The equation below shows a general equation for a reaction, and the amounts of the substance are written underneath.

ab + cd → ac + bd
(15 g) (10 g)

the total mass of the products is 50g. which best completes the other two amounts?

a: the amount of cd is 40 g, and the amount of ac is 35 g.
b: the amount of cd is 35 g, and the amount of ac is 40 g.
c: the amount of cd and ac would be the same.
d: the amount of cd and ac is undetermined.

Organelles are 1. responsible for producing power for the cell 2. tiny structures in the cell that carry out the cell's activities 3. responsible for digestion in the cell 4. found outside of the membrane

Some material consisting of a collection of microscopic objects is kept at a high temperature. a photon detector capable of detecting photon energies from infrared through ultraviolet observes photons emitted with energies of 0.3 ev, 0.5 ev, 0.8 ev, 2.0ev, 2.5ev, and 2.8ev. these are the only photon energies observed. (a) draw and label a possible energy-level diagram for one of the microscopic objects, which has four bound states. on the diagram, indicate the transitions corresponding to the emitted photons. explain briefly. (b) would a spring–mass model be a good model for these microscopic objects? why or why not? (c) the material is now cooled down to a very low temperature, and the photon detector stops detecting photon emissions. next, a beam of light with a continuous range of energies from infrared through ultraviolet shines on the material, and the photon detector observes the beam of light after it passes through the material. what photon energies in this beam of light are observed to be significantly reduced in intensity (“dark absorption lines”)? explain briefly.

To a of 4 x hz is 1. 0. mm nm nm