How many electrons are in an Fe2+ ion?
(1) 24 (3) 28
(2) 26 (4) 56

Answers

Answer 1

Answer:

Iron atoms all have 26 protons, however Fe²⁺ and Fe³⁺ only have 24 and 23 electrons, respectively, and elemental uncharged Fe contains 26 electrons.

What is an electron ?

The elementary electric charge of the electron is a negative one, making it a subatomic particle. Due to their lack of components or substructure, electrons, which are members of the lepton particle family's first generation, are typically regarded to be elementary particles.

After the 4s orbitals are full, they fill the 3d orbitals. However, when they are ionized, their electrons only fill the ground state 3d orbitals. Iron (II) ion will thus contain four unpaired electrons.

Quarks make up protons and neutrons, but not electrons. We believe that quarks and electrons are basic particles that are not composed of lesser subatomic particles.

Thus, option 2 is correct.

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Answer 2

Answer: Atomic number of iron = 26
Number of protons in the neucleus = 26
Number of electrons in a neutral Fe atom = 26
Number of electrons in Fe2+ ion = 26 - 2 = 24

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What is the chemical reaction for Mg + NaOH also with the ionic equations and subscripts?

Answers

The chemical reaction for Mg + NaOH is

Mg (s) + NaOH (aq) -> Mg (OH)2 (s) + Na (aq)
s stands for solid, aq stands for aqueous

At standard pressure, the total amount of heat required to completely vaporize a 100. gram sample of water at its boiling point is(1) 2.26 X 10 J (3) 2.26 X 103 J(2) 2.26 X 102 J (4) 2.26 X 105 J

Answers

During phase transformation Temperature remains same, as the extra heat goes into breaking the force of attraction between the particles. the correct option is option (4) that is 2.26×10⁵ J.

What is heat of vaporization?

Heat of vaporization is the amount of energy or heat that is required to break the force of attraction between the particles to convert liquid into vapors. Vaporization is an endothermic reaction. So the amount of energy that is required over here is positive. Heat of condensation is negative that is heat is released during reaction.

We know that the heat of vaporization of water is 2260 J/g. So, the total amount of heat required to completely vaporize a 100gram sample of water at its boiling point is 2260×00=2.26×10⁵ J.

Thus the correct option is option (4)

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We know that the heat of vaporization of water is 2260 J/g. So 100 gram sample of water being completely vaporized needs 2260*100=2.26*10^5 J. So the answer is (4).

What role in photosynthesis does chlorophyll play

Answers

a green pigment, present in all green plants and in cyanobacteria, responsible for the absorption of light to provide energy for photosynthesis. Its molecule contains a magnesium atom held in a porphyrin ring.

The amount of heat energy required to raise the temperature of a unit mass of a material one degree isA. absolute zero.
B. a Joule.
C. its heat capacity.
D. a Btu.

Answers

i think its B- A Joule

the formula C=5/9 (F - 32) can be used to convert a temperature from degrees Fahrenheit to degrees Celsius. which of the following is closest In value to 5/9?

Answers

F = $(9)/(5) c$ +32

Enter the temperature into the degrees Celsius (C) equal to 113∘ Fahrenheit (F). The formula F = 1.8°C + 32 allows you to find the Fahrenheit (F) temperature for a given Celsius (C) temperature.

Given: C = $\frac{5}9}$ (F - 32)

First, multiply both sides by $(9)/(5)$ to get:

$(9)/(5) c$ = F - 32

Add 32 to both sides and transpose to get:

F = $(9)/(5)c$ + 32

These are the formulas to translate between Fahrenheit and Celsius temperatures.

Fahrenheit and Celsius meet at −40 degrees.

That is −40∘ F = −40∘C

So alternative formulas for the conversions can be written:

F = $(9)/(5)$ (C + 40) − 40

C = $(5)/(9)$ (F +40) − 40

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F= 1.8C+32 or C= F-32/1.8

Which statement correctly describes a solution with a pH of 9?(1) It has a higher concentration of H3O+ than OH– and causes litmus to turn blue.
(2) It has a higher concentration of OH– than H3O+ and causes litmus to turn blue.
(3) It has a higher concentration of H3O+ than OH– and causes methyl orange to turn yellow.
(4) It has a higher concentration of OH– than H3O+ and causes methyl orange to turn red.

Answers

A solution with a pH of 9 will have a higher concentration of $OH^-$ and will turn red litmus to blue.

What is pH

It is the degree of acidity or alkalinity of substances.

A pH of 7 is neutral, below 7 is acidic, and above 7 is alkaline or basic.

A base generally have $OH^-$ as the only negative ions when ionized in aqueous solutions. Bases also turn red litmus to blue.

Thus, a solution with a pH of 9 will have a higher concentration of $OH^-$ and will turn red litmus to blue.

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Answer: Option (2) is the correct answer.

Explanation:

It is known that when pH of a solution is less than 7 then the solution is acidic in nature and turns blue litmus into red. Whereas when pH of a solution is more than 7 then the solution is basic in nature and turns red litmus into blue.

Hydrogen ions can also be released in the form of hydronium ions ( $H_(3)O^(+)$ ).

And, when a solution has pH 9 then it means the solution is basic in nature.

That is, there will be more number of hydroxide or $OH^(-)$ ions as compared to hydrogen ions or $H_(3)O^(+)$ ions.

Thus, we can conclude that the statement it has a higher concentration of OH– than H3O+ and causes litmus to turn blue correctly describes a solution with a pH of 9.

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