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4 years ago

Which statement best explains why the sun and the moon appear to be about the same size in the sky?

Chemistry

2 answers:

Dahasolnce [82]4 years ago

7 0

I think the answer is C... not one 100%

hodyreva [135]4 years ago

3 0

The answer is B, as the moon is about 400 times smaller than the sun, but is also about 400 times closer to earth. So, it has a smaller diameter and is closer to earth than the sun.

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Alice and Bob are experimenting with two moles of neon, a monatomic gas, that starts out at conditions of standard temperature a

Archy [21]

Answer:

29273.178 joules have been added to the gas for the entire process.

Explanation:

The specific heats of monoatomic gases, measured in joules per mol-Kelvin, are represented by the following expressions:

Isochoric (Constant volume)

$c_{v} = \frac{3}{2}\cdot R_{u}$ (1)

Isobaric (Constant pressure)

$c_{p} = \frac{5}{2}\cdot R_{u}$ (2)

Where $R_{u}$ is the ideal gas constant, measured in pascal-cubic meters per mol-Kelvin.

Under the assumption of ideal gas, we notice the following relationships:

1) Temperature is directly proportional to pressure.

2) Temperature is directly proportional to volume.

Now we proceed to find all required temperatures below:

(i) <em>Alice heats the gas at constant volume until its pressure is doubled</em>:

$\frac{T_{2}}{T_{1}} = \frac{P_{2}}{P_{1}}$ (3)

( $\frac{P_{2}}{P_{1}} = 2$ , $T_{1} = 273.15\,K$ )

$T_{2} = \frac{P_{2}}{P_{1}} \times T_{1}$

$T_{2} = 2\times 273.15\,K$

$T_{2} = 546.3\,K$

(ii) <em>Bob further heats the gas at constant pressure until its volume is doubled</em>:

$\frac{T_{3}}{T_{2}} =\frac{V_{3}}{V_{2}}$ (4)

( $\frac{V_{3}}{V_{2}} = 2$ , $T_{2} = 546.3\,K$ )

$T_{3} = \frac{V_{3}}{V_{2}}\times T_{2}$

$T_{3} = 2\times 546.3\,K$

$T_{3} = 1092.6\,K$

Finally, the heat added to the gas ( $Q$ ), measured in joules, for the entire process is:

$Q = n\cdot [c_{v}\cdot (T_{2}-T_{1})+c_{p}\cdot (T_{3}-T_{2})]$ (5)

If we know that $R_{u} = 8.314\,\frac{Pa\cdot m^{3}}{mol\cdot K}$ , $n = 2\,mol$ , $T_{1} = 273.15\,K$ , $T_{2} = 546.3\,K$ and $T_{3} = 1092.6\,K$ , the heat added to the gas for the entire process is:

$c_{v} = \frac{3}{2}\cdot \left(8.314\,\frac{Pa\cdot m^{3}}{mol\cdot K} \right)$

$c_{v} = 12.471\,\frac{J}{mol\cdot K}$

$c_{p} = \frac{5}{2}\cdot \left(8.314\,\frac{Pa\cdot m^{3}}{mol\cdot K} \right)$

$c_{p} = 20.785\,\frac{J}{mol\cdot K}$

$Q = (2\,mol)\cdot \left[\left(12.471\,\frac{J}{mol\cdot K} \right)\cdot (536.3\,K-273.15\,K)+\left(20.785\,\frac{J}{mol\cdot K} \right)\cdot (1092.6\,K-546.3\,K )\right]$

$Q = 29273.178\,J$

29273.178 joules have been added to the gas for the entire process.

6 0

3 years ago

Who wants to talk till 1am? hmu:)

Ulleksa [173]

Answer:

Explanation:

lol hi

3 0

3 years ago

In what way do the oceans and the forests perform a similar function in the carbon cycle, under normal conditions?.

ikadub [295]

Both take carbon dioxide out of the atmosphere.

The ocean absorbs much of the carbon dioxide released when fossil fuels are burned. This extra carbon dioxide lowers the ocean's pH through a process called ocean acidification. Both are important elements for all life on earth. Relationship between the water cycle and the carbon cycle. The sun's energy drives both the carbon cycle and the water cycle.

Recall that sunlight water and carbon dioxide combine in green plants via photosynthesis to produce carbohydrates. The ocean also regulates the Earth's climate. They determine the weather by telling temperatures and determining rainfall, droughts, and floods. It is also the world's largest carbon sink, with an estimated 83% of the global carbon cycle circulating in seawater.

Learn more about The carbon cycle here:-brainly.com/question/1194643

#SPJ4

8 0

2 years ago

Plz help with chemistry quiz I’ll mark brainliest

nataly862011 [7]

Answer:

Among the given options which one best suits the definition of an element?

Explanation:

Element:

Element is the pure form of matter which cannot be broken down into new simpler substances either by physical or chemical means.

It is made up of the same type of atoms.

For example:

Copper, silver, gold, oxygen, etc.

Among the given options:

the third option that is elements are made of atoms is the correct option.

Remaining statements:

Elements are made up of complex chains of carbon and oxygen is wrong,

Elements can be broken down into other simpler substances is wrong.

Because we don't get any simpler substances from elements.

For example, if we break a gold rod many times also only its size varies and no new substance is obtained from it.

All elements have the same chemical properties is a wrong statement.

Because each element is unique and it has its own properties.

7 0

3 years ago

Which type of weathering is caused by plants?

alexdok [17]

Answer:

Explanation:

7 0

3 years ago

Read 2 more answers