Define critical point.
Group of answer choices:
A. The temperature and pressure above which a supercritical fluid exists.
B. The temperature and pressure are equal.
C. The temperature and pressure below which a supercritical fluid exists.
D. The temperature and pressure are not equal.
E. The temperature and pressure where liquid, solid, and gas are equally stable and are in equilibrium.

A. The temperature and pressure above which a supercritical fluid exist.

Explanation:

The physical states of a substance under different temperature and pressure conditions is represented by a phase diagram. In this diagram, normally the pressure is represented on the y-axis while the temperature is present on the x-axis. There is a point on this diagram called the critical point, beyond this point the liquid and the gaseous phase become indistinguishable. When the substance surpasses the critical point, it is referred as a supercritical fluid.

From the above description, all the options other than A is false.

2fe + 3h2so4 -> fe2(so4)3 + 3h2

it is necessary to balance equations in order to get the proper amount of reactants as well as products in order not to make a miscalculation.

you cannot change the subscripts as that would change the substance itself. for instance, diatomic elements such as h2 only have the subscript two when a gas. another example would be so4, if you were to change the subscript, the element would no longer be sulfate.

we change the coefficients instead as that only changes the number of molecules rather than the substance itself.

hope this !

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