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Pachacha [2.7K]
4 years ago
15

Which statements describe properties of stars? Check all that apply

Chemistry
2 answers:
blondinia [14]4 years ago
6 0

The following statements describes properties of stars;

  • Stars produce energy through nuclear fusion.
  • Stars are massive objects composed of gas.
  • Stars are composed primarily of hydrogen and helium

Explanation:

Stars mainly burn hydrogen gas in their core by fusion to produce the enormous energy they produce. Due to the immense gravity form their mass, stars are able to compress hydrogen gas in their core such that the atoms of the gas fuse to form heavier elements like helium. In the process, high energy is released such as in the form of electromagnetic radiation and neutrons. If the star is even bigger (supermassive stars), they are able to fuse helium into carbon dioxide producing even more fusion energy. Therefore, starts are mainly enormous blobs of burning gases.

Learn More:

For more on fusion in stars check out;

brainly.com/question/10811772

brainly.com/question/3035475

#LearnWithBrainly

7nadin3 [17]4 years ago
5 0

Answer:

A C and E

Explanation:

I took the test

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The voltage generated by the zinc concentration cell described by the line notation Zn ( s ) ∣ ∣ Zn 2 + ( aq , 0.100 M ) ∥ ∥ Zn
Oxana [17]

Answer:

0.193 M

Explanation:

We need to calculate the Zn²⁺ concentration at the cathode where reduction occurs which is the right side in the expression:

Zn2+(aq,0.100 M) ‖ Zn2+(aq,? M) | Zn(s)

Zn²⁺ (aq,?) + 2 e⁻   ⇒ Zn (s)

and oxidation will occur in the anode

Zn (s) ⇒ Zn²⁺ (aq, 0.100 M ) + 2 e⁻

and the overall reaction is

Zn²⁺ (aq,?) ⇒ Zn²⁺ (0.100 M )

The driving force is the difference in concentration and E the electromotive force will be given by

E = Eº - 0.0592/2 log [Zn²⁺ (0.100 M) / Zn²⁺ (M) ]

Plugging the value for E and knowing Eº is cero because we have the same electrodes, we have

17.0 x 10⁻³ = 0 - 0.0592 log 0.100/ X =

- 17.0 x 10⁻³ / 0.0592 = log 0.100 / X

- 0.287 = log (0.100 / X)

Taking inverse log to both sides of the equation

0.516 = 0.100 / X   ⇒ X = 0.100 / 0.516 = 0.193 M

4 0
3 years ago
Which of the following is the main function of the Circulatory System?
kolbaska11 [484]

Answer:

B: The transport oxygen and nutrients around your body and help to get rid of wastes

Explanation:

The circulatory system carries oxygen and nutrients to the body, but it can also help get rid of waste (though that isn't a huge function of it).

8 0
3 years ago
The production of iron and carbon dioxide from iron(iii) oxide and carbon monoxide is an exothermic reaction. which expression c
NARA [144]
Missing question:
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When one mole of iron(III) oxide reacts 26,3 kJ of energy is required and for 3,2 moles of iron(III) oxide 3,2 times more energy is required.</span>
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3 years ago
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7 0
3 years ago
Who was the first to propose the idea of atoms?
VMariaS [17]

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Explanation

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3 years ago
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