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Aleks04 [339]
3 years ago
5

Which statement is true in a convection cell? A. Air at the equator rises. B. Air at the poles rises. C. Air at the equator sink

s. D. Air rises at both the poles and the equator.
Chemistry
2 answers:
Verdich [7]3 years ago
6 0
The correct option is A.
In the convection cell, cold air sinks at the poles because of their high pressure. As the air moves away from the poles along the earth surface, it begins to get warm and its pressure reduces. Convection cells are circular pattern of wind which are caused by the rising and sinking of wind.
leva [86]3 years ago
5 0
A. In the convection current, the less dense, warmer air, rises, while the cold air sinks because it's more dense. I hope this helps.
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What is shown by the structural formula of a molecule or polyatomic ion?
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Answer : Option A) the arrangement of bonded atoms.


Explanation : A structural formula of certain molecule depicts the way the atoms are arranged in that particular molecule in any polyatomic species. It helps in deciding the chemical properties of that polyatomic molecule.
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How many moles of glucose (C6H12O6) are in 5.0 liters of a 2.5 M C6H12O6 solution?
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3 years ago
(06.04 HC)
Ksju [112]

The mass of sodium chloride at the two parts are mathematically given as

  • m=10,688.18g
  • mass of Nacl(m)=39.15g

<h3>What is the mass of sodium chloride that can react with the same volume of fluorine gas at STP?</h3>

Generally, the equation for ideal gas is mathematically given as

PV=nRT

Where the chemical equation is

F2 + 2NaCl → Cl2 + 2NaF

Therefore

1.50x15=m/M *(1.50*0.0821)

1-50 x 15=m/58.5 *(1.50*0.0821)

m=10,688.18g

Part 2

PV=m'/MRT

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m'=39.15g

mass of Nacl(m)=m'=39.15g

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Which statements accurately describe Dmitri Mendeleev’s contributions to the development of the periodic table? Check all that a
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Answer:

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  • <em><u>Mendeleev used patterns to predict undiscovered elements.</u></em>

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        Those two statments are true.

For the time being there were some 62 known elements. Before Medeleev some schemes to order part of the elements were proposed, but Medeleev showed the relationship between the atomic mass and the properties of the elements (supports second choice). This arrangement is known as the periodic table.

More importantly, Mendeleev predicted correctly the existance and properties of unknown elements, which is his major contribution: he left blanket spaces which where gradually filled when new elements where discovered (this supports the fourth choice).

The first modern chemistry book was written by Antoine Lavoisier (this discards first option).

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