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Archy [21]
3 years ago
10

How did life begin? need asap

Chemistry
2 answers:
3241004551 [841]3 years ago
5 0

From KimbeKimbe21 in a comment section found on the page:

"The earth began to be formed over 4.5 billion years ago,but for millions of years nothing could live here.Gradually,the earth's crust and the atmosphere formed.The simplest fo…rm of life, bacteria and algae,probably began to grow less than four billion years ago.Human beings did not appear until about two million years ago."

stealth61 [152]3 years ago
4 0
Birds and bees. Adam and Eve
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Thermal energy would naturally flow between objects at which temperatures?
marissa [1.9K]

Answer:

i think the answer is letter C. From 35°c to 45°c

Explanation:

sorry if it is wrong

4 0
3 years ago
You have a cup of hot water and you dissolve as much salt in it as possible. You then put the cup into the refrigerator and you
hoa [83]
Some of the salt would settle out. When the water was heated, it was able to absorb more salt than usual. This is known as super saturation. When the water is frozen it cannot hold as much salt, so some of it has to come out.
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a hot air balloon has a volume of 875L. what is the original temperature of the balloon if its volume changes to 955 L when heat
soldi70 [24.7K]

Answer:

using Charles law

v1/t1= v2/ t2

Explanation:

875/t1=955/56+273

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4 0
3 years ago
A mixture of hydrogen (2.02 g) and chlorine (35.90 g) in a container at 300 K has a total gas pressure of 748 mm Hg. What is the
Llana [10]

The partial atmospheric pressure (atm) of hydrogen in the mixture is 0.59 atm.

<h3>How do we calculate the partial pressure of gas?</h3>

Partial pressure of particular gas will be calculated as:

p = nP, where

  • P = total pressure = 748 mmHg
  • n is the mole fraction which can be calculated as:
  • n = moles of gas / total moles of gas

Moles will be calculated as:

  • n = W/M, where
  • W = given mass
  • M = molar mass

Moles of Hydrogen gas = 2.02g / 2.014g/mol = 1 mole

Moles of Chlorine gas = 35.90g / 70.9g/mol = 0.5 mole

Mole fraction of hydrogen = 1 / (1+0.5) = 0.6

Partial pressure of hydrogen = (0.6)(748) = 448.8 mmHg = 0.59 atm

Hence, required partial atmospheric pressure of hydrogen is 0.59 atm.

To know more about partial pressure, visit the below link:
brainly.com/question/15302032

#SPJ1

3 0
2 years ago
Which of the following is a strong base?
malfutka [58]
C. NaOH ammmonia is also an base but not as strong as NaOH
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