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goldfiish [28.3K]
3 years ago
14

How can an electron cloud be compared with a spinning airplane propeller? Both represent objects that move in a circular motion

around a central core. Exact locations within either cannot be determined at any given moment in time. Either model can be used to picture the shape of an atom.
Chemistry
2 answers:
adelina 88 [10]3 years ago
6 0

The answer is that exact locations within either cannot be determined at any given moment in time.

An electron cloud be compared with a spinning airplane propeller in the manner that in both exact location within either cannot be determined at any given moment in time.

In both electron cloud as well as spinning airplane propeller, there is a probability of finding either but exact location can not be determined.


Serhud [2]3 years ago
5 0

Answer: Option (b) is the correct answer.

Explanation:

It is known that an atom has protons, neutrons and electrons as subatomic particles.

Protons and neutrons are placed inside nucleus of an atom whereas electrons revolve around the nucleus.

Therefore, when a spinning airplane propeller is compared with a spinning electron then it means the propeller also moves in circular motion with a high speed.

Therefore, we cannot tell the exact location of propeller at any given moment in time.

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What does the mass number of an atom represent?.
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the sum of the numbers of protons and neutrons present in the nucleus of an atom.

8 0
2 years ago
What is the mass of KOH found in a 785 mL of a 1.43 M solution of KOH
My name is Ann [436]

Molarity is defined as the ratio of number of moles to the volume of solution in litres.

The mathematical expression is given as:

Molarity = \frac{Number of moles}{volume of solution in litres}

Here, molarity is equal to 1.43 M and volume is equal to 785 mL.

Convert mL into L

As, 1 mL = 0.001 L

Thus, volume = 785\times 0.001 = 0.785 L

Rearrange the formula of molarity in terms of number of moles:

Number of moles =molarity\times volume of solution in litres

n = 1.43 M \times 0.785 L

= 1.12255 mole

Now,  Number of moles  = \frac{mass in g}{molar mass}

Molar mass of potassium hydroxide  = 56.10 g/mol

1.12255 mole  = \frac{mass in g}{56.10 g/mol}

mass in g = 1.12255 mole\times 56.10 g/mol

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7 0
3 years ago
What amount (moles) is represented by each of these samples?
Zinaida [17]
<h3>Answer:</h3>

                  a)  Moles of Caffeine  =  1.0 × 10⁻⁴ mol

                  b) Moles of Ethanol   =  4.5 × 10⁻³ mol

<h3>Solution:</h3>

Data Given:

                  Mass of Caffeine  =  20 mg  =  0.02 g

                  M.Mass of Caffeine  =  194.19 g.mol⁻¹

                  Molecules of Ethanol  =  2.72 × 10²¹

Calculate Moles of Caffeine as,

                               Moles  =  Mass ÷ M.Mass

Putting values,

                               Moles  =  0.02 g ÷ 194.19 g.mol⁻¹

                                Moles  =  1.0 × 10⁻⁴ mol

Calculate Moles of Ethanol as,

                                                         As we know one mole of any substance contains 6.022 × 10²³ particles (atoms, ions, molecules or formula units). This number is also called as Avogadro's Number.

The relation between Moles, Number of Particles and Avogadro's Number is given as,

                          Number of Moles  =  Number of Molecules ÷ 6.022 × 10²³

Putting values,

                          Number of Moles  =  2.72 × 10²¹ Molecules ÷ 6.022 × 10²³

                          Number of Moles  =  4.5 × 10⁻³ Moles

5 0
3 years ago
I need to show work on all my problems and I am not God in math
Salsk061 [2.6K]
That's cool man, you should study more... wheres the question though?
6 0
3 years ago
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