Which is the correct Lewis dot structure of NH2?

A.A
B.B
C.C
D.D
E.E

Answer:

pH = 5.5 and it is an acid

Explanation:

Fr the question given above, the following data were obtained:

poH = 8.5

pH =?

pH + pOH = 14

pH + 8.5 = 14

Collect like terms

pH = 14 – 8.5

pH = 5.5

pH scale reads as follow:

0 to 6 => Acidic

7 => Neutral

8 to 14 => Basic

With the above pH scale, we can conclude that the solution with pH 5.5 is acidic.

Answer:

Kb=x^2/0.42-x (eqn to calculate)

basicity (pkb) 9.3

Explanation:

A common ancestor is an organism that is the direct ancestor of two or more different organisms.

A common ancestor refers to an organism that is shared by multiple organisms, serving as the direct predecessor to those organisms. It is the point in evolutionary history where two or more distinct lineages diverged from a single ancestral lineage. This means that the common ancestor is the starting point from which different species or groups of organisms evolved over time.

In the context of evolution, organisms share common ancestry due to the process of descent with modification. Through genetic inheritance and gradual changes in traits over generations, new species arise from a common ancestor. As these species undergo divergent evolution, they develop distinct characteristics and adaptations, eventually becoming separate lineages.

Hence, the correct option is the direct ancestor of two or more different organisms.

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Answer:

[tex]x=27,8[/tex]

Explanation:

The equation is

[tex]x^{\dfrac{2}{3}}-5x^{\dfrac{1}{3}}+6=0[/tex]

Let,

[tex]x^{\dfrac{1}{3}}=y[/tex]

So,

[tex]y^2-5y+6=0\\\Rightarrow y=\dfrac{-\left(-5\right)\pm \sqrt{\left(-5\right)^2-4\times 1\times 6}}{2\times 1}\\\Rightarrow y=3,2[/tex]

[tex]x^{\dfrac{1}{3}}=y\\\Rightarrow y^3=x\\\Rightarrow x=3^3\\\Rightarrow x=27[/tex]

[tex]x=2^3\\\Rightarrow x=8[/tex]

Hence, [tex]x=27,8[/tex].

Answer:

0.4 kg/m^3

Explanation:

v (volume) = 20m x 10m x 5m = 1000 m^3

w (weight) = 400 kg

d (density) = w / v

d = 400 / 1000 = 0.4 kg per cubic meter (kg/m^3)

I apologize if this is a little complex, however all of the math is there, if you're interested then look it over. Otherwise I've provided the answer in the units used for the dimensions and weight provided.

Answer:

[tex]OH^-(aq)+H^+(aq)\rightarrow H_2O(l)[/tex]

Explanation:

Hello there!

In this case, according to the given reactants, it is firstly necessary to set up the complete molecular reaction:

[tex]NH_4OH(aq)+HClO_4(aq)\rightarrow NH_4ClO_4(aq)+H_2O(l)[/tex]

Now, by knowing that ionic species are able to ionize, we are able to write the complete ionic equation:

[tex]NH_4^++OH^-+H^++ClO_4^-\rightarrow NH_4^++ClO_4^-+H_2O(l)[/tex]

Whereas ammonium and chlorate ions are spectator ions because they remain the same on both sides of the equation. Therefore the total or net ionic equation would be:

[tex]OH^-(aq)+H^+(aq)\rightarrow H_2O(l)[/tex]

Best regards!

Answer:

Meteoroids

Explanation:

Meteoroids are the elements of the universe that have the smallest diameter among all elements, reaching less than 1 km in diameter. They are any rocky or metallic body, which exists in space and does not reach more than 100 meters. It is common for meteoroids to fall to earth, but their impact is not as destructive as the impact of other space bodies, due to their tiny size.

Answer:

Explanation:

Intermolecular forces are the forces of attraction or repulsion which act between neighboring particles (atoms, molecules, or ions ). These forces are weak compared to the intramolecular forces, such as the covalent or ionic bonds between atoms in a molecule

Answer:

Intermolecular forces are the forces which mediate interaction between molecules, including forces of attraction or repulsion which act between atoms and other types of neighboring particles, e.g. atoms or ions.

Explanation:

Hope this helped Mark BRAINLIEST!!!

Answer:llllIIII

Explanation:

Answer:

F = m x a

F = 2400 kg x 3.6 m/s2

F = 8,640 N

Explanation:

Answer:

[tex]HCO^-_3+HBrO\rightleftharpoons H_2CO_3+BrO^-[/tex]

Explanation:

Hello there!

In this case, according to the Brønsted-Lowry theory of acids, it is possible to realize that HBrO acts as the Brønsted-Lowry acid as it has a free hydrogen to give away to HCO₃⁻ which acts as the Brønsted-Lowry base able to accept the incoming hydrogen; therefore, the Brønsted-Lowry reaction is:

[tex]HCO^-_3+HBrO\rightleftharpoons H_2CO_3+BrO^-[/tex]

Best regards!

In the Brønsted-Lowry reaction between HCO⁻₃ and HBrO, the formed acid is H₂CO₃ and the formed base is BrO⁻.

According to Brønsted-Lowry acid-base theory:

Let's consider the following Brønsted-Lowry reaction.

HCO⁻₃ + HBrO ⇄ acid + base

The resulting reaction is:

HCO⁻₃ + HBrO ⇄ H₂CO₃ + BrO⁻

In the Brønsted-Lowry reaction between HCO⁻₃ and HBrO, the formed acid is H₂CO₃ and the formed base is BrO⁻.

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Answer:

Phenolphthalein is often used as an indicator in acid–base titrations. For this application, it turns colorless in acidic solutions and pink in basic solutions. ... It is a weak acid, which can lose H+ ions in solution.

Chemical formula: C20H14O4

GHS precautionary statements: P201, P281

Explanation:

*internet*

Answer:

I think it's 10 electrons

Answer:

10 electrons I believe

Explanation:

5 atomic orbitals in 5d sublevel x 2 electrons/orbital = 10 electrons can reside in the 3d sublevel.

Answer:

[tex]T_{f,sol}=-15.0\°C[/tex]

Explanation:

Hello there!

In this case, for these problem about the colligative property of freezing point depression, it is possible set up the following equation:

[tex]T_{f,sol}-T_{f,water}=-i*m*Kf[/tex]

Whereas the van't Hoff's factor, i, is 2 since KCl is ionized in two ions (K+ and Cl-); and the molality (m) of the solution is computed by:

[tex]m=\frac{75g*\frac{1mol}{74.55g} }{250g*\frac{1kg}{1000g} } \\\\m=4.02mol/kg[/tex]

Thus, since the freezing point of water (ice) is 0°C, we obtain the following freezing point of the solution by plugging in:

[tex]T_{f,sol}=-(2)(4.02mol/kg)(1.86\°C/mol*kg)\\\\T_{f,sol}=-15.0\°C[/tex]

Best regards!

Answer:

B. Oxytocin

I think this is correct answer...

Answer:

NaOH

Explanation:

NaOH is called base because it dissociates completely in aqueous solution to form hydroxide ion(OH-) and sodium cation (Na+). When it react with an acid , it produce sodium salt and water. It is a strong base because it dissociates completely.

Answer:

a

Explanation:

it can not break that easily

The mineral has given square chunks when  breaked with a hammer. This indicates that the mineral has a cleavage. Thus, option c is correct.

Minerals are naturally formed inorganic substances which are having a definite chemical composition and highly ordered crystalline structures.  Minerals are deposited in many organic and inorganic matters.

Minerals have some peculiarities such as hardness, cleavage, color etc. Cleavage of a mineral is its tendency to break along crystallographic planes thereby the structural locations of ions and atoms in the crystal creates planes of relative weakness.

Cleavage of crystal results in pieces of square, cubic or other geometrical shapes. in The mineral here, broken into square pieces indicating that the mineral have some weaker crystallographic planes in comparison to other and they cleave.  Thus, c is correct.

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Answer:

Option E

Deuterium has one more neutron than hydrogen

Explanation:

Deuterium is an isotope of Hydrogen and hence there will variation in the number of neutron

Hydrogen has 0 neutron

Deuterium has 1 neutron and

Tritium has 2 neutron

Thus option E is correct

In the universe, there are approximately 26 deuterium atoms for every million hydrogen atoms. Deuterium has one more neutron than hydrogen.

The correct option is E.

Deuterium is a stable isotope of hydrogen, whose atomic weight is 2.014.

It is also called heavy hydrogen, and it contains one neutron and one proton.

In nuclear fusion reactors, deuterium is employed as a tracer, while in heavy water moderated fission reactors, it is utilized to slow down neutrons.

Thus, the correct option is E.

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Answer: Cu is limiting and 1.00 mole of excess S remain

Explanation:

The chemical balanced reaction is:

[tex]2Cu+S\rightarrow Cu_2S[/tex]  

According to stoichiometry :

2 moles of [tex]Cu[/tex] require 1 mole of [tex]S[/tex]

Thus 10.00 moles of [tex]Cu[/tex] will require=[tex]\frac{1}{2}\times 10.00=5.00moles[/tex]  of [tex]S[/tex]

Thus [tex]Cu[/tex] is the limiting reagent as it limits the formation of product and [tex]S[/tex] is the excess reagent.

Moles of S left = (6.00-5.00) moles = 1.00 mole

Thus Cu is limiting and 1.00 mole of excess S remain.

Answer:

This is a total of ten electrons in filled shells

Explanation:

Answer:

+1

Explanation:

Let's consider the following equation.

NaHCO₃ + HCl ⇒ NaCl + CO₂ + H₂O

To determine the oxidation number of Na in NaHCO₃ we will use the following rule: the sum of the oxidation number of the elements present in a compound is equal to this charge. For this compound we know:

Na + H + C + 3 O = 0

Na + (+1) + (+4) + 3 (-2) = 0

Na = +1

Answer:

Explanation:

It is Butanoic Acid

Answer:

percent ionization = 50.01%; pH = 4.75

Explanation:

To solve this question we must write the acetic acid equilibrium (Where HX will be acetic acid and X⁻ the sodium acetate):

HX(aq) ⇄ H⁺(aq) + X⁻(aq)

Where equilibrium constant, Ka, is defined as:

Ka = 1.76x10⁻⁵ = [H⁺] [X⁻] / [HX]

Where the concentration of each ion is:

[H⁺] = X

[X⁻] = 0.10M + X

[HX] = 0.10M - X

Replacing in Ka expression:

1.76x10⁻⁵ = [X] [0.10-X] / [0.10+X]

1.76x10⁻⁶ + 1.76x10⁻⁵X = 0.10X - X²

X² - 0.0999824 X + 1.76×10⁻⁶ = 0

X ≈ 0.1M → False solution. Decreases a lot the concentration of HX

X = 0.0000176M → Right solution.

The concentration of each ion is:

[H⁺] = 0.0000176062M

[X⁻] = 0.10M + 0.0000176M = 0.1000176M

[HX] = 0.10M - 0.0000176M = 0.0999824M

Percent ionization:

[X-] / [X-] + [HX] * 100 =

0.1000176M / 0.2M =

And pH = -log [H+]

As you can see, [H+]≈ Ka

Answer:

23.78 Grams of Aluminum Hydroxide

Explanation:

The table show the amount of reactants and products. The approximate amount of the leftover reactant is 23.78 g of aluminum hydroxide.

Aluminum hydroxide is present in nature as a gibbet. It has many side effects on humans, like nausea, vomiting, etc.

The reaction is [tex]\rm 2Al(OH)_3 + 3H_2SO_4 → Al_2(SO_4)_3 + 6H_2O[/tex]

Thus, the correct option is D, 23.78 g of aluminum hydroxide.

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The amount of atoms one million carbon atoms or so make up an average human hair.

The smallest unit of matter that may be divided without ejecting electrically charged particles is called an atom. It is also the smallest material with properties resembling chemical elements. As a result, the atom serves as the fundamental unit of chemistry. In a chemical reaction, atoms cannot be formed or destroyed since they are indivisible units.

One inch has 25,400,000 nanometers. The width of a human hair ranges between 80,000 and 100,000 nanometers. The thickest human hair is a million times smaller than an atom. An atom's diameter spans from 0.1 to 0.5 nanometers. The volume of the cells is typically 0.009 cubic microns. More than 150,000 of these germs could fit on the tip of a human hair, and about 150 of them could fit within one Escherichia coli cell.

Thus, the amount of atoms one million carbon atoms or so make up an average human hair.

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Answer:

0.1056 mole

Explanation:

As Sally knows that the charge on the metal ion is n = +2

[tex]$MCl_n=MCl_2$[/tex]

In that compartment [tex]$[M^{n+}]=[m^{2+}]=8.279 \ M$[/tex]

The volume of the [tex]$MCl_n$[/tex] taken in that compartment = 6.380 mL

So, the number of moles of [tex]$M^{2+} = 8.279 \times 6.380$[/tex]

                                                      = 52.82 m mol

                                                      = 0.05280 mol

[tex]$MCl_n \rightarrow M^{n+}+nCl^-$[/tex]

But n = 2

Therefore, moles of [tex]$Cl^-$[/tex] = 2 x moles of [tex]$M^{n+}$[/tex]

                                       = 2 x 0.05282

                                       = 0.1056 mole

The molarity of the solution will be:

B. 1.5 M, this can be calculated on adding the values of V and n in molarity formula.

It is defined as the ratio of number of moles of solute by the Volume of the solution in liters.

It is given by:

Molarity =  n/ V

What information do we have?

Volume = 5L

Moles of NaOH = 7.5 moles

On substituting the values

M= n/V

M= 7.5 moles / 5L

M= 1.5 M

Thus, the molarity of the solution is 1.5 M.

Hence, option B is correct.

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Answer:

a. Values are - (1) 3,1,-1,1/2        (2) 2,1,-1,-1/2       (3) 3,0,0,1/2    (4) 4,3,3,-1/2

(5) 3,2,2,1/2

b. Order be- I > Sn > Xe

Explanation:

a.

Valid quantum numbers are -

'l' value should be less than 'n' value and 'ml' value should be '-l' to 'l'

'ml' value should not more than 'l' or 'n'.

Values are -

3,1,-1,1/2

2,1,-1,-1/2

3,0,0,1/2

4,3,3,-1/2

3,2,2,1/2

b.

Given that-

I [Kr]4d¹⁰5s²5p⁵

Sn [Kr]4d¹⁰5s²5p²

Xe [Kr]4d¹⁰5s²5p⁶

Order be-

I > Sn > Xe

Xe is least because it is completely filled outer shell (5s²5p⁶