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andriy [413]
4 years ago
14

In the paleoatmosphere, the primary gases were _____. oxygen, carbon dioxide, nitrogen carbon dioxide, nitrogen, and water vapor

oxygen and water vapor carbon dioxide and oxygen
Chemistry
2 answers:
umka21 [38]4 years ago
8 0
In the paleoatmosphere, the primary gases were carbon dioxide, nitrogen, and water vapor. 
Darina [25.2K]4 years ago
6 0

The paleoatmosphere refers to the Earth’s atmosphere in the geological past. The paleoatmosphere was dominated by nitrogen, carbon dioxide and methane. These gases are generated by the radioactive decay of Potassium. During this pre-biological atmosphere, it is thought to have been reducing, to have highly contained virtually no free oxygen, and virtually no argon. Therefore the major gases on this period are the Nitrogen and Carbon Dioxide.

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What is the molarity of a 750 milliliters solution containing 54.0 grams of KBr (help me please)
ololo11 [35]

<u>Answer:</u> The molarity of KBr solution is 0.605 M

<u>Explanation:</u>

Molarity is defined as the amount of solute expressed in the number of moles present per liter of solution. The units of molarity are mol/L.

The formula used to calculate molarity:

\text{Molarity of solution}=\frac{\text{Given mass of solute}\times 1000}{\text{Molar mass of solute}\times \text{Volume of solution (mL)}}       .....(1)

Given values:

Given mass of KBr = 54.0 g

Molar mass of KBr = 119 g/mol

Volume of the solution = 750 mL

Putting values in equation 1, we get:

\text{Molarity of solution}=\frac{54.0\times 1000}{119\times 750}\\\\\text{Molarity of solution}=0.605M

Hence, the molarity of KBr solution is 0.605 M

7 0
3 years ago
if you had to explain to someone the difference between heat and temperature, how could you use one of the following to demonstr
Rainbow [258]

Answer:

We associate paper money or points in video games, as molecules that make a heat transfer or an increasin in its temperature.

Explanation:

The meaning of heat is associated with an energy transfer, where for example if we put a spoon in a cup of hot drink, the drink will be transferring heat to the spoon. It is a transfer of energy between two bodies due to a difference between their temperatures.

Temperature is associated with the movement of kinetic energy of the molecules. When the temperature is higher, the kinetic energy is higher, so as more detained they are, temperature will be lower.

If we take paper money as molecules, the greater movement of money explains that we have an increase in temperature (we would be hot), even if we think of video games, for example gambling where as more points we gain, we generate an increase in the movement of "molecules".

When we use paper money to buy something we are doing a heat transfer.

We can associate terms to the Thermodynamic where

Heat = Internal energy + work

For clearance would be

Internal energy = Heat - Work

The money we use less the work we do keeps our internal energy. If in a gambling video game, we earn points over and over again, when withdrawing the prize we perform "heat transfer".

4 0
3 years ago
Someone can help me please??
kramer

C to D

Explanation:

it rises faster between those two points

4 0
3 years ago
Read 2 more answers
Determine the mass percent composition of a solution made by dissolving 40.1g of LiOH in 681g of H2O
Lapatulllka [165]
<h3>Answer:</h3>

5.89%

<h3>Explanation:</h3>

We are given;

  • Mass of the solute, LiOH as 40.1 g
  • Mass of the solvent, H₂O as 681 g

We are required to calculate the mass percent composition of solution;

  • But; How do we calculate the mass percent composition of a solution?
  • We use the formula;
  • Mass composition of a solution = (Mass of solute/mass of solution) 100%
  • Therefore;

Mass Percent = (40.1 g/681 g)× 100%

                       = 5.888 %

                       = 5.89%

Therefore, the mass percent composition of the solution is 5.89%

7 0
3 years ago
What system maintain the pH of human blood at very near 7.4?
koban [17]

<span>Buffer systems in our body maintain the pH of blood to be at an optimum level which is at a range of 7.3-7.4. A buffer is a solution that resists changes in pH during the addition of an acid or a base. Our blood has a number of buffer systems. Examples are the bicarbonate buffer system and the hemoglobin buffer system.</span>

5 0
3 years ago
Read 2 more answers
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