A coin collector has a bag of 50 pennies. What is weighted average of a penny in the sample according to the data?

The mass (g) of the original sample after decomposition is 8.3983 g.

A decomposition reaction can be described as a chemical reaction wherein one reactant breaks down into or extra merchandise.

explanation:

Reaction          2KClO₃ ⇒ 2KCl + 3O₂

moles               2               2            3

molar mass    122.55        74.55    32

Given, Mass of O₂ = 3.29g ⇒ moles of O₂

                                            =  (3.29/32) = 0.1028

3 moles of O₂  produced by 2 moles of KClO₃

Therefore, 0.1028 moles of O₂  produced by (2*0.1028/3) = 0.06853 moles of Kclo₃

Mass of KClo₃ in original sample is = moles * molar mass

                                                        = 0.06853 * 122.55

                                                       = 8.3983 g

A decomposition response occurs whilst one reactant breaks down into or extra merchandise. this may be represented through the general equation: XY → X+ Y. Examples of decomposition reactions consist of the breakdown of hydrogen peroxide to water and oxygen, and the breakdown of water to hydrogen and oxygen.

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When 20. 0 g NH₃ and 50. 0 g O₂ are allowed to react, NH₃ is the limiting reagent.

Limiting reagent is defined as that reactant in a chemical reaction which is completely consumed in reaction.

Given,

Mass of NH₃ = 20 g

Mass of O₂ = 50 g

Molecular mass of NH₃ = 14 + 7 = 17 g

Molecular mass of O₂ = 2 × 16 = 32 g

Mole = given mass/ molecular mass

Mole of ammonia = 20/17

                             = 1.17 mole

Moles of O2 = 50/32

                    = 1.56 mole

Chemical equation:

4NH₃(g) + 3O₂(g)  ⟶ 2N₂(g) +6H₂O

From above reaction it is clear that 4 moles of NH₃ react with 3 moles of oxygen.

So, 1 mole of ammonia react with = 3/4 moles of O₂

                                                       = 0.75 moles of O₂

Also, 1.18 moles of ammonia react with

= 1.18 × 0.75

= 0.885 moles of O₂

Thus, from above we concluded that ammonia is completely consumed in reaction. Therefore ammonia is limiting reagent.

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Answer:

1 cc always equals 1 mL.

Explanation:

The primary difference is that milliliters are used for fluid amounts while cubic centimeters are used for solids. No matter what is being measured.

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The name for aqueous [tex]H_{2} CO_{3}[/tex] is carbonic acid.

So, option C is correct one.

Binary hydrogen compounds with non metals may form H+ (proton) and an anion dissolved in water. The acidic solutions are named as if they were molecular acids , using the usual name for the compound itself , replacing hydrogen with hydro- and suffix -ide with ic. The word acid is then use.

The inorganic acid is an acid drive from one or more inorganic compounds. All inorganic acids form hydrogen ions and the conjugate base ions when dissolved in water.

Example: carbonic acid ( [tex]H_{2} CO_{3}[/tex] )

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A solution of acetic acid , on a laboratory shelf was of undetermined concentration. if the pH of the solution was found to be 2. 68 , then its the concentration of the acetic acid was  2×[tex]10^{-3}[/tex]

Calculation ,

A figure expressing the acidity or alkalinity of a solution on a logarithmic scale on which 7 is neutral, lower values are more acid and higher values more alkaline.

We have to find concentration of the acetic acid .

pH = 2. 68

pH = -㏒[ [tex]H^{+}[/tex] ]

2. 68  = -㏒[ [tex]H^{+}[/tex] ]

[ [tex]H^{+}[/tex] ]  = [tex]10^{-2.68}[/tex]

[ [tex]H^{+}[/tex] ]  = 2×[tex]10^{-3}[/tex]

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Answer:

? = 61.5%

Explanation:

To find the percent abundance of 4d nails, you need to use the following equation:

Percent Abundance = (number of nails / total nails) x 100%

Percent Abundance (4d) = (123 / 123 + 77) x 100%

                                          =  (123 / 200) x 100%

                                          = 0.615 x 100%

                                          =  61.5%

The main reason for this is Average bond of O₂ is shorter and strong from O₃.

Ozone is a blue gas composed of three oxygen atoms bonded together.

It occurs naturally high up in the Earth's atmosphere, where it protects the surface from harmful ultraviolet (UV) rays,

UV radiation will dissociate ozone into an oxygen atom and an oxygen molecule.

Ozone molecules are tetrahedral so the bond angle is  109 degree the electrons in the double bond occupy more space that the non-bonding electron pair.

Oxygen has a small size that leads to smaller O-O bond length.

A lone pair of electrons on both the oxygen repel each other leading to weakening of O-O bond.

O3 has longer and weaker bonds than O2, whereas SO2 has shorter and stronger bonds than SO.

Molecular oxygen, O2, is photolyzed by light of 241 nm and has a bond energy of 498 kJ/mol.

The main reason for this is Average bond of O₂ is shorter and strong from O₃.

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δg° for the reaction having e° cell = 2.04v. is 393.658kJ.

The lead (Pb) in the lead storage battery act as an anode

A voltaic cell or galvanic cell is an electrochemical cell that uses chemical reactions to produce electrical energy.

Anode where oxidation occurs Cathode where reduction occurs.

Therefore, Pb acts as anode and PbO2 act as a cathode.

Given,

E° cell = 2.04v

Faraday constant= 96485 C/mol

Moles of electron transferred n= 2

∆G = -nFE°

= -2 × 96485 × 2.04

= 393.658kJ

Thus we concluded that the δg° for the reaction having e° cell = 2.04v. is 393.658kJ.

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In lewis structure of HCN, we can observe one lone pair of electron.

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The results of photosynthesis are used by cellular respiration, and photosynthesis first uses the results of cellular respiration.

In the mitochondria, cellular respiration combines oxygen and glucose to produce ATP, along with water and carbon dioxide. Sunlight energy is used during photosynthesis to create glucose and separate oxygen from carbon dioxide and water. Globally, the exchange of carbon dioxide and oxygen during photosynthesis or cellular respiration serves to maintain stable levels of oxygen and carbon dioxide in the atmosphere.

Cellular Respiration: [tex]C_6H_1_2O_6+ 6O_2[/tex] → [tex]6CO_2 + 6H_2O[/tex]

Because CO₂ and H₂O are less energetic than the reactants, most notably glucose, the reaction is exothermic and has a negative enthalpy (ΔH < 0). This also makes sense because breathing causes glucose to be converted to energy.

Photosynthesis: [tex]6CO_2 + 6H_2O[/tex]→ [tex]C_6H_1_2O_6+ 6O_2[/tex]

The enthalpy change for the photosynthesis reaction is +2814 kJ/mol.

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The reactant [tex]O_{2}[/tex] is limiting if we begin with 9. 50 grams of al and 9. 50 grams of  [tex]O_{2}[/tex]   .

The reactant whose number of moles is present in less quantity is called limiting reactant .

Calculation,

Given mass of Aluminium and oxygen

Mass of Aluminium = 9. 50 grams

and Mass of oxygen = 9. 50 grams

Number of moles of aluminium = given mass / molar mass of aluminium

Number of moles of aluminium = 9. 50 grams/ 26.99 = 0.351 mole

Number of moles of oxygen = given mass / molar mass of oxygen

Number of moles of oxygen = 9. 50 grams/ 31.999  = 0.296 mole

The reactant [tex]O_{2}[/tex] is limiting because oxygen present in less quantity or in limiting quantity and consume rapidly.

Therefor , the reactant [tex]O_{2}[/tex] is limiting if we begin with 9. 50 grams of al and 9. 50 grams of  [tex]O_{2}[/tex]   .

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Answer:

3 half lives

Explanation:

5000 * (1/2)^n  = 625           where n = number of half lives

log ( 625/5000) / log(1/2) = n  = 3

5000         2500     1250      625  

The given description details the methods that are used in Mixing Zinc Phosphate for Permanent Cementation,

The complete description contains the following details:

Personal protective equipment (PPE) is required for the healthcare team, and the student is required to identify and prepare the instrument setup.

Equipment and Supplies

This refers to the use of cement to create a building structure that is used to keep things in place.

Hence, we can see that the Procedural Steps include:

Preparing the Mix

1. Dispense the powder toward one end of the slab and the liquid toward the opposite end.

2. Recap the containers.PURPOSE These materials can be affected by prolonged exposure to the humidity.

3. Divide the powder into small increments as directed by the manufacturer.

4. Incorporate each powder increment into the liquid.NOTE When increment sizes vary, smaller increments are used first. Mixing time per increment also varies; the time is approximately 15 to 20 seconds.

5. Spatulate the mix thoroughly, using broad strokes or a figure-8 movement over a large area of the slab.PURPOSE This aids in dissipating the heat generated during mixing.

6. Test material for appropriate cementation consistency. The cement should string up and break about 1 inch from the slab. Total mixing time is approximately 1 to 2 minutes

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The number of electrons, which are present in the nonbonding π molecular orbital of the allyl anion is "0".

Anions, cations, but also allylic radicals have always been frequently mentioned as reaction intermediates. Each one has three adjacent [tex]sp^{2}[/tex]-hybridized carbon centers, and they all rely on resonance for stability. Two resonance structures would be used to present each species, with the charge as well as unpaired electron scattered across both the 1,3 and 0 positions.

The Aufbau principle states that these orbitals would fill up based on the order of stability, therefore a typical pi bond, will have 2 electrons in the Pi orbital as well as zero in the Pi* orbital.

Therefore, the correct answer will be option (d)

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In the given reaction, Ag is acting as Lewis acid. the given statement is true.

A Lewis acid is a chemical substance with an empty orbital that can accept an electron pair from the a Lewis base to establish a Lewis adduct.

Because the silver atom has an open valence shell, AgCl is a Lewis acid. Lewis acid is an atom, ion, or molecule with an incomplete electron octet.

Even though Ag+ can accept an electron pair, it acts as a Lewis acid. It will then combine with chlorine and form AgCl.

Thus, the given statement is true.

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Considering the Dalton's partial pressure, the total pressure in the mixture of gases is 1.371 atm.

The pressure exerted by a particular gas in a mixture is known as its partial pressure.

So, Dalton's law states that the total pressure of a gas mixture is equal to the sum of the pressures that each gas would exert if it were alone:

[tex]P_{T}[/tex] = [tex]P_{1}+P_{2}+......+P_{n}[/tex]

where n is the amount of gases in the mixture.

Dalton's partial pressure law can also be expressed in terms of the mole fraction of the gas in the mixture.  So in a mixture of two or more gases, the partial pressure of gas A can be expressed as:

[tex]P_{A}[/tex] = [tex]X_{a}P_{T}[/tex]

In this case, the partial pressure of gas H₂ can be expressed as:

[tex]P_{H2}[/tex] = [tex]X_{H2} P_{T}[/tex]

You know:

[tex]P_{H2}[/tex] = 0.48 atm

[tex]X_{H2}[/tex] = 0.35

Replacing in the definition of partial pressure of gas H₂:

[tex]0.48atm = 0.35P_{T}[/tex]

Solving:

[tex]P_{T}[/tex] = [tex]\frac{0.48atm}{0.35}[/tex]

[tex]P_{T}[/tex]= 1.371 atm

In summary, the total pressure in the mixture of gases is 1.371 atm.

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Sometimes adding heating of substance set of answer options does not cause a change in temperature. resulting in an increase in temperature every time. results occasionally in a drop in temperature.

A substance's atoms and molecules move more quickly when it is heated. Whether the substance is a solid, liquid, or gas, this occurs. However, the temperature does not always rise when more heating of substance is added. For instance, adding heat to boiling water will not raise its temperature. This occurs when the heating of the substance reaches its boiling point, which is for all vaporizable substances. The average kinetic energy of the molecules will fluctuate when a system gains or loses heat. So long as a phase shift is not taking place, heat transfer causes a change in the system's temperature.

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The lipids are mostly made up of non-polar molecule type .

So , first option is correct one.

Lipids contains same elements as the carbohydrates like carbon , hydrogen , and oxygen ( C , H and O) . However lipids are mainly made up of hydrocarbon chain  ( or  rings ) and contain few polar hydroxyl groups ( -OH ) . This makes the most lipids non - polar hydrobhobic molecules and hey are not dissolve well in water. The lipids are mainly made up of glycerol and fatty acids .

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Answer:

2,2 - dibromo - 4,5,5 - trimethylhexane

Explanation:

When 2 equivalents of HBr are added to 4,5,5‑trimethyl‑1‑hexyne, the alkane (at the top right of the image) is formed. The bromine branches are added to the second carbon because the intermediate carbocations are the most stable on the secondary carbon. Below I have drawn the mechanism.

It will take 5.2 years to decay.

The half life of cobalt-60 is 5.2 years. The half life is the time taken for the mass of the substance to decrease by a half.

here, the amount of remaining substance is 50%,

so, [tex](\frac{1}{2} )^{n} = 0.5[/tex]

n. log (0.5) = log (0.5)

n = 1

So it would take 1 half lives to decay this much, which is 1 x 5.2 which is 5.2 years.

what do you mean by radioactive decay ?

The process through which an unstable atomic nucleus loses energy via radiation is known as radioactive decay, also known as nuclear decay, radioactivity, radioactive disintegration, or nuclear disintegration. A material that has unstable nuclei is considered as radioactive.

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A solution has a pOH of 7. 1 at 10∘c. Then the pH of the solution given that kw=2. 93×10−15 at this temperature is 7.4 .

It is given that,

pOH of solution = 7.1

Kw =2.93×10^(-15)

Firstly, we will calculate the value of pKw

The expression which we used to calculate the pKw is,

pKw=-log [Kw]

Now by putting the value of Kw in this expression,

pKw =−log{2.93×10^(-15)}

pKw =15log(2.93)

pKw=14.5

Now we have to calculate the pH of the solution.

As we know that,

pH+pOH=pKw

Now put all the given values in this formula,

pH+7.1=14.5

pH=7.4

Therefore, we find the value of pH of the solution is, 7.4.

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The answer choice which represents an aspect of the kinetic-molecular theory and can be used to explain compressibility of plasma is; Particles move independently of one another and are widely spaced.

The kinetic-molecular theory in discuss postulates about the states of matter.

Also, it is built upon the idea that matter is composed of tiny particles that are constantly in motion.

Hence, the theory is explanatory of the observable properties and behaviours of solids, liquids and gases and hence, explains the compressibility of plasma.

Remarks;

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The salt gives the most basic 0. 1 m solution in water is  NaNo₂.

Basic solutions are those solutions in which the concentration of OH- ion will always be greater as compared to the concentration of H+ ion in the solution.

If the solution is basic so after the dissociation, the formation of a strong base and a weak acid is a must in the solution.

NaNo₂ gets dissociated in water in the form of NaOH and HNO₂ and  NaOH is a strong base whereas HNO₂ is a weak acid due to which the solution becomes acidic.

Therefore, salt gives the most basic 0. 1 m solution in water NaNo₂.

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18mL of a 16M H₂SO₄ solution is required to prepare.

Dilution is the process of lowering a solute's concentration in a solution. It usually just involves mixing the solution with more solvent, and much more water. A solution is diluted when more solvent is added without increasing solute. The final mixture is thoroughly mixed to make sure that every component is the same.

The formula for the dilution of a solution is

                                       M₁V₁ = M₂V₂

where,

M is molarity and V is the volume of the solution in liters.

Known,

M₁ = 16M = 16 mol/ L

M₂ = 0.15M = 0.15 mol / L

V₂ = 2.0 × [tex]10^3[/tex] ml

    = 2L

∴ [tex]V_1 =\frac{M_2 V_2}{M_1}[/tex]

  [tex]V_1 = \frac{0.15 * 2}{16}[/tex]

       [tex]= \frac{0.3}{16}[/tex]

       [tex]= 0.018 L[/tex]

  [tex]V_1 = 0.018L[/tex]  × [tex]1000 mL[/tex]

       [tex]= 18 mL[/tex]

Therefore, 18mL of a 16M H₂SO₄ solution is required to prepare.

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The pH of the solution is determined by the hydrogen ion concentration. The pH of the solution with 1.5 M ammonia and 0.50 M hydrochloric acid is 8.77.

The potential of the hydrogen ion in the solution is called pH which determines the basicity and acidity of the solution.  

Given,

The molar concentration of 500 mL ammonia = 1.5 M

The molar concentration of 500 mL hydrochloric acid = 0.50 M

Kb (NH₃) = 1. 8 x 10⁻⁵

First, pOH is calculated as,

pOH = pKb + log [NH₃][HCl]

= - log 1. 8 x 10⁻⁵ + log [1.5][0.50]

= - log 1. 8 x 10⁻⁵ + log [3]

= 4.744 + 0.477

= 5.221

Now, pH is calculated from pOH as,

pH = 14 - pOH

= 14 - 5.221

= 8.77

Therefore, 8.77 is the pH.

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The state of energy that is forbidden is 2p orbital. The correct option is b).

The energy state of an electron depends upon the presence of the electron on the orbitals. Lower the energy they will be in the lower orbital. When they get higher energy they move to the higher orbital.

By using the Selection Rules for Electron Transitions

1.) ?l = +/- 1 and

2.) ?m = 0, +/- 1

The conservation of angular momentum is required by these laws. A photon's inherent angular momentum is 1. As 4p is higher than 2p and the electron is lowering its energy. So, it will go down to 2p orbital.

Thus, the correct option is b). 2p orbital.

The question is incomplete. Your full question is given below:

a) 3d

b) 2p

c) 1s

d) 2s

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1. The mole of sugar in the pop is 0.123 mole

2. The value of the sugar in the pop is 11.07 cents

3. The number of particles of the sugar in the pop is 0.74×10²³ particles

4. The concentration of the sugar in the pop is 0.36 mol/L

Mole = mass / molar mass

Mole of sugar (C₁₂H₂₂O₁₁) = 42 / 342

Mole of sugar (C₁₂H₂₂O₁₁) = 0.123 mole

1 mole of sugar = 90 cents

Therefore,

0.123 mole of sugar = 0.123 × 90

0.123 mole of sugar = 11.07 cents

From Avogadro's hypothesis,

1 mole of sugar = 6.02×10²³ particles

Therefore,

0.123 mole of sugar = 0.123 × 6.02×10²³

0.123 mole of sugar = 0.74×10²³ particles

Concentration = mole / Volume

Concentration of sugar = 0.123 / 0.342

Concentration of sugar = 0.36 mol/L

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The process that involves the breaking of intermolecular forces that hold an enzyme is known as denaturation.

What are enzymes?

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The normal boiling point of fingernail polish remover is 56℃  the vapor pressure of fingernail polish remover at the salon 0.027 atmospheric pressure

The pressure exerted by the vapors due to the atmosphere as it is surrounded by it only is known as vapor pressure and its unit is atm.

As air have small molecules which forms multiple layers and create pressure.

vapor pressure = {1/T1 - 1/T2}

T1 = 56 c

T2 = 22 c

substituting the values,

vapor pressure = [ 1/ 56 - 1 / 22 ]

                         = 0.027 atm.

Therefore, the vapor pressure of nail paint remover is 0.027 atm

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