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3 years ago

List evidence that supports the Big Bang Theory.

Chemistry

2 answers:

Novay_Z [31]3 years ago

7 0

Answer:

Explanation:

There are three great evidences that support the Big Bang theory:

The universe expands: Edwin Hubble observed that galaxies move away from each other at speeds proportional to the distance between them. This means that the universe is expanding. Then it is possible to think that, at some point in time, he was concentrating on one point. At that point the temperature and density would be extremely high, which is what we call ‘Big Bang’ or ‘Big Bang’.

The composition of the universe is three quarters of hydrogen and one quarter of helium, the two lightest elements: Both constitute 98% of the total mass of the universe. The rest of the periodic table represents approximately 2% of the total mass. All those ‘heavy’ atoms were born in the stellar nuclei. The quantities observed in the universe coincide with those that would be expected if the universe had cooled sufficiently in the three minutes following the Big Bang. That is, approximately three minutes after the initial moment, the temperature would have dropped enough to stop any nuclear reaction, leaving a universe with the observed amounts of hydrogen and helium.

Temperature and background radiation: The universe was born in an indescribably hot state and has been cooling. It was possible to measure an estimated current temperature of 2.8 Kelvin, very close to absolute zero. It was also possible to measure the emission of the Milky Way, detecting a signal, which could not be eliminated. This noise or persistent signal throughout the universe is the "echo" of the beginning of time.

These are the three main evidences that support the Big Bang Theory.

Sphinxa [80]3 years ago

5 0

The redshift<span> of distant </span>galaxies<span> means that the Universe is probably </span>expanding. If we then go back far enough in time, everything must have been squashed together into a tiny dot and the rapid eruption from this tiny dot was the Big Bang. Another piece of evidence could be that because light takes a long time to travel across the Universe, when we look at very distant galaxies or stars we are also looking back in time. This shows us that galaxies a long time ago were quite different from those today, showing that the Universe has changed. This fits better with the Big Bang theory than the Steady State theory

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g Calculate the time (in min.) required to collect 0.0760 L of oxygen gas at 298 K and 1.00 atm if 2.60 A of current flows throu

lozanna [386]

Answer:

7.67 mins.

Explanation:

Data obtained from the question include the following:

Volume (V) = 0.0760 L

Temperature (T) = 298 K

Pressure (P) = 1 atm

Current (I) = 2.60 A

Time (t) =?

Next, we shall determine the number of mole (n) of O2 contained in 0.0760 L.

This can be obtained by using the ideal gas equation as follow:

Note:

Gas constant (R) = 0.0821 atm.L/Kmol

PV = nRT

1 x 0.0760 = n x 0.0821 x 298

Divide both side by 0.0821 x 298

n = 0.0760 / (0.0821 x 298)

n = 0.0031 mole

Next, we shall determine the quantity of electricity needed to liberate 0.0031 mole of O2.

This is illustrated below:

2O²¯ + 4e —> O2

Recall:

1 faraday = 1e = 96500 C

4e = 4 x 96500 C

4e = 386000 C

From the balanced equation above,

386000 C of electricity liberated 1 mole of O2.

Therefore, X C of electricity will liberate 0.0031 mole of O2 i.e

X C = 386000 X 0.0031

X C = 1196.6 C

Therefore, 1196.6 C of electricity is needed to liberate 0.0031 mole of O2

Next, we shall determine the time taken for the process. This can be obtained as follow:

Current (I) = 2.60 A

Quantity of electricity (Q) = 1196.6 C

Time (t) =?

Q = It

1196.6 = 2.6 x t

Divide both side by 2.6

t = 1196.6/2.6

t = 460.23 secs.

Finally, we shall convert 460.23 secs to minute. This can be achieved by doing the following:

60 secs = 1 min

Therefore,

460.23 secs = 460.23/60 = 7.67 mins

Therefore, the process took 7.67 mins.

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Pak Dollah who is long-sighted forgot to bring his glasses during breakfast in a restaurant. You are required to invent a lens t

Andre45 [30]

A converging lens made from a transparent plastic bottle filled with water is used to enable Pak Dollah read the newspaper.

<h3>What is long-sightedness?</h3>

Long-sightedness is an eye effect in which objects are not able to focus on the retina but behind the retina, therefore, near objects are not clearly seen except they are placed far away.

To correct long-sightedness, a suitable converging lens is used to bring the image to focus on the retina.

To construct a converging lens for Pak Dollah, the transparent plastic bottle is filled with water to serve as a converging lens and Pal Dollah will read through it.

Therefore, a converging lens made from a transparent plastic bottle filled with water is used to enable Pak Dollah read the newspaper.

Learn more about long-sightedness at:brainly.com/question/4419161

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2 years ago

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Rudik [331]

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</span><span>
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3 years ago

Which of the following best helps to account for the fact that the F- ion is smaller than the O2- ion?

katrin [286]

Answer: Option (B) is the correct answer.

Explanation:

Both oxygen and fluorine are period 2 elements and when we move across a period then there occurs a decrease in atomic size of the atoms. Hence, the atomic radius of a neutral fluorine atom is smaller than a neutral oxygen atom.

Moreover, atomic number of fluorine is 9 and it has higher nuclear charge due to which it will cause more attraction of electrons. As a result, size of a fluorine ion will be smaller.

On the other hand, size of oxygen atom is larger and has small nuclear charge due to which attraction of electrons by its nucleus will not be strong enough. Hence, the size of $O^{2-}$ will be larger.

Thus, we can conclude that the statement $F^{-}$ has a larger nuclear charge than $O^{2-}$ has, is correct for the fact that the $F^{-}$ ion is smaller than the $O^{2-}$ ion.

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r-ruslan [8.4K]

Answer:

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Explanation:

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