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Vedmedyk [2.9K]
3 years ago
6

10 points !! Which can happen during a physical change?

Chemistry
1 answer:
Sveta_85 [38]3 years ago
5 0
I think that the answer is A because if you think about water for an example. When water turns into ice, it's still technically water, just the molecules are frozen. The water is physically changed. It could also see why you think it is B but I don't think so completely. It doesn't really make sense to me. So I'd choose A. It's definitely not C or D.
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What is commonly used to run a central heating system?
Troyanec [42]
Answer :- Electrical energy

Explanation :-
Geothermal energy is too large scale
solar energy is inefficient
Nuclear does more harm
7 0
2 years ago
Rank the following compounds in order of decreasing boiling point: potassium fluoride (KF), acetylene (C2H2), and formaldehyde (
otez555 [7]

Answer: KF > CH_2O > C_2H_2

Explanation:

The order of boiling point depends upon the type of interactions present between the molecules.

Potassium fluoride (KF) is an ionic compound and the opposite ions are held together by strong electrostatic forces.

C_2H_2 is a covalent compound and the molecules are held together by weak van der Waals' forces.

Formaldehyde is a polar compound due to presence of polar carbonyl group. Hence dipole-dipole force is present between formaldehyde molecules.

Thus the decreasing order of boiling point is:

KF > CH_2O > C_2H_2

8 0
2 years ago
Please help. I'll give brainliest :)
Goryan [66]

Answer:

b

Explanation:

3 0
2 years ago
Consider this chemical reaction, where moving from left to right represents moving forward in time. A five panel comic strip. In
yulyashka [42]

Answer:

The reaction reaches equilibrium at the fourth panel.

Explanation:

Chemical Equilibrium is achieved when the overall properties the system seem to be constant, that is, stop changing.

Although, for chemical equilibrium, the right term for this equilibrium is dynamic equilibrium; the rate of forward reaction balances the rate of backward reaction, but concentrations can keep changing.

The point where equilibrium is achieved is when exactly when we reach the panel where the spheres that make up this panel is the same as the next panel and the next, that is, the specific colour and number of spheres start to become unchanged.

And from the description given in the question,

- In the first panel, there are ten large red spheres.

- In the second panel, there are 8 large red spheres and two small blue spheres.

- In the third panel, there are six large red spheres and four small blue spheres.

- In the fourth panel, there are four large red spheres and six small blue spheres.

- In the fifth panel, there are four large red spheres and six small blue spheres.

It is evident that the make-up of the spheres have become the same as at the fourth and fifth panel. This means that the first point where this final configuration of spheres first appeared is the fourth panel.

Hence, equilibrium is first reached at the fourth panel.

Hope this Helps!!!

6 0
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
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