13. Propane's melting point is -188 °C. It's boiling point is -42 °C. A 200 g sample of propane at -80 °C is warmed to 0 °C. The specific heat of propane gas is 1.68 J/gC. The
specific heat of liquid propane is 2.11 J/gC.
a. Draw a full heating/cooling curve and clearly darken the region this represents.
Label the key temperatures, the states of matter, the types of energy in each
region.
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b. Draw an energy bar diagram for this situation. (2 points) -
Calculate the total energy for the process. (5 points) -3
2.1/d. Is the process endothermic or exothermic? Explain why. (2 points)Vaz
C.

under a microscope, cancer cells may look very different from normal cells. they often have different sizes and some may be larger than normal while others are smaller. cancer cells are often abnormally shaped and the control centre of the cell (the nucleus) may have an abnormal appearance.

i think? ?

answer:

the answer is 6 valence electrons.

explanation:

valence is the # of electrons on the outer most shell of an atom.

oxygen has 6.

although, the valency of oxygen is 2, because it only needs to make 2 covalent bonds, or gain 2 electrons, to achieve the stable octet configuration of a noble gas.

that's it!

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~ trueboss72