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2 years ago

List evidence that supports the Big Bang Theory.

Chemistry

2 answers:

Novay_Z [31]2 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]2 years ago

5 0

The redshift of distant galaxies means that the Universe is probably 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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46.6 grams of mercury II sulfate (HgSO4) reacts with an excess of sodium Chloride (NaCl). How many grams of mercury II chloride

slega [8]

Answer:

$m_{HgCl_2}=42.7gHgCl_2$

Explanation:

Hello,

In this case, the undergoing chemical reaction is:

$HgSO_4+2NaCl\rightarrow HgCl_2+Na_2SO_4$

In such a way, the mercury II sulfate (molar mass 296.65g/mol) is in a 1:1 molar ratio with the mercury II chloride (molar mass 271.52g/mol), for that reason the stoichiometry to find mass in grams of mercury II chloride turns out:

$m_{HgCl_2}=46.6gHgSO_4*\frac{1molHgSO_4}{296.65 gHgSO_4}*\frac{1molHgCl_2}{1molHgSO_4} *\frac{271.52gHgCl_2}{1molHgCl_2} \\\\m_{HgCl_2}=42.7gHgCl_2$

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3 0

2 years ago

Which of these is a carbohydrate?

Paladinen [302]

Answer:

C6H12O6

Glucose

Explanation:

Glucose is a monocarbohydrate

carbohydrates always have only C, H, and O

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6 0

2 years ago

Due to radioactive decay over many millions of years, it is possible for the element uranium to decay in

ruslelena [56]

The uranium within these items is radioactive and should be treated with care. Uranium's most stable isotope, uranium-238, has a half-life of about 4,468,000,000 years. It decays into thorium-234 through alpha decay or decays through spontaneous fission.

3 0

2 years ago

What mass of sodium chloride (NaCl) forms when 7.5 g of sodium carbonate (Na2CO3) reacts with a dilute solution of hydrochloric

Gre4nikov [31]

The mass of NaCl formed is 8.307 grams

calculation

step 1: write the equation for reaction

Na₂CO₃ + 2HCl → 2 NaCl +CO₂ +H₂O

Step 2: find the moles of Na₂CO₃

moles = mass/molar mass

The molar mass of Na₂CO₃ is = (23 x2) + 12 + ( 16 x3) = 106 g/mol

moles = 7.5 g/106 g/mol =0.071 moles

Step 3: use the mole ratio to determine the mole of NaCl

Na₂CO₃:NaCl is 1:2 therefore the moles of NaCl =0.07 x2 =0.142 moles

Step 4: calculate mass of NaCl

mass= moles x molar mass

the molar mass of NaCl= 23 +35.5 =58.5 g/mol

mass = 0.142 moles x 58.5 g/mol =8.307 grams

8 0

2 years ago

Read 2 more answers

A sample of a pure element has a mass of 45.6g and contains 4.19 x 10 23 atoms. Identify the element.

max2010maxim [7]

<h2>Answer:</h2>

ZINC

<h2>Explanation:</h2>

To identify the element based on the informartion given, we have to find the molar mass since this mass is unique to each element.

Molar mass = mass ÷ moles

We already know the mass based on the question, as such we now need to find the # of moles.

Since 1 mole contains 6.02214 × 10²³ atoms

then let x moles contain 4.19 × 10²³ atoms (given in the question)

  ⇒ x = (4.19 × 10²³ atoms × 1 mol) ÷ 6.02214 × 10²³ atoms

x = 0.69577 mol

Now that we have the moles we can substitute it into the molar mass equation and solve for the molar mass.

⇒ molar mass = 45.6 g ÷ 0.69577 mol

⇒ molar mass ≈ 65.54 g/mol

This molar mass is closest to that of ZINC.

7 0

2 years ago