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s344n2d4d5 [400]
3 years ago
12

Which two properties define the critical point of matter in a phase diagram?

Chemistry
1 answer:
valkas [14]3 years ago
4 0

Answer:

C: pressure and temp

Explanation:

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Capillary action is defined as the ability of a liquid to go up a narrow space without the help or opposition of external forces. One of the most important factors affecting capillary action is the intermolecular forces within a substance. The higher the IMF, the greater the capillary action. The H-bonding in water gives it greater IMF than acetone, so water has greater capillary action.
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I just need the right answer plz
astraxan [27]

Answer:

-0.5

Explanation:

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Consider this reaction:
storchak [24]
I say the Correct answer is
 
B)  There will be a shift toward the products.
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2 years ago
Which theory was contradicted by experiments with the photoelectric effect?
scZoUnD [109]

Answer:

Wave theory of light that states that visible light irrespective of its color, can cause the ejection of electrons when it strikes a metal.

Explanation:

Wave theory of light:

  1. If we go through wave theory of light, it clearly focuses that light is of actually wave nature not particle nature.
  2. The wave theory was based on the ideas of Hertz who discovered in 1887 that metallic surface can emit heat energy (electrons) when light hits the metal.  If we increase the intensity of light, it will also increase the incident energy and ultimately increase the kinetic energy of electrons.  
  3. Moreover, the frequency of light do not matters much, just a beam of light can eject the electrons from the metal.

Photoelectric effect:

On the other hand, Photoelectric effect can be considered only if we assume that light has particle like nature and not wave like nature.  

  1. It also says that frequency of light matters alot in ejecting the electrons from the metals. If the frequency of light is less, it will not eject electrons from the metal surface even if it falls on metal for a very long time.
  2. It also says that  maximum kinetic energy of the electrons (that are emitted) corresponds with the light frequency that caused the emission of electrons.
  3. The current of emitted electrons is directly proportional to the intensity of light that caused the electron emission.

We can see that the postulates of wave theory (like no.3) are just opposite to the postulates of photoelectric effect. The photoelectric effect also explained the relationship between emitted electrons and light in a better way that was not described by wave theory. We can say that it is as advanced explanation of facts based on the classical theory of wave like nature of visible light.



8 0
3 years ago
The value of ΔH for the reaction below is -72 kJ. __________ kJ of heat are released when 1.0 mol of HBr is formed in this react
eimsori [14]

Answer:

36 KJ of heat are released when 1.0 mole of HBr is formed.

Explanation:

<em>By Hess law,</em>

<em>The heat of any reaction  ΔH  for a specific reaction is equal to the sum of the heats of reaction for any set of reactions which in sum are equivalent to the overall reaction:</em>

H 2 (g) + Br 2 (g) → 2HBr (g)         ΔH = -72 KJ

This is the energy released when 2 moles of HBr is formed from one mole each of H2 and Br2.

Therefore, Heat released for the formation of 1 mol HBr would be half of this.

Hence,

ΔHreq = -36 kJ

36 KJ of heat are released when 1.0 mole of HBr is formed.

4 0
3 years ago
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