Which bonding type has circular symmetry with respect to the bond axis?
a) sigma bond
b) pi bond
c) delta bond
d) covalent bond
e) ionic bond

The conjugate base of the acid Nh4+ is ammonia  NH3.

What is conjugate base?

A conjugate base is the base member, X-, of two compounds that convert into one another by acquiring or losing a proton, according to a more comprehensive definition. In a chemical process, the conjugate base has the capacity to either gain or absorb a proton.

The conjugate base's formula is the acid's formula less one hydrogen. The base that reacts changes into its conjugate acid. The conjugate acid's formula is the base's formula plus one hydrogen ion.

Because it gives an H+ ion to the water, NH+4 is the acid. After that, it turns into ammonia (NH3), which is the conjugate base of NH+4.

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When an electrical utility charges higher prices during the day than at night, it is practicing is peak load pricing.

The demand for the many goods is larger during certain times of the day or week. For example, the roads are congested during rush hours during the morning and evening commutes. Electricity has larger demand during day than at night. Ski resorts have large (peak) demands during weekends, and smaller demand during the week.

Economic efficiency is greatly improved by charging the higher prices during peak times. If utility were required to charge a single price at all times, it would lose ability to charge consumers an appropriate price during peak demand periods. Charging higher price during peak hours provides an incentive for consumers to switch consumption to off-peak hours. This saves the society resources, since costs are lower during those times.

An example is an electricity consumption. If consumers are charged higher prices during the peak hours, they are able to shift some electricity demand to night, the off-peak hours. Dishwashers, laundry, and the bathing can be shifted to off-peak hours, saving the consumer money and saving society resources. Electricity companies also promote the “smart grid” technology that automatically turns thermostats down when individuals and families are not at home… saving the consumer and society money.

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Due to the large specific heat capacity of water, Santa Monica Bay, off the coast of Los Angeles, experiences less seasonal temperature variation than the surrounding air.

What is specific heat capacity?

The amount of heat required to increase a substance's temperature by one degree Celsius (°C) in one gram is known as specific heat. Water has a high specific heat, which means that heating it up requires more energy than heating up other substances.

Specific heat capacity (symbol: c) in SI units is the quantity of heat in joules needed to elevate 1 gram of a substance by 1 Kelvin. J/kgK is another way to put it. It is also possible to express a specific heat capacity in terms of calories per gram of temperature in Celsius.

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269.8 temperature in kelvin of your freezer if the new volume of the bottle is 1.81

Kelvin having a thermometric scale on which the unit of measurement equals the Celsius degree and according to which absolute zero is 0 K, the equivalent of −273.15°C

Here given data is an empty 2.00 L soda bottle at room temperature (25.0°C) means 298.15 kelvin and then you put the soda in the freezer then the process is assumed to be a constant pressure and moles

Charles law applies V₂/V₁ = T₂/T₁

Then you have to use absolute temperature scale means in kelvin and 2 be the state solving

T₂ = T₁(V₂/V₁) = 298.15 K (1.81 L / 2L)

= 269.8 temperature in kelvin in the freezer if the new volume of the bottle is 1.81L

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Explanation:

density=mass÷volume

volume of irregular object= 71-61= 10 mL

density=125.5÷10

density= 12.55g/mL

Answer: thermal radiation

Explanation:

The mass of the second isotope is 49.08 u.

Average atomic mass is 45.737 u, while the abundance of isotope 1 is 40.149 u.

? isotope 2?

Process

1.- Determine the isotope 2 abundance: abundance isotope 1 plus abundance isotope 2 equals 100%

100 = 37.46 + abundance isotope 2

Amount isotope 2 equals 100 - 37.46 Amount isotope 2 equals 62.54

2.- Determine the mass of isotope 2. Average atomic mass = (abundance x mass isotope 1) + (abundance x mass isotope 2) 45.737 = (0.3746 x 40.149) + (62.54 x mass isotope 2) Mass isotope 2 = [45.737 - (0.3746 x 40.149)]

62.54 mass isotope 2 equals [45.737 - 15.0398] 62.54 mass isotope 2 equals 30.6972 62.54 mass isotope 2 equals 0.4908 x 100 mass isotope 2 equals 49.08 u

Isotopes are members of the same family of elements as that element but have varying numbers of neutrons. The Periodic Table's atomic number of an element is determined by the number of protons it contains. The atomic number 6 of carbon, for instance, has six protons.

Any of two or more types of chemical element atoms that have the same atomic number and essentially the same chemical behavior, but different atomic masses or mass numbers and different physical qualities

Uranium-235, uranium-238, tritium (hydrogen-3), chlorine-36, and carbon-14 are a few examples of radioactive isotopes. There are certain isotopes that have exceptionally lengthy half-lives (in the order of hundreds of millions of years). Stable nuclides or stable isotopes are the terms used to describe these isotopes.

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A certain ore is 27.9'.9% nickel by mass.  - 28544692. kilograms of this ore would you need to dig up to have 85.0 g85.0 g of nickel.

Chemical element nickel has the symbol Ni and atomic number 28. It is a beautiful silvery-white metal with a faint golden hue. The transition metal nickel is hard and ductile. Although bigger particles of pure nickel are slow to react with air under typical conditions because an oxide layer builds on the surface and limits further corrosion, pure nickel that has been powdered to increase reactive surface area exhibits high chemical activity (passivation).

Yet pure native nickel is only occasionally found in the crust of the Earth, typically in ultramafic rocks and the interiors of bigger nickel-iron meteorites that were not exposed to oxygen during their time outside the Earth's atmosphere.

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Vapours should be contained to the reaction flask.

What is  properly refluxing?

Reflux is the process of heating a chemical reaction for a predetermined period of time while steadily employing a condenser to cool the resulting vapour back into liquid form. The condensation of the vapours created above the reaction results in their constant return to the flask as a condensate.

Therefore,

When a reaction is properly refluxing, where should you see the vapors from the heated mixture

Vapours should be contained to the reaction flask.

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Answer:

has no nucleus; found in unicellular organisms

Explanation:

Hope It Helps

Sorry If I'm Wrong

Answer: Has no nucleus found in unicellular organisms

Explanation:

Prokaryotic cells are primitive cells found in lower organisms. Prokaryotic cells do not have a true cell.

A true nucleus lacks an envelope which contains the nuclear materials.

Most of the organelles lacks membrane bound organelles.

The true nucleus is lacking in prokaryotes.

Eukaryotic cells have true nucleus.

The mass of one mole of this unknown compound 'XY' is 76.26gm.

Given here, the 1 mol of unknown compund 'XY' and mass of X and Y are 35.67gm and 40.59 gm respectively.

Molar mass of XY = molar mass of X + molar mass of Y=35.67gm + 40.59 gm = 76.26gm.

We can find given mass of 'XY' compound by formula,

Mole = Given mass/Molar mass

1= Given mass /molar mass

Given mass = molar mass.

Given mass = 76.26gm.

So, the given mass of XY is equals to 76.26gm.

Mole is defined as the unit of amount of substance. The quantity of amount of substance is measured in mole as 1mol contain exactly 6.023×1023 particles or entities. Mole is calculated by the ratio of the given mass and the molecular mass of the compound.

The relation of mole and molarity is given by the formula, Molarity is equals to no. of moles of solute divided by the solution in litres. S.I unit of molarity is moles per litre.

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The maximum values of the electric and magnetic fields is 3.42*[tex]10^{-6}[/tex] T.

Electric fields arise from the electric charges and changing magnetic fields.

An electric charge, or collection of the charges, will have an associated electric field. Any charged object placed in this field will experience an electrostatic force as field interacts with the charge of the object. Field lines represent force a positively charged particle would experience if it were in the field at that point.

A changing magnetic field can also cause the electric charges to move. This phenomenon is commonly used in the electric generators to induce electric currents in wires. The induced current can be increased by causing the larger changes in the magnetic field or by coiling the wire so that more wire is affected by the changing magnetic field.

Magnetic fields arise from the permanent magnets and electric charges in motion.

Magnets can occur naturally (such as the Earth’s magnetic field), or they can be made by magnetizing the ferromagnetic materials.

Intensity I = 1.4*[tex]10^{3}[/tex] w/[tex]m^{2}[/tex]

Total Energy density  [tex]U_{avg}[/tex] = [tex]\frac{1}{2} E_{o}E_{o} ^{2}[/tex]

a) energy density = I/C

  Therefore,  1/2 [tex]E_{o}E_{o}^{2}[/tex] = I/C

     1/2 * 8.85 * [tex]10^{-12}[/tex] * [tex]E_{o}^{2}[/tex] = 1400/(3*[tex]10^{8}[/tex])

[tex]E_{o} ^{2}[/tex] = 105.46*[tex]10^{4}[/tex]

[tex]E_{o}[/tex] = 10.27*[tex]10^{2}[/tex] N/C

[tex]B_{o}[/tex] = [tex]\frac{E_{o} }{C}[/tex] = (10.27*[tex]10^{2}[/tex])/ (3*[tex]10^{8}[/tex]) = 3.42*[tex]10^{-6}[/tex] T

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The percentage error in using a buret to deliver 40.0 ml of solution into an erlenmeyer flask is 0.13%.

Given,

Theoretical value = 40ml

Experimental value = (40-0.05)ml = 39.95ml

%Error = |Experimental value - Theoretical value| / |Theoretical value| x 100

           = |39.95 - 40| / |40| x 100

           = 0.0499999 / 40 x 100

           =0.00125 x 100

           =0.125.

%Error = 0.13.

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1- butanol and (d) ethyl alcohol.

1- butanol and (d) ethyl alcohol.

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Liquid - Liquid Extraction - It a separation process comprising of the movement of a solute from one solvent to another, the two solvents being not mixable or partially mixable with each other.

Also known as solvent extraction

Organic layer is found to be at the bottom (more dense as compare to water) and aqueous layer found on the top (organic layer less dense as compared to water)  in the given liquid liquid extraction.

To find which layer in we can easily add distilled water to the funnel. Whatever layer increases in size must be the aqueous layer and the other is the organic layer.

We can also do the water drop test regarding the same.

Supercritical fluid manages all the different parameters such as temperature, pressure etc.

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Potassium will be forced out of the cell rather than into it if the combined strength of the chemical and electrical driving forces is greater.

The electrical potential gradient across the cell membrane and the concentration gradient of the permeant ion across the membrane together make up the net electrochemical driving force. The net driving force can be altered by changing either one. The potential difference across the cell membrane is known as the membrane potential of a cell, which is calculated as the inside potential minus the outside. It happens as a result of the cell membrane's ability to separate charges.

A cell's electromotive force (EMF) The highest potential difference between any two electrodes in a cell is known as the EMF.

Electrochemical forces: If the combined strength of the chemical and electrical driving forces is greater, potassium will be pushed out of the cell rather than into it.

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The final pH of a solution is 5.02 made by the addition of 10 ml of a 0.5 m NaOH solution to 500 ml.

What is pH?

The primary pH standard values are calculated using a concentration cell with transference, by measuring the potential difference between a hydrogen electrode and a standard electrode such as the silver chloride electrode. The pH scale is traceable to a set of standard solutions whose pH is established by international agreement. With the use of a glass electrode, a pH meter, or a color-changing indicator, the pH of aqueous solutions can be determined. In chemistry, agronomy, medicine, water treatment, and many other fields, pH measurements are crucial.

A scale called pH is used in chemistry to describe how basic or acidic an aqueous solution is. Lower pH values are recorded for acidic solutions (solutions with higher H+ ion concentrations) than for basic or alkaline solutions.

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A liquid is gently poured out, leaving the solid in the container, in a process known as decantation.

What is decantation?

The process of decanting is used to separate mixtures of incompatible liquids or liquid and solid mixtures, such as suspensions. The liquid that is closer to the top of the container—the less dense of the two liquids or the liquid from which the precipitate or sediment has settled out—is poured off, leaving the other component or the denser liquid of the mixture behind.

During the separation of two immiscible liquids, an imperfect separation is observed. Decantation, to put it simply, is the process of shifting the top layer of immiscible materials to another container in order to separate the contents.

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The chemical structure of the ammonium ion, NH4, resembles that of CH4 the most.

What is tetrahedral geometry?

When there are four bonds and no lone pairs in the core atom of the molecule, the molecule is said to be tetrahedral. With 109.5° angles between them, the atoms that are bound to the core atom are positioned at its four corners.

A central atom in tetrahedral molecular geometry is situated in the middle of the four substituents that make up the corners of the tetrahedron. Complexes with metals in the d0 or d10 electron configuration frequently have tetrahedral shape.

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Energy is released because it is a combustion reaction.

Combustion reaction -

Hydrocarbon bonds are broken during combustion events, and more energy is always released during the formation of water and carbon dioxide bonds than was consumed to break the initial hydrocarbon bonds. Burning materials that are primarily made of hydrocarbons produces energy because of this. This is an exothermic reaction.

2C₂H₆ + 7O₂ → 4CO₂ +  6H₂O + Heat

(ethane)

In the process of burning, or combustion, the reactant takes up oxygen and oxidizes it, releasing energy in the form of heat and light. It happens quickly. Along with the energy created during burning, carbon dioxide and water vapor are also produced.

Hence heat and light which are forms of energy are released during combustion reaction.

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Catalytic converters reduce the engine's tailpipe emissions of unburned hydrocarbons and carbon monoxide and can be recycled. The above statement is true.

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(a)The gas has a compressibility factor of 0.88 and a molar volume of 1.204 litre mol-1.

(b)The gas has a 1.12 compressibility factor and occupies a 2.682 litre mol^-1 molar volume.

What is  compressibility factor?

The compressibility factor (Z), often referred to as the compression factor or the gas deviation factor, is a term used in thermodynamics to describe how a real gas deviates from the behavior of an ideal gas. The molar volume ratio of a gas to an ideal gas at the same temperature and pressure is the simplest way to describe it.

(a) compressibility factor (Z)= Vm/Vmo

where Vm is the molar volume  and molar volume molar volume Vmo

putting the values we get :

Vm = 0.88 Vmo

Z= 0.88

therefore Vm = 0.88 x 0.0821 x 250 /15 litre mol^-1

(b) similarly we can calculate

Vm = Vmo + 0.12 Vmo

Therefore, after putting the values Z= 1.12

Vm= 1.12 x 0.0821 x 350 /12 litre mol^-1

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By using rule for dilation, scale factor used to create the bigger triangle will be (-2) when the small triangle is a pre- image.

  Coordinates of a point (x, y) dilated by a scale factor 'k' about a point (a, b) is given by,

Coordinates of the image point → [k(x - a) + a, k(y - a) + b]

Point of dilation → (2, -1)

Vertices of the smaller triangle (preimage) → (-1, -1), (2, 2) and (2, -1)

Corresponding vertices of the bigger or dilated triangle → (8, -1), (2, -7) and (2, -1)

By the rule of translation,

Image of vertex (-1, -1) → [k(-1 - 2) + 2, k(-1 + 1) - 1]

                                   → [(-3k + 2), -1]

image of the point (-1, -1) is (8, -1).

Therefore, (-3k + 2) = 8

                         -3k = 8 - 2

                          k = -2

    Hence, scale factor used to create the dilation will be (-2).

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The density is = 2.27 g/ml.

A certain object's mass in relation to its volume is measured by its density. High density is a term used to describe materials that are exceedingly compact and have a high mass.

A substance's density is defined as its mass per unit of volume. Density is most frequently represented by the symbol, however Latin letter D may also be used. Mass divided by volume is the definition of density in mathematics:

row = m/V

where is the density, m is the mass, and V is the volume.

Given in the question:

Mass of piece of sulfur= 227g

The volume of water that has been disoplaced= (150-50)mL =100mL

We can find the density by:

Density = Mass/Volume

Density =  227/100

Density = 2.27 g/ml

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Answer:

adrenal

Explanation:

The adrenal glands. (I kid you not)

The rate of such a reaction can be written either as r=AB OR r=A2

Since the, second order reactions can be of two types described below, rate can be given by

r=A×By

It is a chemical reaction in which rate of reaction is proportional to the concentration of each of two reacting molecules.

Initial Speed (M/s)

SECOND ORDER REACTIONS

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Answer:

Protons=12

Electrons=12

Neutrons=12