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solniwko [45]
2 years ago
14

Arrange the events In the Ilfe of a star In the correct order.

Chemistry
1 answer:
Ksju [112]2 years ago
8 0

The events in the life of a star in the correct order is as follows: F, B, C, D, E and A.

<h3>What is the life of a star?</h3>

The life of a star refers to the the events that occur in a star from when it formed newly until when it finally dies off.

When stars are newly formed, they are formed from star dust, and when just before they die, the form supernovas.

The several events in the life of a star can be arranged thus:

  • The temperature increases in the center of a nebula, and nuclei begin to fuse.
  • As the nuclear fusion sets off a chain reaction, the nebula gets hotter and brighter and turns into a star.
  • The star stays in the main sequence stage for a long time.
  • The star runs out of hydrogen and turns into a planetary nebula or a supernova, depending on its mass.
  • Heavy elements are created when the supernova explodes.
  • All that remains of the star now is the core. In some cases, the star turns into a black hole

In conclusion, the life of a star is the period of its formation to its burning out or death.

Learn more about life of a star at: brainly.com/question/988039

#SPJ1

Note that the complete question is given below:

Arrange the events in the life of a star in the correct order.

A. All that remains of the star now is the core. In some cases, the star turns into a black hole

B. As the nuclear fusion sets off a chain reaction, the nebula gets hotter and brighter and turns into a star.

C. The star stays in the main sequence stage for a long time.

D. The star runs out of hydrogen and turns into a planetary nebula or a supernova, depending on its mass.

E. Heavy elements are created when the supernova explodes.

F. The temperature increases in the center of a nebula, and nuclei begin to fuse.

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A gas has an empirical formula CH4. 0.16g of the gas occupies a volume of 240cm^3 What is the molecular formula of the gas???.
yulyashka [42]

Explanation and answer:

The molar volume of a gas is 22.4 L at 0 deg. C.

So the molar mass of the gas is, by proportion,

0.16 g * (22400 mL)/(240 mL) = 14.93 g

The molar mass of (CH4)n = 12+4(1) = 16.

So n = 15.93/16 = 1, or the molecular formula is CH4.

Note: The temperature at which the volume was observed was not given.  If 240 cm^3 was observed at 20 deg.C, then the volume at 0 deg.C would be

V=240*(273+0)/(273+20) = 223.6

The molar mass = 0.16*22400/(223.6) = 16.03

which gives n = 16/16.03 = 1 again, but more accurately.

8 0
3 years ago
Which would have a higher pH, a 0.1 M solution of a strong acid, or a weak acid? Why?
DerKrebs [107]

Answer:

0.1 M weak acid

Explanation:

The term pH simply means power of hydrogen which is basically a log (the exponent to base 10 of the concentration) of the concentration of the hydrogen ions.

Weak acids have a higher pH since their hydrogen concentration is lower than that of strong acids.

6 0
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A scientist is examining a simple multicellular organism with a nucleus and specialized organelles that was found in a moist env
Elza [17]

Answer:Answer: (B) Archaebacteria

Explanation:

Explanation: Archaebacteria, like all prokaryotes, have no membrane bound organelles. This means that the archaebacteria are without nuclei, mitochondria, endoplasmic reticula, lysosomes, Golgi complexes, or chloroplasts. Because these organisms have no nucleus, the genetic material floats freely in the cytoplasm

4 0
4 years ago
A mixture of h2 and n2 has a density of 0.216 at 300k and 500 torr. what is the mole fraction composition of the mixture
natta225 [31]
We know that:
number of moles (n) = mass / molar mass

Now, from the general law of gases:
PV = nRT
where:
P is the pressure = 500 torr = 0.65 atm
V is the volume
n is the number of moles
R is the gas constant = 0.082
T is the temperature = 300 k
We will just rearrange this equation as follows:
P = nRT / V
Then we will substitute n with its equivalent equation mentioned at the beginning:
P = (mass x R x T) / (volume x molar mass) ......> equation I
Now, we know that:
density = mass / volume
We will substitute (mass/volume) in equation I with density as follows:
P = (density x R x T) / molar mass 
Rearrange this equation to get the mass as follows:
molar mass = <span>dRT/P = (0.216 x 0.082 x 300) / 0.65 = 8.4738 grams
</span>
From the periodic table:
molecular mass of hydrogen = 1 grams
molecular mass of nitrogen = 14 grams
Therefore:
molar mass of hydrogen = 2 x 1 = 2 grams
molar mass of nitrogen = 2 x 14 = 28 grams

We can assume that the number of moles of of each element is y.
We can thus build up the following equation:
2y + 28y = 8.4738
30y = 8.4738
y = 0.28246

Therefore:
mole fraction of hydrogen = 2 x 0.28246 = 0.56492
mole fraction of nitrogen = 28 x 0.28246 = 7.90888


4 0
4 years ago
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