A coin collector has a bag of 50 pennies. What is the percent abundance of the post-1982 pennies? ASAP ANSWER PLS.

Percent ionization = 3.17%

We utilize the supplied acid equilibrium constant (Ka) to calculate the percentage of the acid that is ionized. It is the ratio of the acid and dissociated ion equilibrium concentrations. The HF acid would dissociate in the manner described below:

HF = H+ + F-

The following is how the acid equilibrium constant might be written:

Ka = [H+][F-] / [HF] = 3.5 x 10-4

We utilize the ICE table to determine the equilibrium concentrations.

        HF             H+              F-

I      0.337           0                 0

C      -x              +x               +x

---------------------------------------------

E    0.337-x        x                   x

3.5 x 10-4 = [H+][F-] / [HF]

3.5 x 10-4 = [x][x] / [0.337-x]

Solving for x,

x = 0.01069 = [H+] = [F-]

percent ionization = 0.01069 / 0.337 x 100  = 3.17%

percent ionization = 3.17%

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Answer:

1363.2 kilocalories

Explanation:

Heat up the ice ==> melt the ice to water ==> heat the water ==> vaporize the water to steam ==> heat the stem 52 degrees to 152

1.81 kg * (spec heat of ice * 19  +* heat of fusion of water + specific heat of water *100 +  heat of vaporization of water + specific heat of steam* 52)

1810 g  * ( .50 cal/g -C * 19 C    +  79.7 cal / g   +  1 cal/g-C  *100C   +  539 cal/g + .48 cal/g * 52 C ) = 1 363 219.6 calories

(check my math)

When an atom of the element lithium (Li) transfers an electron to an atom of the element fluorine (F), then the bond results between the atoms is ionic bond.

A chemical bond is defined as the bond which holds atoms together in molecules.

Bonds arise due to the electrostatic forces present between positively charged atomic nuclei and negatively charged electrons.

Ionic bond is defined as the transfer of electron from one atom to another atom.

Since, electron transfer from lithium to fluroine. Thus lithium get positive charge and fluorine occupy negative charge.

Thus, the bond form between lithium atom and fluorine atom is ionic bond.

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Answer:

2-methylpropanoic acid

Explanation:

no probs chief

Four different substituents are required on a carbon atom for it to be chiral.

The carbon atom which is attached with four different types of group of atoms or atoms is called Chiral carbon. Chiral molecules are non superimposable on their mirror images. Chiral carbon is also called asymmetric carbon.

Example:

[tex]Br - \underset{H} {\underset{|} {\overset{CH_3} {\overset{|}{C}}}} - Cl[/tex]

In the above example we can see that carbon atom has 4 different group attached with it that is Br, Cl, H, CH₃.

Thus from the above conclusion we can say that Four different substituents are required on a carbon atom for it to be chiral.

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Answer:

A.) Brønsted-Lowry bases

Explanation:

Amines have a lone pair of electrons.

Brønsted-Lowry bases donate a lone pair of electrons in exchange for a hydrogen ion.

Therefore, if exposed to an acid, amines will give up electrons in order to bond with a hydrogen. This makes them Brønsted-Lowry bases.

cesium chloride is another chloride that could be used instead of the calcium chloride dihydrate to produce a solid precipitate with aqueous sodium carbonate

A mineral salt called cesium chloride (CsCl) is occasionally ingested or administered intravenously to cancer patients seeking alternative therapies. However, the FDA has not yet approved any cesium chloride products to treat cancer or other disorders.

In isopycnic centrifugation, cesium chloride is a common medical compound used to separate different forms of DNA. It is a reagent used in analytical chemistry to distinguish ions based on the hue and shape of the precipitate.

Cesium chloride is not proven to be effective in treating cancer. As an alternative to chemotherapy for cancer, cesium chloride is pushed. Supporters assert that cesium prevents tumor cells from proliferating by neutralizing the poisons they release.

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The chemical equation of photosynthesis includes 6[tex]O_{2}[/tex]. -----a gas produced during photosynthesis best describes this substance

Elaborate:

During photosynthesis plants use carbon dioxide, water and sunlight to make sugar (glucose) and a waste product, oxygen gas.

the equation of this process can be:

6 [tex]CO_{2}[/tex] + 6 [tex]H_{2} O[/tex] + light energy  →  [tex]C_{6} H_{12} O_{6}[/tex] + 6 [tex]O_{2}[/tex]

carbon dioxide + water + light  →   glucose + oxygen

Is 6[tex]O_{2}[/tex] a product of photosynthesis?

In photosynthesis, energy from light is used to convert carbon dioxide and water into glucose and oxygen. For 6 carbon dioxide and 6 water molecules, 1 glucose molecule and 6 oxygen molecules are produced.

What happens to sugar water oxygen and carbon dioxide during photosynthesis?

During photosynthesis, plants take in carbon dioxide  and water  from the air and soil. Within the plant cell, the water is oxidized, meaning it loses electrons, while the carbon dioxide is reduced, meaning it gains electrons. This transforms the water into oxygen and the carbon dioxide into glucose.

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What's the effect of surface area change

We know

Pressure is indirectly proportional to area

Semiconductors show the property of both the conductor and insulator. They are more effective than metals as their valence electron can free flow by the sun's energy. Thus, option B is correct.

Semiconductors are substances and materials that exhibit intermediate properties of conductors and insulators. They are solid materials that can conduct electrical charges due to the added impurity or change in temperature.

They have a valence electron in their outer shell that can absorb the energy from the sun to get excited. This leads to the flow of the charge in the semiconducting substance more easily.

Therefore, option B. the semiconductors can absorb the extra energy is correct.

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Your question is incomplete, but most probably your full question was, Semiconductors are more effective than metals as converters of solar radiation into electricity because

A. it is easier for the atoms of a semiconductor to absorb solar energy and to move from place to place within the solid, thereby conducting electricity.

B. the energy contained in sunlight gives the valence electrons in the semiconductor atoms the extra energy they need to "flow" throughout the solid.

C. metals melt much too easily under direct sunlight and, as liquids, lose their ability to conduct electricity.

D. solar radiation has sufficient energy to knock electrons completely off the metal surface, making it impossible for the electrons to "flow" from atom to atom and conduct electricity.

When 25.0 g of Mg react with 25.0 g of O₂ it produce 41.9g of MgO.

Chemical reaction:

2Mg + O₂ → 2 MgO

Given,

Mass of Mg = 24g

Mass of O₂ = 25 g

Molar mass of O₂ = 16×2

= 32 g

Molar mass of Mg = 24.3

Moles of Mg  =25/24.3

=1.04mole

Moles of O₂  =25/32

=0.78mole

From above reaction we can say that 2moles of mg react with 1moles of O₂ to give 2moles of MgO.

So, 1 mole of Mg react with 0.5 mole of O₂ to produce 1mole of MgO.

So, 1.04 react with= 0.5× 1.04

= 0.520 g oxygen to give 1.04 moles of MgO.

From above we can say that Mg is limiting reagent.

Moles of MgO =1.04

Molar mass of MgO =40.3

Mole =given mass/ molar mass

1.04  =mass/ 40.3

Mass = 1.04×40.3

41.9 g

Thus, from above we concluded that 25.0 g of Mg react with 25.0 g of O₂  it produce 41.9g of MgO.

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The OH peaks in the IR spectra of benzyl alcohol and benzoic acid should be compared and contrasted.

The percent transmittance (or absorbance) of the radiation through the molecule against the radiation's wave number forms the IR spectrum.

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It is important to contrast and compare the OH peaks in the IR spectra of benzyl alcohol and benzoic acid.

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The equilibrium constant for the un-catalyzed reaction is 0.9

The enzyme triose phosphate isomerase catalyzes the reaction in the forward direction as part of the glycolytic pathway. It follows simple Michaelis-Menten kinetics.

Typical cellular concentrations:

triose phosphate isomerase = 0.1 nM

dihydroxyacetone phosphate = 5 µM

glyceraldehyde-3-phosphate = 2 µM

So, equillibrium constant is

K = [tex]\frac{[P]}{[S]}[/tex]

K = [tex]\frac{ glyceraldehyde-3-phosphate}{dihydroxyacetone phosphate}[/tex]

Therefore, The equilibrium constant for the un-catalyzed reaction is 0.9

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During action potential, positively charged  sodium ions move inside the cell.

So option D is correct one.

The sodium ion moves inside the cell during a action potential. The stage of action potential is called depolarization . This open voltage gated sodium channel.

Action potentials ( those electrical impulse that send signals around body )  is nothing but more than temporary shift ( from negative to positive ) in the neuron's membrane potential caused by ions suddenly flowing in and out of the neuron.

It consists of phases:

An active potential propagates along the cell membrane of an axon until  it reaches the terminal button.

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The molarity of the solution is 0.32 M

Calculation,

Molarity of the solution is the total number of moles present in volume in liter.

molarity = number of moles/volume in liter = n/V                  ...(i)

Number of moles of sulfuric acid = given mass/molar mass

Number of moles of sulfuric acid (n) = 16g/98.079g/mol = 0.16 mole

Volume of the solution (V) = 0.5 L

Putting the value of volume and number of moles in equation (i) we get,

molarity = 0.16 mol/0.5 L = 0.32 mol/L = 0.32 M

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Standard enthalpy change of neutralization is the enthalpy change when 1 mole of water is produced by the reaction of an acid and a base under standard conditions.

Enthalpy change of neutralization:

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The pH of the buffer made by combining Nitrous acid and Sodium Nitrite will be 3.06.

pH can be defined as the medium of expressing the acidity or alkalinity of any solution. It is the potential of hydrogen atoms.

Buffers are the solutions that resist any change in the pH when an acid or base is added to them.

According to the question,

0.150 M nitrous acid (HNO₂) = 45 ml

0.175 M sodium nitrate (NO₂⁻)= 20 ml

Kₐ of nitrous acid (HNO₂) = 4.5 × 10⁻⁴

Total volume of buffer = 45 ml + 20 ml = 65 ml

Concentration of HNO₂ = (45) (0.150) / 65 = 0.103 M

Concentration of NO₂⁻ = (20) (0.175) / 65 = 0.054 M

                     HNO₂  ⇒ H⁺ + NO₂⁻

Initial :          0.103        0     0.054

Change:         -x             +x       +x

Equilibrium: 0.103-x        x       0.054+x

Kₐ = x(0.054+x) / 0.103-x = 0.054x / 0.103 = 0.524x

Also, Kₐ = 4.5 × 10⁻⁴

Therefore, 4.5 × 10⁻⁴ = 0.524x

                              x = 8.58 × 10⁻⁴ M

H⁺ = x = 8.58 × 10⁻⁴ M = 8.6 × 10⁻⁴ M

Therefore, pH = -log ( 8.6 × 10⁻⁴ M)

                 pH = 3.06

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Water contributes to the fitness of the environment to support life by acting as a Solvent for molecules to interact Moderate Earth's climate.

Water contributes to the fitness of the environment to support life in several ways :

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4Na + O₂ → 2Na₂O is balanced equation.

Hence, Option (B) is correct answer.

The balanced chemical equation is the equation in which the number of atoms on the reactant side is equal to the number of atoms on the product side in an equation.

Now check all the options one by one:

Option (A): 2H₂ + O₂ → 4H₂O

Reactant Side               Product Side

H = 4                               H = 8

O = 2                               O = 4

Here number of atoms of H on the reactant side is 4 and number of atom on product side is 8. H atoms are not balanced in this equation. Hence the given equation is not balanced.

Option (B): 4Na + O₂ → 2Na₂O

Reactant Side               Product Side

Na = 4                            Na = 4

O = 2                              O = 2

Here all the atom on reactant side and product side are equal. Hence the given equation is balanced.

Option (C):  Fe₂O₃ + H₂ → 2Fe + 3H₂O

Reactant Side               Product Side

Fe = 2                              Fe = 2

O = 3                                O = 3

H = 2                                H = 6

Here number of atoms of H on the reactant side is 2 and number of atom on product side is 6. H atoms are not balanced in this equation. Hence the given equation is not balanced.

Option (D): CH₄ + O₂ → CO₂ + H₂O

Reactant Side               Product Side

C = 1                                C = 1

H = 4                               H = 2

O = 2                               O = 3

Here H atoms on the reactant and product side is not equal and O atoms are also not equal on the reactant side and product side. Hence, the given equation is not balanced.

Thus from the above conclusion we can say that The balanced equation from the given options is 4Na + O₂ → 2Na₂O

Hence, Option (B) is correct answer.

Disclaimer: The question was given incomplete on the portal. Here is the complete question.

Question: Which of the following equations is balanced?

(A) 2H₂ + O₂ → 4H₂O

(B) 4Na + O₂ → 2Na₂O

(C) Fe₂O₃ + H₂ → 2Fe + 3H₂O

(D) CH₄ + O₂ → CO₂ + H₂O

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Markovnikov addition product from the addition of hi to 2-methyl-2-butene is 2-iodo-2-mehtylbutane.

What is Markonikov rule?

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Answer:

pH of  4

Explanation:

Upon comparing a solution with a pH value of 4 and that having a pH of 7, you will realize that it has a pH difference of 3 although the concentration of ions of hydrogen having a pH of 7 is 1000 times greater than being at a pH of 4.

The volume occupied by 3.66 x [tex]10^{23}[/tex] atoms of lithium is 7.73 [tex]cm^3[/tex]

The density of a substance is defined as the mass of the substance per unit volume. It is often denoted by the symbol ρ

The density of a substance is given by,

[tex]\rho = \frac{m}{V}[/tex]

The mass of a substance is the measure of the amount of matter present in it. It is generally measured in grams (g) or kilograms (kg).

The volume of a substance is defined as the amount of 3D space occupied by it.

It is a concept which uses mole as a unit to measure the number of atoms, molecules or ions.

A mole is defined as the amount of substance which has the same number of elementary particles as there are atoms in 12 grams of [tex]\ce{^{12}C}[/tex]

1 mole = Avogadro's number = 6.022 x [tex]10^{23\\[/tex] atoms

Molar Mass of Lithium = 6.94 g/mol

1 mole of Lithium has 6.022 x [tex]10^{23}[/tex] atoms

3.66 x [tex]10^{23}[/tex] atoms of lithium has molar mass = [tex]\frac{6.94 g}{6.022\times10^{23} } \times 3.66 \times 10^{23}[/tex]

[tex]m = 4.218 g[/tex]

Substitute in density formula,

[tex]\rho = \frac{m}{V}[/tex]

[tex]V = \frac{m}{\rho}[/tex]

[tex]=\frac{4.218g}{0.546g/cm^3}[/tex]

= 7.73 [tex]cm^3\\[/tex]

Therefore, 3.66 x [tex]10^{23}[/tex] atoms of lithium occupies 7.73 [tex]cm^3\\[/tex] of volume.

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The acid dissociation constant (Ka) defines the difference between a weak and a strong acid. The % ionization of hypochlorous acid is 0.14%.

The acid dissociation constant is used to define the ionization constant of an acidic substance. It gives the quantitative measurement of the strength.

The ICE table is attached to the image below.

The acid dissociation constant (Ka) for the reaction is,

Ka = [H⁺][ClO⁻] ÷ [HClO]

= a² ÷ (0.015 - a)

= 3.0 x 10⁻⁸

Now, a² + 3.0 x 10⁻⁸ a - 4.5 × 10⁻¹⁰ = 0

So, a = 2.210 × 10⁻⁵

Solving further,

[H+] = a = 2.210 × 10⁻⁵ M

The percent ionization is calculated as,

[H+] ÷ [HClO] × 100

= 2.210 × 10⁻⁵ M ÷ 0.015 × 100

= 0.14 %

Therefore, 0.14 % is the percentage of hypochlorous ionization.

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Your question is incomplete, but most probably your full question was, The ka of hypochlorous acid (HClO) is 3.0 x 10⁻⁸ at 25.0°C. What is the % of ionization of hypochlorous acid in a 0.015 aqueous solution of HClO at 25.0C?

1. The first step is to convert your given masses into moles. This way, you can see which reactant is in excess and which one is limiting. A good flow of thought would be: kilograms of SiO2/Carbon→ grams SiO2/Carbon→moles SiO2/Carbon.

2. Repeat this step for the carbon reactant.

3. By comparison, we can tell that the carbon reactant is in excess, which means that the SiO2 reactant is limiting. Because of this, we’ll use the amount of SiO2 to find our percent yield. There’s only so much SiO2 that can react with the carbon.

4. You can now calculate the actual and theoretical yields. The theoretical yield is larger than the actual yield because it does not have physical interactions like loss of energy to the environment and friction to interfere with the reaction.

5. Now compare your two values of actual and theoretical. The formula for percent mass is [(Actual yield)/(Theoretical yield)]*100%. Our final answer for this question is the percent yield of the reaction is 90.8% We can interpret this as 90.8% of the SiO2 reacting will produce solid silicon.

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The boiling point of water would increase by 1°C if 1 mol of NaCl added 1 kg of water.

The addition of solute substances to solvent such as water results in a change in the boiling points and freezing points of the solvents.

The formula to calculate the change in temperature is given below:

ΔT = Kbmi

Where;

m is molality of the solution

Kb and i are constants.

Solving for change in temperature:

m = 1 mol/kg

ΔT = 0.51 * 1 * 2

ΔT = 1°C

The normal boiling point of water is 100°C

The new boiling point of the solution = (100 + 1) = 101 °C

In conclusion, addition of solute to solvent will result in change in the boiling point of the solvent.

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The Rutherford experiment was used to prove the existence of a positively charged nucleus containing the protons.

The Rutherford experiment was used to prove the existence of a positively charged nucleus..

Alpha particles passed mostly undeflected through a aluminum foil.

The part of the foil where the alpha particles were deflected  was the positively charged nucleus where most of the mass of the atom was concentrated.

In conclusion, the Rutherford experiment proved the existence of a positively charged nucleus.

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Answer: electrostatic attraction

Explanation: ionic bond, also called electrovalent bond, type of linkage formed from the electrostatic attraction between oppositely charged ions in a chemical compound.

The answer is 100 Pa.

The formula for calculating pressure is :

Pressure = Force ÷ Area

We are given that :

We also know that :

Force = mass ×g

So, force will be :

Now, we can finally calculate pressure :

Pt195 having 78 atomic number is the daughter nucleus produced when Au195 undergoes electron capture.

An unstable isotopes can undergoes radioactive decay to form a more stable isotopes . Initial isotopes is called parent nuclide and the resultant isotopes from radioactive decay is called the daughter nuclide There are several radioactive decay like alpha decay , beta decay  , gamma decay , electron capture etc .

In electron capture , the atom have only one less which is daughter isotopes than electron than atomic number of parent isotopes.

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Answer:

mass = 107.04 g

Explanation:

The formula for mass is:
[tex]\boxed{mass = mole \space\ no. \times \space\ molar \space\ mass}[/tex].

In this case:

• molar mass = 32.06 g/mol

• mole no. = [tex]\frac{no. \space\ of \space\ atoms}{Avogadro's \space\ number}[/tex]

               = [tex]\frac{2.01 \times 10^{24}}{6.02 \times 10^{23}}[/tex]

               = 3.339 mol

Substituting these values into the formula for mass :

mass = 3.339 mol × 32.06 g/mol

         = 107.04 g

The answer is 107.04 g.

The first step is to find the number of moles of sulfur.

Number of moles = No. of atoms ÷ Avogadro No.

Now, to find the mass, multiply the number of atoms by the molar mass.