what indicates the follwing percentage of the natural occurance of an isotope ofc an element

The reaction given below shows a balanced incomplete combustion reaction:

B. 2 C₅H₁₂ + 11 O₂--> 10 CO + 12 H₂O

A combustion reaction is a reaction that involves substances reacting exothermically with oxygen to release large amounts of heat and light energy.

Hydrocarbons are compounds that contain only hydrogen and carbon.

Hydrogen combusts completely in oxygen to produce carbon(iv) oxide and water.

However, the incomplete combustion of hydrocarbons produces carbon (ii) oxide and water instead carbon(iv) oxide and water.

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The volume of 42 gallons in liters is 158.99 liters.

What is a bathtub?

It is a big and open container that is normally filled with water and used to bathe the body.

What is liter?

This is a  unit used in measuring volume. It is not a standard unit of measurement. A liter is equivalent in volume to a millistere. the symbol is ( L).

1 gallon = 3.7854 liters

Therefore 42 gallons  in liters will be:

42 *3.7854= 158.99 liters

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A 10-kg bag of goods on a shelf one meter above the ground has a gravitational potential of GPE= (10 kg)(9.8 m/s2) (1 m) GPE= 98

GRAVITATIONAL POTENTIAL: the energy possessed or acquired by an object due to a change in its position when it is present in a gravitational field. In simple terms, it can be said that gravitational potential energy is an energy that is related to gravitational force or to gravity

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Answer:

18g

Explanation:

1g H + 8g O = 9g H2O since H is limiting factor

One kilopascal of pressure is 0.01 bar pressure. Thus 494 kilopascal pressure is 4.94 bar pressure.

Pressure is an intensive quantity measuring the force produced on body by a mechanical stress. Pressure of a substances is inversely proportional to the volume and directly proportional to the temperature.

Pressure of a substance can be expressed in different units where, the SI unit is atm or atmospheric pressure. Other units are bar, pascal, kilopascal etc.

One kilopascal pressure = 0.01 bar. Hence, 494 kilopascal is:

(494 Kpa × 0.01 bar) / 1 kpa = 4.94 bar.

Hence, 494 Kpa pressure is 4.94 bar.

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The DNA parts are identified as:

Genetic codes are nucleotide sequences in deoxyribonucleic acids (DNA) and ribonucleic acids (RNA) that determines the order of an amino acid which is the building block of proteins. It is a set of rules for translating information encoded genetic materials by living cells.

The part labelled A are called Nitrogen bases containing adenine and thymine, T pair, cytosine, C and guanine, G pair that are bound to form DNA while the Sugar phosphate backbone forms the structural base of the DNA and RNA.

The complete question is:

Use the drop-down menus to identify the parts of DNA.

Label A

Label B

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Answer: Label A is nitrogen bases

Label B is sugar phosphate backbone

The partial pressure of nitrogen gas in 2L sample of gas 1 and gas 2 are equal.

The overall pressure exerted by a mixture of gases is equal to the sum of the partial pressures exerted by each individual gas in the mixture, according to Dalton's law of partial pressures, a gas law.

P'=X° ×Pt ( P' = partial pressure , Xi = mole fraction , Pt= Total pressure )

Gas 1  ( ∵1 mole of gas = 22.4L)

Nitrogen moles = 80% × 2L / 22.4L

=8/5x22.4L

Oxygen moles = 20% ×2L /22.4L

2/5 × 22.4l

Mole fraction of nitrogen =  (8/5 ×22.4L) ÷ (8/5 ×22.4L+ 2/5x22.4L)

=4/5

Partial pressure of nitrogen at 1 atm = 4/5 * 1

=4/5

Similarly Gas 2

Nitrogen moles = 80% × 2L / 22.4L

=16/10 × 22.4L

Oxygen moles = 15%  × 2L /22.4L

3/10 × 22.4l

Carbon dioxide moles = 5% × 2L /22.4L

1/10 × 22.4L

Mole fraction of nitrogen =  (16/10 × 22.4L) ÷ (16/10 ×22.4L+ 3/10x22.4l + 1/10X22.4L) = 4/5

Partial pressure of nitrogen at 1 atm = 4/5 * 1

=4/5

Hence, partial pressure of nitrogen in gas 1 and gas 2 are equal.

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The number of common amino acids that are formed and used by living organisms is twenty (20), and nine are essential for living.

Amino acids are the building blocks of proteins that are linked by peptide bonds to form biomolecules. Proteins may be composed of 20 different types of amino acids, which include 9 essential amino acids that the human cannot synthesize and must be consumed from the diet.

Amino acids include, for example, leucine, isoleucine, tryptophan, tyrosine, etc. All these molecules contain an amino group and also a carboxylic group that gives them the name of amino acids.

Therefore, with this data, we can see that amino acids are composed of an amine group and a carboxylic group and they are 20 of which nine (9) are essential because the human body cannot synthesize them and must be obtained from the foods.

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The total pressure of the system is 0.32 atm an the mole fraction argon  of the carbon dioxide is 0.75.

We know that where we have a mixture of gases, each of the gases would exert pressure on the walls of the container. The pressure that is exerted on the walls of the container is what we call the pressure of the gas.

We have;

Pressure of carbon dioxide = 0.080 atm

Pressure of argon = 0.24 atm

Total pressure of the system =  0.080 atm + 0.24 atm = 0.32 atm

Partial pressure = mole fraction * total pressure

Let the mole fraction be X

0.24 = X *  0.32 atm

X = 0.24 atm/0.32 atm

X =0.75

If I am to draw the number of particles, I would draw one particle for carbon dioxide and three particles for argon based on the value of the mole fraction of the system.

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The intermolecular forces between the oxygen molecules are very weak because of which a very less amount of energy is required for the oxygen to evaporate into a gas. There is no H-bonding or dipole movement present in oxygen molecules because of which the forces binding the molecules are absent in oxygen.

hence your correct option should be D

Answer:

Calcium Hydroxide is more soluble in water

Explanation:

Calcium Hydroxide is more soluble in water as all group 2 carbonates are not very soluble while Group 2 hydroxides are moderately soluble.

The internal energy of a human body is the net energy contained in the body due motion of its particle or molecules.

In a human body the internal energy is stored . It increases when the temperature of the body rises, or when the body observes some changes. Internal energy we can say that is the sum of kinetic and potential energy of all particles in the body.

Internal energy is a state function of a system and is an extensive quantity. Every substance possesses a fixed quantity of energy which depends upon  its chemical nature and also on its state of existence. Every substance have a definite value of Internal energy.

The change in the Internal energy of a reaction may be considered as the difference between the internal energies of the two states.

ΔU = [tex]E_{B}[/tex] - [tex]E_{A}[/tex]     where [tex]E_{B}[/tex] and [tex]E_{A}[/tex] are the initial energies of states A and B. Or we can also write the equation as:

ΔU = ΔE

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Answer:

B.) 10.9 g

Explanation:

To find the mass of Mg(NO₃)₂, you need to (1) convert the volume from mL to L, then (2) calculate the amount of moles (using the molarity equation), and then (3) convert moles to grams (using the molar mass). It is important to arrange the conversions/ratios in a way that allows for the cancellation of units.

(Step 1)

1,000 mL = 1 L

 183 mL                1 L
--------------  x  -----------------  =  0.183 L
                        1,000 mL

(Step 2)

Molarity = moles / volume (L)                   <----- Molarity equation

0.400 M = moles / 0.183 L                        <----- Insert variables

0.0732 = moles                                        <----- Multiply both sides by 0.183

(Step 3)

Atomic Mass (Mg): 24.305 g/mol

Atomic Mass (N): 14.007 g/mol

Atomic Mass (O): 15.999 g/mol

Molar Mass (Mg(NO₃)₂): 24.305 g/mol + 2(14.007 g/mol) + 6(15.999 g/mol)

Molar Mass (Mg(NO₃)₂): 148.313 g/mol

 0.0732 moles Mg(NO₃)₂             148.313 g
---------------------------------------  x  ---------------------  =  10.9 g Mg(NO₃)₂
                                                         1 mole

Answer:

Qns no.3: it is not a correct answer

Explanation:

S has 6 outermost electrons and O has 6 outermost electrons, during bonding inorder to be stable their shouldn't be any unpaired electron in a structure. so 2 double bonds will be formed.

The simplest form of calcium carbonate is CaCO3.

What is the use of Calcium carbonate?

Calcium carbonate can be used as a dietary supplement when the amount of calcium in a person's body is less. Calcium is used even as an antacid. Calcium is necessary by the body for bones, heart and muscles.

In this, we are not provided the direct masses, so we will use this percentage composition.

The number of moles of each element are:

Ca-40/40= 1

C- 20/12 = (1.6 considered to be 1)

O- 48/16 = 3

Now all the three will be divided with the lowest value and that is 1, so the ratio of Ca: C: O= 1:1:3

Therefore, the simplest formula is CaCO3.

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The ground state ion that has unpaired electrons is Sc²⁺ ion; option C is correct.

The ground state ion is the state in which all its electrons are in the lowest energy orbitals possible. You can get positive ions by removing electrons until you reach a noble gas configuration.

Ground state ion configurations are the foundation for understanding molecular bonding, properties, and structures. From the electrons in an atom to the differing orbitals and hybridization, the ground state ion configuration throws light on many different atomic properties.

For example, the electronic configuration of Sc²⁺ is 1s²2s²2p⁶3s²3p⁶ 3d¹ 4s.

In conclusion, understanding electronic configuration leads to an understanding of the periodic table.

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Atom consists of electron, proton and neutron.  The number of proton and electrons is 25. The number of neutron is 30. The given element is manganese, Mn.

Atom is the smallest particle of any matter. Atom combines to form element and element combine to form molecule or compound.

Mass number =Number of neutrons+ number of protons

Mass number =55

Number of neutrons=atomic number+5

Substituting the given values in the above formula

55 =atomic number+5+ number of protons

50=2×atomic number

Atomic number=25

Therefore, the number of proton and electrons is 25. The number of neutron is 30. The given element is manganese, Mn.

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Hello!

Answer:

True :P

The frequency of the color of red light that has a wavelength of 663nm is 4.52 × 10¹⁴Hz.

Frequency of a wave is the quotient of the number of times (n) a periodic phenomenon occurs over the time (t) in which it occurs.

Wavelength is the length of a single cycle of a wave, as measured by the distance between one peak or trough of a wave and the next.

Wavelength is often designated in physics as λ, and corresponds to the velocity of the wave divided by its frequency.

According to this question, the wavelength of a particular color of red light is 663nm. The frequency can be calculated as follows:

663 × 10-⁹ = 3 × 10⁸ ÷ f

f = 3 × 10⁸ ÷ 6.63 × 10-⁷

f = 4.52 × 10¹⁴Hz

Therefore, 4.52 × 10¹⁴Hz is the frequency of the color of the red light.

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300 grams of sodium iodide, Nal, must be used to produce 90.2 g of iodine, I₂

Sodium iodide is the ionic compound formed from the chemical reaction of sodium metal and iodine

Here given data is

I₂ has the molar mass = 253.8g/mol

So how many moles of I₂ we want to produce = 90.2 g I₂ ×1mol I₂ /253.8g/mol = 0.35 mole of I₂

Then the conversion of NaI to I₂ are

2 NaI → 2Na + I₂

0.35 mole of I₂ × 2 mole of NaI/mole of I₂ = 2 mole of NaI are needed

covert this value into gram

2 mole of NaI ×150. g NaI / mole NaI = 300 gram NaI would be needed

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The figures illustrate the law of multiple proportions because the empirical formulas of the two oxides are CO and [tex]CO_2[/tex] respectively.

The law of multiple proportions states that when two elements combine with each other to form more than one chemical compound, the weights of one element that combine with a fixed weight of the other are usually in small whole-number ratios.

The figures mentioned in the problems can be tested for agreement with the law of multiple proportions by finding the empirical formulas of the two oxides formed against a fixed weight of carbon:

The analysis of the first oxide is as follows:

C = 42.9

O = 100-42.9

   = 57.1

The equivalent mole of each atom will then be calculated by dividing each atom by their respective molar weights:

C = 12 g/mol

O = 16 g/mol

C = 42.9/12

  = 3.56

O = 57.1/16

   = 3.56

Thus, the empirical formula of the first oxide is CO.

The second oxide:

C = 27.3

O = 100 - 27.3

   = 72.7

The equivalent mole of each atom will be:

C = 27.3/12

  = 2.27

O = 72.7/16

   = 4.54

Dividing the moles by the smallest mole

C = 2.27/2.27

  = 1

O = 4.54/2.27

   = 2

Thus, the empirical formula of the second oxide is [tex]CO_2[/tex].

The first oxide gives CO while the second oxide gives  [tex]CO_2[/tex]. The weight of oxygen that combines with the fixed weight of carbon can be seen to be in simple whole-number ratios (1 and 2).

In other words, the figures quoted obeys the law of multiple proportions.

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Explanation:

E =hv

= h*3*10power8meterpersecond ÷6.22*10power of -7m

where h is planks constant

Energy of light emitted is 4117.64 * 10 ⁻²⁵. E= hv.

An electron's energy is determined by where it is in relation to the atom's nucleus. The distance an electron in an atom has to travel from the nucleus depends on its energy level.

The mass of an electron is roughly 1/1836 that of a proton. The intrinsic angular momentum (spin) of the electron is given in units of the decreased Planck constant and has a half-integer value.

Energy has a negative sign, meaning that an electron is drawn to the nucleus. The electron has the least energy in the first orbit, and as n grows, or as it gets less negative, the electron's energy increases.

Therefore, Energy of light emitted is 4117.64 * 10 ⁻²⁵. E= hv.

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Explanation:

[tex]density \: = \: mass \: over \: volume \\density \: 16grams \: over \: 7cm {}^{3} \\ density = 2.3g \cm {}^{3} [/tex]

The box for the following fusion equation 2 H + 2 H —> (2H₂) + energy

An critical fusion reaction for practical electricity generation is that between deuterium and tritium (the D-T fusion reaction). It produces helium (He) and a neutron (n) and is written D + T → He + n. To the left of the arrow (earlier than the response) there are  protons and 3 neutrons. The same is genuine on the proper.

Fusion guarantees a without a doubt endless shape of power that, in contrast to fossil fuels, emits 0 greenhouse gases and, not like the nuclear fission electricity used today, produces no lengthy-lifestyles radioactive waste.three.

Calculation:-

2 H + 2 H —> (2H₂) + energy

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The elements give off specific color because the energy of shells of different elements are specific.

Electrons when excited jump from a lower energy level to higher energy level. in higher energy level the electron are less stable . so, after some time they return from higher to lower energy level an emit some light of different wavelength of specific colors. The difference in the energy of the shells of the atom are specific. the color of different elements are different because of the light emitted and the wavelength is inversely proportional to energy.

E = hc / λ

Thus, The elements give off specific color because the energy of shells of different elements are specific.

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The empirical formula for this compound is CH₂Cl₂.

C = 14.14% / 12 = 1.17

H = 2.38% / 1 = 2.38

Cl = 83.48% / 35.5 = 2.35

Now, divide by 1.17

C = 1.17 / 1.17 = 1

H = 2.38 / 1.17 = 2

Cl = 2.35 / 1.17 = 2

Therefore, The empirical formula for this compound is CH₂Cl₂.

In chemistry, the  empirical formula of a chemical compound is the best entire variety ratio of atoms found in a compound.

There are three main types of chemical formulas: empirical, molecular and structural. Empirical formulas display the best whole-range ratio of atoms in a compound, molecular formulas show the quantity of every kind of atom in a molecule, and structural formulas display how the atoms in a molecule are bonded to every different.

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Yes, this replacement reaction 3Ca + Au₂S₃ → 3CaS + 2Au.

A replacement reaction occurs when elements switch places in compounds. This type of reaction involves ions.

Generally, more reactive elements replace less reactive elements. A single replacement reaction occurs when one element replaces another element in one compound.

A single replacement reaction, sometimes called a single displacement reaction, is a reaction in which one element is substituted for another element in a compound. The starting materials are always pure elements, such as a pure zinc metal or hydrogen gas, plus an aqueous compound.

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The empirical formulae of the compounds which contain: 5.85 g K, 2.10 g N , 4.80 g O is KNO₂.

given that :

mass of potassium , K = 5.85 g

molar mass of potassium = 39 g/mol

mass of nitrogen , N = 2.10 g

molar mass of nitrogen = 14

mass of oxygen , O = 4.80 g

molar mass of oxygen = 16

now, we have calculate the number of mole for each atom :

number of moles of potassium , K = mass / molar mass

                                                         = 5.85 / 39

                                                         = 0.15 mol

number of moles of nitrogen , N = 2.10 / 14

                                                      = 0.15 mol

number of moles of oxygen , O = 4.80 / 16

                                                     = 0.3 mol

now, dividing by the smallest one , we get

moles of K = 0.15 / 0.15 = 1

moles of N = 0.15 / 0.15 = 1

moles of O = 0.3 / 0.15 = 2

The empirical formula = KNO₂

Thus, The empirical formula of the compounds which contain: 5.85 g K, 2.10 g N , 4.80 g O is KNO₂.

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