CHEMISTRY HIGH SCHOOL

Permafrost soil (gelisol) is _______.a. resistant to erosion
b. fragile
c. rich in microorganisms
d. a fast developing soil.

Answers

Answer 1
Answer: Permafrost soil (gelisol) is b) fragile. 
Answer 2
Answer:

Option B, fragile, is the right answer.

The Permafrost soil (Gelisol) are found very harsh and cold weather such as Arctic and Antarctic. The Gelisol are simply corroded soils, fragile and their finding near the extreme ice covers presents them valuable indicators of the early symbols of global warming. Permafrost in these soils found within two meters of the surface of the soil.

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A carbon-12 atom has a mass of 12.00000 amu. The mass of a proton is 1.00728 amu, and the mass of a neutron is 1.00866 amu. How many protons does the carbon-12 atom have? How many neutrons does the carbon-12 atom have? What is the mass defect of a carbon-12 atom? amu

Answers

A carbon - 12 atom and a regular carbon atom would have the same number of protons which is 6. So a carbon - 12 atom would have 6 protons. Both, however, would differ in the number of neutrons. Carbon - 12 atom has 6 neutrons. To determine the mass defect of a carbon - 12 atom, we have to add the total mass of protons and the total mass of neutrons and subtract the known mass of a carbon - 12 atom. That would be like this.
6 (1.00728 amu) + 6 (1.00866 amu) = x
6.04368 amu + 6.05196 amu = x
12.09564 amu = x

Then subtract it with 12 amu to get the defect mass

12.09564 amu - 12.00000 amu = y
0.09564 amu = y

So the defect mass would be 0.09564 amu.

1) The number of protons in an element defines its atomic number, and for carbon, it is 6. 2) Number of neutrons in a carbon-12 atom is 6. 3) The mass defect of a carbon-12 atom is 0.09564 amu.

To determine the number of protons and neutrons in a carbon-12 atom and the mass defect, we need to use the given atomic masses of a proton and a neutron.

Number of protons in a carbon-12 atom:

Carbon-12 is the most common isotope of carbon, and it contains 6 protons. The number of protons in an element defines its atomic number, and for carbon, it is 6.

Number of neutrons in a carbon-12 atom:

The mass number of an isotope will be the sum of protons as well as neutrons in its nucleus. For carbon-12, the mass number is 12 amu. Since we already know it has 6 protons, the number of neutrons can be calculated as follows:

Number of neutrons = Mass number-Number of protons

Number of neutrons = 12 amu-6 protons

Number of neutrons = 6 neutrons

Mass defect of a carbon-12 atom:

The mass defect is the difference between the actual mass of a nucleus and the sum of the masses of its individual protons and neutrons.

Mass defect = (Mass of protons + Mass of neutrons) - Actual mass of carbon-12

Mass of protons = 6 protons × 1.00728 amu/proton = 6.04368 amu

Mass of neutrons = 6 neutrons × 1.00866 amu/neutron = 6.05196 amu

Actual mass of carbon-12 = 12.00000 amu

Mass defect = (6.04368 amu + 6.05196 amu) - 12.00000 amu

Mass defect = 12.09564 amu - 12.00000 amu

Mass defect = 0.09564 amu

So, the mass defect of a carbon-12 atom is 0.09564 amu.

To know more about mass defect here

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At equilibrium, a sample of gas from the system is collected into a 4.00 L flask at 600 K. The flask is found to contain 3.86 g of PCl₅, 12.7 g of PCl₃, and 13.3 g of Cl₂. What are the values of Kc and Kp for this reaction?

Answers

Answer:

Explanation:

                                             PCl₅    ⇄    PCl₃    +     Cl₂

                                           1 mole         1 mole        1 mole

molecular weight of  PCl₅ = 208.5

molecular weight of PCl₃  = 137.5

molecular weight of Cl₂  =       71

moles of PCl₅ = .0185

moles of PCl₃ = .0924

moles of Cl₂ = .1873

Total moles = .2982 moles

mole fraction of PCl₅ = .062

mole fraction of  PCl₃ = .31

mole fraction of Cl₂ = .628

If total pressure be P

partial pressure of  PCl₅ = .062 P

partial pressure of  PCl₃ = .31 P

partial pressure of  Cl₂ = .628 P

Kp = .31 P  x  .628 P /  .062 P

= 3.14 P

To calculate Total pressure P

PV = nRT

P x 4 x 10⁻³ = .2982 x 8.31  x 600

P = 371.7 x 10³

= 3.717 x 10⁵ Pa

Kp = 3.14 P = 3.14 x  3.717 x 10⁵ Pa

= 11.67 x 10⁵ Pa

Kp  = Kc x ( RT )^(\triangle n)

\triangle n = 1

11.67 x 10⁵ = Kc x ( 8.31* 600 )^(1)

Kc = 234

Which of the following statements describes a scientific law?a. A scientific law explains a set of events.
b. A scientific law describes what occurs every time in a situation.
c. A scientific law is constantly modified.
d. A scientific law is developed without experimentation.

Answers

The correct answer is B.

scientific law which describes what occurs every time in a situation. Scientific law always applies under same condition.


Laws differs from scientific theory because they does not posit explanation of phenomena.

Different laws takes mathematical forms. Scientific law is being associated with natural science but social sciences also contains laws.


A good example of scientific law in social sciences is Zipf's law.

Answer:

B. a law is a proven fact that cannot be changed.

Explanation:

Which structural formula correctly represents an organic compound

Answers

A skeletal formula is usually used for organic compounds

What is the chemical formula for iron(III) oxide?
(1) FeO (3) Fe3O
(2) Fe2O3 (4) Fe3O=

Answers

The chemical formula for Iron (III) oxide is Fe203.

An organic molecule is likely to contain all of these elements except: Answer C H O Ne N

Answers

Organic molecules typically do not contain the noble gases, so they would contain all but Ne
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