CHEMISTRY HIGH SCHOOL

If a shell can hold a maximum of 32 electrons, what is the value of n?

Answers

Answer 1
Answer:
In my textbook it says that the maximum number of electrons that can fit in any given shell is given by 2n². Which would mean 2 electrons could fit in the first shell, 8 could fit in the second shell, 18 in the third shell, and 32 in the fourth shell. However, I was previously taught that the maximum number of electrons in the first orbit is 2, 8 in the second orbit, 8 in the third shell, 18 in the fourth orbit, 18 in the fifth orbit, 32 in the sixth orbit. I am fairly sure that orbits and shells are the same thing.

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Martin uses 5/8 of a gallon of paint to cover4/5 of a wall. What is the unit rate at which Martin paints in walls per gallon

Answers

Answer:

Unit rate at which Martin paints in walls per gallon is (32)/(25) wall/gallon.

Explanation:

Rate is defined as ratio between two quantities with different units.

Gallons of paint used by Martin = (5)/(8) gallons

Portion of wall Martin wishes to pint = (4)/(5) wall

Rate at which Martin paints the wall:

Rate=\frac{\text{Portion of wall covered}}{\text{Paint used}}

Rate=((4)/(5) wall)/((5)/(8) gallon)=(32)/(25) wall/gallon

Unit rate at which Martin paints in walls per gallon is (32)/(25) wall/gallon.

3. Sulfur dioxide (SO2) can be reduced by hydrogen disulfide (H2S), producing sulfur in its elemental form and water (H2O). Using Hess’s law and the reactions below, determine the overall enthalpy for the reaction between SO2 and H2S. Make to clearly show your work.H2 (g) + S (s) → H2S (g) ΔH = –20.6 kJ
SO2 (g) → S (s) + O2 (g) ΔH = +296.8 kJ
2H2 (g) + O2 (g) → 2H2O (g) ΔH = –285.8 kJ

Answers

The reaction between h2s and so2 results to h20 and elemental sulfur. The final reaction is SO2 +2H2S = 3S+ 2H2O. Using Hess law, the first equation is reversed and multiplied by 2, the second and the third equation remains the same. Calculating the overall enthalpy, the answer is 52.2 kJ. 

How many moles of atoms are in 7.00 g of 13c? express your answer numerically in moles?

Answers

molar mass of 13c = 13 grams
number of moles = mass / molar mass
therefore,
number of moles = 7 / 13
To know the number of atoms in 7/13 moles, we simply multiply the number of moles by Avogadro's number as follows:
number of atoms = (7/13) x 6.022 x 10^23 = 3.2426 x 10^23 atoms

There are 0.538 moles of ¹³C atoms in the given 7.00 g sample.

Further Explanation

This is a simple mole conversion problem.  It requires the molar mass, or the mass of one mole of a substance, of carbon - 13, an isotope of carbon. An isotope is like a different version of a specific atom. In this case, carbon - 13 is a version of a carbon atom that has one more neutron than the normal carbon atom. It is a little heavier than the normal carbon atom because of its extra neutron.

Converting Mass to Moles

To convert from grams of sample to moles of sample, the general equation is:

moles \ of \ sample = (given \ mass)/(molar \ mass)

To convert 7.00 g of ¹³C, the equation is:

mole \ of \ ^(13)C \ = (7.00 \ g)/(13.00 \ (g)/(mol)) \n\boxed {mole \ of \ ^(13)C \ = 0.53846 \ mol}

Since there is only 3 significant figures in the given, the final answer must also have 3 significant figures. Therefore,

\boxed {\boxed {mole \ of \ ^(13)C \ = 0.538 \ mol \ or \ 5.38 * 10^(-1) \ mol}}

This answer is logical since one mole of ¹³C will have a mass of 13.00 g. The given sample (7.00 g) is less than 13.00 g so the mole equivalent of that should be less than one mole.

Learn More

  1. mole conversion  brainly.com/question/12980009
  2. stoichiometry brainly.com/question/10513747

Keywords: moles, molar mass

Doesn't hydrogen have one energy level assuming that we only have one electron and not an ion?

Answers

It may have one occupied energy level at a time since it only has one electron, but overall it has several energy levels.
Yes, Hydrogen has one energy level, (an S sub-level that can fill up to two electrons).

The only other confusing thing about Hydrogen I can think of, is that you will almost never find it existing as a single Hydrogen, but as H2....

If 20 atoms of aluminum react with 45 molecules of chlorine gas, which reactant is limiting and how many more atoms/molecules would be required to use up all the reactants?

Answers

Explanation:

2Al+3Cl_2\rightarrow 2AlCl_3

According to reaction, 2 atoms of aluminum gas reacts with 3 molecules of chlorine gas.

Then 20 atoms of aluminum will react with :

(3)/(2)* 20=30 molecules of chlorine

Aluminum is a limiting reagent.

Molecules of chlorine left unreacted: 45 - 30  molecules = 15 molecules

Then 15 molecules of chlorine gas will react with :

(2)/(3)* 15=10 atoms of aluminum

10 more atoms of aluminum will required to use up all chlorine.
Al:ch2 an molar ratio.

2:3 and an x. X is 30.  20/2 = 10 so an answer is 

45/3 = 15. Both ratios are used 

45 - 30 = 15 CL2 left.

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Which of these features was formed by hotspot volcanism?The Grand Canyon
The Big Island of Hawaii
The Appalachian Mountains
The Himalaya Mountain Range

Answers

These feature that was formed by hotspot volcanism is The Big Island of Hawaii. The Hawaiian Islands are actually found at the tip of several volcanoes that has been formed by a series of volcanic eruptions. Today, the Big Island sits on the hotspot, and contains the only active volcanoes of the group of islands.
The Big Island of Hawaii was formed by hotspot volcanism, whereas The Grand Canyon, The Appalachian Mountains, and The Himalaya Mountain Range were not.
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