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3 years ago

Please help , I don't know about big bang I'm sorry

Chemistry

1 answer:

Tresset [83]3 years ago

3 0

1. When our Galaxy was forming why was the center dense?

Answer: <u>Stars are believed to originate as from gas clouds in space. Gravitational forces cause this gas to contract forming a dense center of gravitational force.Eventually this extreme pressure at the center of the star causes nuclear fusion reactions to occur.</u>

2. Why did hydrogen atoms collide in the dense center of the Galaxy?

Answer: <u>Compression would heat the gas to temperatures above 1,000 kelvins. Some hydrogen atoms would pair up in the dense, hot gas, creating trace amounts of molecular hydrogen. The hydrogen molecules would then start to cool the densest parts of the gas by emitting infrared radiation after they collide with hydrogen atoms.</u>

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2 years ago

Which statement is accurate for these two sub-atomic particles.

krek1111 [17]

Answer:

The correct answer is "They are both located in the nucleus".

Explanation:

I had to look for the problem and found that the particles are a Proton and a Neutron.

The atomic nucleus is the central section of an atom, is positively charged and has almost the entire mass of the atom.

The nucleus is formed by protons and neutrons, which are held together by strong nuclear interaction, which allows the nucleus to be stable.

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4 years ago

A 13.5 g sample of an unknown gas occupies 5.10 L at 149.83 kPa and 301 K. What is the molar mass of the gas ?

alisha [4.7K]

Answer:

The molar mass of the gas is 44.19 g/mol

Explanation:

Amount of sample of gas = m = 13.5 g

Volume occupied by the gas = V = 5.10 L

Pressure of the gas = P = 149.83 KPa

1 KPa = 0.00986 atm

P = $149.83 \textrm{ KPa} \times 0.00986 \textrm{ atm/KPa} = 1.48 \textrm{ atm}$

Assuming M g/mol to be the molar mass of the gas

Assuming the gas is behaving as an ideal gas

$\textrm{PV} =\textrm{nRT} \\\textrm{PV} = \displaystyle \frac{m}{M}\textrm{ RT } \\1.48 \textrm{ atm}\times 5.10 \textrm{ L} = \displaystyle \frac{13.5 \textrm{ g}}{M}\times 0.0821 \textrm{ L.atm.mol}^{-1}.K^{-1}\times 301\textrm{K} \\M = 44.19 \textrm{ g/mol}$

The molar mass of gas is 44.19 g/mol

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3 years ago

Referring to an activity series, which of the following combinations of reactants would not produce a successful single-replacem

Rom4ik [11]

B) Cu + CaCl2
hope it helps

6 0

4 years ago

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A substance has a boiling point of 78 °C. Which of the following is true about the substance?

laila [671]

Answer: C; it will also change from a gas to a liquid at 78°C while the gas loses energy.

Explanation:

Took the test. If it boils at 78°C, then that means it will be either a liquid turning into a gas, or a gas turning into a liquid. If the gas loses energy, that means it is being cooled, so if a gas loses energy at 78°C, it will become a liquid.

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3 years ago

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