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Pachacha [2.7K]
4 years ago
7

Which of the following can best be described as an element or compound

Physics
2 answers:
aliina [53]4 years ago
8 0

Answer:

C

Explanation:

Technically, you must chemically separate most mixtures. For example, if I were to mix some Nesquick with some milk, it would have to be evaporated by heat to separate the two (and even then, there would not be pretty much any of the nesquick afterwards).

Hope this kinda helps. Not an expert, but....yeah

Lynna [10]4 years ago
7 0

Answer:

A

Explanation:

because you cannot seperate the matter duhhh hahha

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Suppose that we use a heater to boil liquid nitrogen (N2 molecules). 4480 J of heat turns 20 g of liquid nitrogen into gas. Note
love history [14]

Answer:

The energy is 9.4\times10^{-21}\ J

(a) is correct option

Explanation:

Given that,

Energy = 4480 j

Weight of nitrogen = 20 g

Boil temperature = 77 K

Pressure = 1 atm

We need to calculate the internal energy

Using first law of thermodynamics

Q=\Delta U+W

Q=\Delta U+nRT

Put the value into the formula

4480=\Delta U+\dfrac{20}{28}\times8.314\times77

\Delta U=4480-\dfrac{20}{28}\times8.314\times77

\Delta U=4022.73\ J

We need to calculate the number of molecules in 20 g N₂

Using formula of number of molecules

N=n\times \text{Avogadro number}

Put the value into the formula

N=\dfrac{20}{28}\times6.02\times10^{23}

N=4.3\times10^{23}

We need to calculate the energy

Using formula of energy

E=\dfrac{\Delta U}{N}

Put the value into the formula

E=\dfrac{4022.73}{4.3\times10^{23}}

E=9.4\times10^{-21}\ J

Hence, The energy is 9.4\times10^{-21}\ J

4 0
3 years ago
Which list places the layers of the sun in the correct order from innermost to outermost?
LiRa [457]

Answer:

Convective zone, chromosphere, corona

Explanation:

A star like the Sun is divided into different layers according to pressure, density, temperature, and the mechanics of energy transport (in the case of the convective zone and radiative zone) for each of those layers.

In stars, there is an equilibrium between two forces, the force of gravity in the inward direction due to their own mass and the radiation pressure in the upward direction as a consequence of the nuclear reaction in their core, that is known as hydrostatic equilibrium.

That leads to different layers according with the properties described above.    

       

Near the core, in the Sun, there is a radiative zone since radiation is the best mechanism of energy transport in this area. Then, in the next layer, it can be found that convection becomes a more efficient way of energy transport that radiation due to the fact that the inner part of the convection zone is at a greater temperature than the outer one.    

Finally, there is the atmosphere of the Sun (chromosphere, photosphere, and corona).

                                       

Key terms:        

Convection: Transport of energy due to different in density and temperature of a material (liquid, gas).    

     

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1. One
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