Which of the following statements is true of the critical temperature of a pure substance?A. The critical temperature is the temperature above which the liquid phase of a pure substance can exist.
B. The critical temperature is the temperature above which the liquid phase of a pure substance cannot exist.
C. The critical temperature is the temperature below which the liquid phase of a pure substance cannot exist.
D. The critical temperature is the temperature at which all three phases can coexist.
E. The critical temperature is the temperature at which the pure substance reaches, but cannot go beyond, the critical pressure.
Can someone explain this one?

Answers

Answer 1

Answer: B
After temperature reaches certain treshold the difference between density of liquid and gas state disappears, and it is impossible to liquify the substance.

Answer 2

Answer:

Answer:what do u mean tho

Explanation:

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A gas absorbs 3.4 kJ of heat and does 1.9 kJ of work. Calculate ΔE
Please help me with this question! :-)
The standard on which the atomic mass unit is based is the mass of a (1 point)proton. neutron. chlorine-35 atom. carbon-12 atom.

How many different sets of equivalent protons are there for para-xylene (1,4-dimethylbenzene)? only 1 two three four?

Answers

Answer:

Two

Step-by-step explanation:

There are two ways to determine the number sets of equivalent protons in a compound.

(a) By substitution

Replace each H with a different group and see if you get a different compound

For example, the six CH₃ H atoms are an equivalent set, because, if I replace any one of them, I will always get the same compound: 1-chloromethyl-4-methylbenzene (Fig. 1).

Similarly, the four aromatic H atoms are an equivalent set. If I replace any one of them, I will always get the same compound: 2-chloro-1,4-dimethylbenzene (Fig. 2).

Thus, there are two sets of equivalent protons in p-xylene.

(b) By symmetry

Two atoms are equivalent if one can be converted into the other by a symmetry operation on the molecule.

The methyl hydrogens can be interconverted by a combination of reflections about the AB and CD mirror planes and byrotations about the C-C bonds to the ring (Fig. 3).

Similarly, the four aromatic H atoms can be interconverted by a combination of reflections about the AB and CD mirror planes.

Again, we find two sets of equivalent protons.

The mass of 69Ga is 68.7200 amu . The mass of 71Ga is 70.9200 amu .

Answers

I'm not sure if what this question is asking but ill be assuming that the average molecular mass is required. An assuming that the abundance of each isotope is 50% the average molecular mass is 69.82 amu.

The measure of distance from one point to another is?

Answers

The distance from one point to another is the distance traveled by a light beam between them.

If you have the coordinates of the 2 points, then the distance between them is

√ of [ (the difference in their x-values)² + (the difference in their y-values)² ]

In an aqueous solution, a chloride ion is attracted to which end of the water molecule?

Answers

Answer : In an aqueous solution, a chloride ion is attracted to the hydrogen end of the water molecule.

Explanation :

The meaning of aqueous solution is the solution in which the solvent is water. In water molecule $H_2O$ , oxygen atom is more electronegative than the hydrogen atom. That means, the hydrogen in the water molecule has partial positive charge and oxygen has partial negative charge.

As the chloride ion have the (-1) negative charge. So, it will be attracted towards the positive charge that is hydrogen end of the water molecule because opposite charges attract to each other.

Hence, in an aqueous solution, a chloride ion is attracted to the hydrogen end of the water molecule.

The end with the hydrogen atoms because the chloride ion is negatively charged while the hydrogen is positive. Hope this helps

Democritus was a Greek philosopher living from c. 460 B.C. to c. 370 B.C. He wrote several suppositions on the properties of matter.Which of the following statements most closely describes Democritus's ideas about matter?

A. All matter is composed of tiny particles that can vary in shape, size, and weight.

B. Solid matter is composed of square-shaped particles and liquid matter is composed of flat particles.

C. Solid matter is composed of atoms and liquid matter is composed of elements.

Answers

The correct answer is answer choice A, all matter is composed of tiny particles that can vary in shape, size, and weight. Democritus believed that the universe is made up of empty space and tiny particles; these particles were atoms.

Hope this helps!

What is the molarity (M) of a solution that contains .25 moles of a compound in 1.8 L of solution?