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Minchanka [31]
2 years ago
9

Why does the Sun appear larger and brighter as seen from Earth than the other stars in the chart? Use the table to help you answ

er the question
A) It is hotter.
B) It is larger.
C) It is closer.
D) It is yellow.

Name of Star Distance from Earth Color Size Temperature
The Sun 93 million miles yellow medium dwarf 27,000,000 °F
Proxima Centauri 25,200 million miles red small dwarf 48,000,000 °F
Barnard's Star 36,000 million miles red small dwarf 5,000 °F
Chemistry
2 answers:
FinnZ [79.3K]2 years ago
8 0
Its C. for the first thing

nata0808 [166]2 years ago
4 0
C it is closer because it is true
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a) (1 point) Build anthracene, optimize its geometry and examine its structure. Describe its shape. b) (1 point) Measure the C-C
oksano4ka [1.4K]

Answer:

a) The structure of anthracene is planar with all the pi electrons delocalized in the structure to maintain aromaticity.

b) The C-C bond length in anthracene is about 140 pm with all the bond lengths being similar to each other.

The standard C-C bond length is 154 pm while standard C=C bond is about 134 pm. Therefore the bond length in anthracene is smaller than standard C-C bond length and longer than standard C=C bond length. This can be explained from the fact that the C-C bonds in anthracene has be mixed characteristics of single and double bond because of the delocalization of pi electrons over the whole structure. As a result, they are neither fully single nor fully double bond in nature. Hence the observed bond lengths.

c) This molecule is not flat. The N-atom is sp3 hybridized here and the H-atom attached to N will remain out of plane.

Explanation:

8 0
2 years ago
A teacher cut an apple into three wedges of the same size. She dipped one wedge in lemon juice, dipped another in water, and lef
aleksandrvk [35]

Answer:

The responding variable of this experement is the outcome and that would be  that the one in lemon juice responded and the one  in water didn't (the other one is the control). Thus the responding varible is the one in lemon juice.

Explanation:

4 0
2 years ago
Read 2 more answers
A well-insulated, closed device claims to be able to compress 100 mol of propylene, acting as a SoaveRedlich-Kwong gas and with
Setler79 [48]

Explanation:

The given data is as follows.

    Moles of propylene = 100 moles,    T_{i} = 300 K

    T_{f} = 800 K,    V_{i} = 2 m^{3}

    V_{f} = 0.02 m^{3},   C_{p} of propylene = 100 J/mol

Now, we assume the following assumptions:

Since, it is a compression process therefore, work will be done on the system. And, work done will be equal to the heat energy liberating without any friction.

            W = mC_{p} \Delta T

     100 moles \times 100 J/mol K (800 - 300) K

                 = 5 \times 10^{6} J

                 = 5 MJ

Thus, we can conclude that a minimum of 5 MJ work is required without any friction.

3 0
2 years ago
Calculate the internal energy of 2 moles of argon gas (assuming ideal behavior) at 298 K. Suggest two ways to increase its inter
Dominik [7]
I hope this helps you.

5 0
2 years ago
A mixture of three gases has a total pressure at 298 K of 1560 mm Hg. the mixture is analyzed and is found to contain 1.50 mol N
Agata [3.3K]

Answer:

the partial pressure of Xe is 452.4 mmHg

Explanation:

Dalton's law of partial pressures says that in a mixture of non-reacting gases, the total pressure exerted is equal to the sum of the partial pressures of the individual gases.

The partial pressures can be calculated with the molar fraction of the gas, in this case, Xe.

Molar fraction of Xe is calculated as follows:

x_{Xe}=\frac{n_{Xe} }{n_{t} }

x_{Xe}=1.75/5.9\\x_{Xe}=0.29

Then, 0.29 is the molar fraction of Xe in the mixture of gases given.

To know the parcial pressure of Xe, we have to multiply the molar fraction by the total pressure:

Partial Pressure of Xe=1560mmHg*0.29

Partial Pressure of Xe=452.4mmHg

7 0
1 year ago
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