the spectral lines an atom produces uniquely identifies that atom just like a fingerprint uniquely identifies a person. the momentum equation and energy equation that we have used above can be combined to give the following equation: c = e p where again p is the phonon momentum, e is the photon energy and c is the speed of light. when you divide the photon energy found in #6 by the photon momentum found in #4, do you get the speed of light? (if not, check your work for questions #4 through #6). yes no

Asubmarine has a "crush depth" (that is, the depth at which water pressure will crush the submarine) of 250 m. what is the approximate pressure (water plus atmospheric) at this depth? (recall that the density of seawater is 1025 kg/m3, g = 9.81 m/s2, and 1 kg/(ms2) = 1 pa = 9.8692 10-6 atm.) a. 34.8 atm b. 24.8 atm c. 25.8 atm d. 7.8 atm

Mutt and jeff are running along a path each pushing a cart loaded with rocks. if mutt's wagon has a mass two times greater than jeff's and they want to stay together, arriving at their destination at the same time, what must happen? a) jeff should slow down so mutt can catch up. b) mutt must use half as much force to push his cart. c) mutt must use twice as much force to push his cart. d) mutt and jeff will use the same force, but mutt will take bigger steps.