15. the ratio pv to nrt is plotted against pressure for ch4 at 0°c and 200°c. why does the curve for 0°c drop below the horizontal line for an ideal gas whereas the curve for 200°c does not?
a) at 200°c, the molecules can overcome intermolecular attractions.
b) at 200°c, the volume of individual molecules becomes negligible.
c) at 200°c, the forces between molecules become repulsive.

A) At 200 °C, the molecules can overcome intermolecular attractions.

Explanation:

At 200 °C, the molecules can overcome intermolecular attractions, so the exerted pressure by the movement of the molecules  increases and the positive deviation from ideal gas behavior occurs.

why is cellular respiration important for homeostasis?

it changes food into energy that the organism can use.

which of the following is most likely to happen if a cell is not able to divide?

the cell will not be replaced when it is damaged.

explanation:

c. because step up transformer steps up the input voltage i.e increases the input voltage  

the number of turns are greater on the secondary side of step up transformer  

transformer does not handle dc current