How many carbon and hydrogen atoms are there in the unit cell of polyethylene shown in Figure 2.21c, assuming that the density of crystalline polyethylene is 0.996 g/cm3 ?
What will be an ideal response?
However in this case there are two atom types: carbon and hydrogen. There are always 2 hydrogen atoms for each carbon. Thus if x is the number of carbon atoms then 2x is the number of hydrogen. The above equation can then be written as for molecules as:
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Answer the following statement true (T) or false (F)
Ice tends to form first at the
A) surface of bodies of water. B) bottom of bodies of water. C) either depending on water depth.
Latent Heats: The figure shows a graph of the temperature of a pure substance as a function of time as heat is added to it at a constant rate in a closed container. If LF is the latent heat of fusion of this substance and LV is its latent heat of vaporization, what is the value of the ratio LV/LF?
A. 5.0 B. 4.5 C. 7.2 D. 3.5 E. 1.5
A 20.0 cm long organ pipe is filled with air and is open at one end and closed at the other. The velocity of sound in air at 0
is 331 m/s. What is the frequency of the third mode?
A. 2,070 Hz B. 2,190 Hz C. 2,320 Hz D. 2,450 Hz E. 2,680 Hz