( SCIENCE ! ) In 3–5 sentences, explain the reasons for the differences in daylight and darkness at the North Pole and South Pole on the December solstice.

In molecules fluoresce, the emitted photon has lower energy when compared to the absorbed photon.

The most extreme fluorescence is found in compounds having aromatic levels with low-energy π→π∗ transitions. A few aliphatic, alicyclic carbonyl, and positively conjugated double-bond structures also show fluorescence. Most unsubstituted aromatic hydrocarbons fluoresce in the solution again.

If a molecule soaks the light of one wavelength and emits it in another i.e., fluoresces, we reach that molecule as a fluorophore.

Some molecules are capable of being eager, via absorption of light energy, to a higher energy state, also named an excited state.

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Barium hydroxide is a strong diprotic base and phosphoric acid is a weak triprotic acid. Therefore the balanced acid-base reaction requires a 3:2 molar ratio:

First we find the moles of barium hydroxide reactant:

Volume of barium hydroxide (given) = V1=0.0300 L

Molarity of barium hydroxide (given) = C1=0.15 M

Moles of barium hydroxide = n1=V1×C1=0.0045 mol

For neutralization we require 2/3 the moles for phosphoric acid:

Moles of phosphoric acid = n2=23×0.0045 mol=0.0030 mol

Volume of phosphoric acid (given) = V2=0.0500 L

Molarity of phosphoric acid = n2V2=0.0030 mol/0.0500 L=0.060M

What is Neutralization Reaction?

3Ba(OH)2+2H3PO4→Ba3(PO4)2+6H2O

Conjugate base and acid are the results of the reaction between a Bronsted acid (proton donor) and a Bronsted base (proton acceptor). When both of these reactants have been completely consumed, leaving only the product species, a neutralisation reaction takes place. The stoichiometry of the balanced acid-base reaction equation is used to determine the ratio of molar amounts needed for neutralisation.

Therefore,

If 30.0 ml of 0.15 m ba(oh)2 was needed to neutralize 50.0 ml of an h3po4 solution. what is the concentration of the original h3po4 solution?

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The major organic product obtained  is

The right response is (D) (CH3)2CH2CH2CH2OH.

Alcohols react with PBr3 and become bromides.

​When bromides and magnesium combine, Grignard reagent is created.

What is a major product?

The main product of a reaction would be the one that is more stable and hence most likely to form. Propene added electrophilically to HBr would be one instance.

The right response is (D) (CH3)2CH2CH2CH2OH.

Alcohols react with PBr3 and become bromides.

​When bromides and magnesium combine, Grignard reagent is created.

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Those substances which do not have a fixed geometrical shape are called irregular objects an irregular object with a mass of 17g displaces 4.7 L of water and the density is 3.61gmL⁻¹

Here given data is irregular object are given and mass of this irregular object are =  17g and it displaces of water = 4.7 L

Then we have to calculate density = ?

Density is the substance's mass per unit of volume

Then Density = mass/volume

We assume that is displaces 4.7 L means this is volume

Thus, Density = mass/volume

Density = 17g / 4.7 L

Density = 3.61gmL⁻¹

An irregular object density is  3.61gmL⁻¹

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Answer:

11no:4.9%

Explanation:

4.9% bones are there in the human body in hips and legs

(IR) spectroscopy analyses a sample using infrared radiation. nuclear magnetic resonance (NMR) spectroscopy makes use of the spin states of protons and, to a lesser degree, other nuclei.

what is spectroscopy-infrared (ir) spectroscopy and nuclear magnetic resonance (nmr) spectroscopy?

As the name suggests, infrared (IR) spectroscopy analyses a sample using infrared radiation, which is a range of frequencies below the visible spectrum. However, IR spectroscopy works with wavenumbers as opposed to describing the light in terms of frequencies (the reciprocal of wavelength).

In order to identify a molecule, nuclear magnetic resonance (NMR) spectroscopy makes use of the spin states of protons and, to a lesser degree, other nuclei. The two spin quantum states that we identified as +1/2 and -1/2 for electrons are possible.

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If solution of Co(NO3)3 and KOH are mixed then following reaction will occur:

Co(NO₃)₃ + KOH → Co(OH)₃ + KNO₃

let us balance the equation:

Co(NO₃)₃ +3 KOH → Co(OH)₃ +3 KNO₃

Now we will split strong electrolyte into ions:

Co³⁺ + 3NO₃⁻ + 3K⁺ + 3OH⁻ = Co(OH)₃  +   3K⁺ + 3NO₃⁻

So the net ionic equation will be

Co³⁺  + 3OH⁻ = Co(OH)₃  

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The answer should be d) A and B are compounds and C is an element

Pure chemical elements and compounds can be found in nature. An element is a substance made of the same type of atoms as a compound, whereas a compound is made of various elements mixed together in a specific ratio.

The elements iron, copper, hydrogen, and oxygen are a few examples.

Color, density, hardness, and melting and boiling points are examples of physical qualities. The capacity of a substance to go through a particular chemical transition is described by its chemical property. We search for a chemical change to locate a chemical attribute. Mixture

The simplest substance that cannot be broken down chemically is an element. A compound is created by chemically combining two or more components. A mixture is created by physically combining two or more substances.

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The answer would be mantle rocks i.e., the partial melting of mantle rocks will yield basaltic magma, diorite granite peridotile rhyolite andesite.

The mantle rocks are partially melted because the mantle is comprises of many various kinds of minerals, it does not melt accordingly. As minerals with lesser melting points converted into liquid magma, those with inflated melting points endure as solid crystals. This method is called as partial melting.

The properties that aim partial melting Rocks is because of decompression, heat input, or addition of a flux.

Mantle rocks are also known as semi molten rocks , generally silicates are found there.

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To get 85g of nickel, 0.304 kilogram of the ore must be mined.

27.9% of what = 85g

0.279 * x = 85

x = 304.6g = 0.304kg

What is ore?

Ore is a naturally occurring rock or silt that has one or more precious minerals in it that may be extracted, processed, and sold for a profit. Metals are the most common valuable minerals found in ore. To remove the valuable metals or minerals from ore, it is mined from the earth and then processed or refined, frequently by smelting.

An ore is a naturally occurring collection of minerals from which metals can be profitably extracted. Originally, the term "ore" solely referred to metallic minerals, but today it also refers to nonmetallic materials that have been deposited in rock after it has formed.

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The SI unit for expressing the mass of a block of Au is gram with SI unit symbol g.

SI unit is a measurement unit which is universally accepted system. It is used for technical and scientific work.

The gram is the unit of mass in the International systems of units, SI. Gram is equal to 1/1000th of a kilogram.

Mass is used to measure an objects's weight. Most common units to express mass in metric system is gram and kilogram. The standard unit of mass in SI system is kilogram (Kg). The reason to use kilogram is because gram is a small amount.

Although, in case of Au, the SI unit to express mass of Au is g.

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A snow is basically made up of individual ice crystals which grow during suspended in the atmosphere, usually within the cloud. The snow fall is an example of precipitation.

For the formation of snow, the temperature required at the level of air at which it form must be below or at freezing 32° F or 0°C. Snow falls with the warmer air and it ends up on the ground in the form of rain. Rain also falls in colder layers and end up in the form of sleet. We also have the freezing rain which starts off in a warmer layer and freezes when the surface layer of air is below or at freezing.

Precipitation is a type of water phase which dorm in the atmosphere and falls on the earth surface.

Thus, we concluded that the snow falls ln a cold afternoon is an example of precipitation.

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Diamond has the highest melting point, which is close to five thousand.

covalent network solid

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The molecule in this pizza is a "protein" because it is already mentioned and cleared from the question that it is a polymer, hydrophilic, and it's made up of oxygen, hydrogen, and sulfur atoms.

Explanation :

Amino acid is a simple term defined as an organic chemical compound that comprises of an acidic carboxyl group (COOH), a basic amino group (NH_2NH2).

It is unique chain group.

Protein : The hydrophilic, macromolecule (polymer) that is made as a result of the unison of the chain of the many amino acids is known as Protein.

Protein normally comprises of various elements such as Oxygen (O2), Hydrogen (H2), Sulphur atoms.

Hence, it is pretty much clear from the above explanation that molecule in a pizza that is a polymer, has O2, H2 and Sulphur atoms and that is also hydrophilic is a molecule of "Protein".

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The mass upon volume take the measure of the substance is known to be its density.

As we know the formula of density is:

density = mass / volume. ------ (1)

Mercury is a heavy silver colored element.

Also called as a quicksilver , it's formula is Hg.

Mercury's atomic number is 80.

According to question,

It is given in the question,

Mass of mercury ( Hg) = 537.0537.0 g

Volume of mercury (Hg)  = 39.9939.99 ml

Now putting the given values in formula (1)

density = 537.0537.0 / 39.9939.99

​density = 13.42 g/ml

Hence, the density of mercury is 13.42 g/m

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I have 82 ml of a solution with a molarity of 5.3 m nabr. We can make 395.1 ml ,1.1M  NaBr solution from 82 ml of 5.3 M NaBr solution.

What is molarity?

The number of moles of solute per litre of solution is known as molarity or molar concentration, and it may be determined using the equation: To convert between the mass or moles of solute and the volume of the solution, utilise molar concentration.

The ratio of the moles of the solute whose molarity needs to be calculated is multiplied by the volume of solvent needed to dissolve the supplied solute.

Molarity (M) = moles of solute ÷ liters of solution

I have 82 ml (= 0.082 liter)  of a solution with a molarity 5.3 M NaBr. Here the moles of solute is-

        5.3 = Moles of solute ÷ 0.082

Or,   Moles of solute =  0.4346 moles

Now if we dilute the 82 ml, 5.3 M NaBr solution to make a new solution with a molarity of 1.1 M , the total volume of the new solution will be-

       1.1 = 0.4346 ÷ liters of solution

Or,   liters of solution = 0.3951

0.3951 liters = 395.1 ml

So,  we can make 395.1 ml ,1.1M  NaBr solution from 82 ml of 5.3 M NaBr solution.

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The acceleration of the rocket would be 150 m/s^2.

Initial velocity, u=1000 m/s

Final velocity, v=2500 m/s

Time taken, t=10 seconds.

According to equation of motion,

v=u+at

2500=1000+10a

2500-1000=10a

1500=10a

a=150 m/s^2.

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If one or more nucleotide pairs are deleted from a DNA strand, this is known as a frameshift mutation.

An indel (insertions or deletions) of a number of nucleotides in a DNA sequence that is not divisible by three results in a frameshift mutation, also known as a framing error or reading frame shift. The triplet structure of gene expression by codons means that an insertion or deletion might alter the reading frame (the arrangement of the codons), leading to a translation that is entirely different from the original. A frameshift mutation is different from a single-nucleotide polymorphism, in which a nucleotide is substituted rather than inserted or deleted, and the protein is more altered the sooner in the sequence the deletion or insertion occurs.

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Colony forming units/ml (CFU/ml) of the original sample are 2.1 * 10^8 CFU/mL according to the total plate count test.

The number of colonies created per given mL of the final diluted sample of the cultivated bacteria is measured by the colony forming units/ml (CFU/ml) of a given sample of cultured bacteria.

CFU = number of colony-forming units on the countable plate*1/FDF

where

FDF = final dilution factor

The sum of all dilution factors from the initial sample to the countable plate results in the final dilution factor.

As per the given data:

FDF = 1*10^-6

Number of the colony-forming units on the countable plate = 210

The colony forming units/ml (CFU/ml) of the original sample = 210*1/1*10^-6

The colony forming unit/ml(CFU/ml) of the original sample is 2.1*10^8 CFU/ml

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Separation techniques supercritical fluid and ionic liquid extraction techniques for nuclear fuel reprocessing and radioactive waste treatment are used to for minimizing the liquid waste

Supercritical fluid is the process of separating one component from another using supercritical fluids as the extracting solvent and ionic-liquid-based extraction separation method, which applies ILs as diluents and/or extractants for solvent extraction. advanced separations technology is key to closing the nuclear fuel cycle and relieving future generations from the burden of radioactive waste produced by the nuclear power industry separation technique utilizing green solvents carbon dioxide and for dissolution and extraction of uranium dioxide and fission product relevant to nuclear waste management that's why this two techniques for nuclear fuel reprocessing and radioactive waste treatment

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A cell containing 97% h₂o is placed into a 90% h₂o  solution. the solution is to the cell and there the size of the cell will shrink .

             Solute + Solvent = Solution

The cell will cremate because the water in the solution will gets released and there the state of equilibrium exists and that can be determined as Hypertonic solution.

A liquid that has a higher concentration of dissolved particles than regular cells and blood do, like salt and other electrolytes. For instance, wounds are soaked in hypertonic liquids.

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The bohr radius theoretically is the equal distance an electron can approach the nucleus in the hydrogen atom.

Bohr radius named after by Niels Bohr because Niels Bohr proposed the bohr model of an atom. Bohr radius is the mean radius of the orbit of an electron around the nucleus of a hydrogen atom at its ground state and is approximately equal to 5.29177×10⁻11 . the Bohr radius approximately equal to the most probable distance between the nucleus and the electron in a hydrogen atom in its ground state. so theoretically distance an electron is equal approach the nucleus in the hydrogen atom.

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The volume of the wood is 4.167 mL.

All three-dimensional objects have a certain amount of volume. It's the area that a particular object takes up.

Mass is the total amount of matter of an object or a particle. This term is also used to measure inertia, which is the body's resistance to acceleration when a net force is applied. A body's mass has an impact on how strongly it attracts other bodies through gravity.

The density of the wooden block is 30 g/mL.

The mass of the wooden block is 125 g.

So, m = 125 g

ρ = 30 g/mL

The density of an object is given as the mass of the object per unit volume.

Therefore,

density = mass / volume

ρ = m / V

V = m / ρ

V = 125 g / 30 g/mL

V = 4.167 mL

Hence, the volume of the block of wood is 4.167 mL.

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An aqueous solution of 0.783 m silver nitrate, has density of 1.11 g/ml. the mass percentage in the solution is 40.1%.

Water serves as solvent in an aqueous solution. It is mostly shown in the chemical equations by appending (aq) to relevant chemical formula.

Reactions in aqueous solutions are usually the metathesis reactions. Metathesis reactions are the another term for double-displacement; that is, when a cation displaces to form an ionic bond with the other anion. The cation bonded with latter anion will dissociate and bond with the other anion.

A common metathesis reaction in the aqueous solutions is a precipitation reaction. This reaction occurs when the two aqueous strong electrolyte solutions mix and produce an insoluble solid, also known as a precipitate. The ability of a substance to dissolve in the water is determined by whether the substance can match or exceed the strong attractive forces that water molecules generate between themselves. If the substance lacks the ability to dissolve in the water, the molecules form a precipitate.

let's take 1.00-L sample of this solution. Use given density to determine its mass

1.00L*1000mL/1L*1.47 g/1mL=1470 g

Now, this 1.00-L solution will contain

c=n V⇒ n=c*V

n=3.47moles/L*1.00L=3.47 moles

Use the molar mass of silver nitrate to help us how to determine grams of silver nitrate would contain this many moles 3.47

moles AgNO3

169.87 g*1mole AgNO3=589.4 g AgNO3

Now, solution's percent concentration by mass is defined as the mass of the solute, in your case silver nitrate, divided by the mass of the solution, and multiplied by 100

%w/w=mass of solute/mass of solution×100

Plug in your values to get

%w/w=589.4g1470g×100=40.1%

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The correct answer is a) Volume is directly proportional to the number of moles.

The Volume is directly proportional to the number of moles according to the Ideal Gas Equation.

Ideal Gas Equation is given as:

PV = nRT

where, P is the Pressure of the gas

V is the Volume of the gas

n is the number of moles of gas

R is the Universal Gas Constant

T is the Temperature

Since, it can be seen from the Ideal Gas Equation that the Volume is directly proportional to the number of moles, Universal Gas Constant and Temperature.

Similarly, Pressure is directly proportional to the number of moles, Universal Gas Constant and Temperature.

Also, the Pressure is inversely proportional to the volume of the gas.

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In the correct significant figures, the solutions to the given problems are;

The term significant figures refers to the number of important single digits in the coefficient of an expression in scientific notation.

61.2 m + 9.35 m + 8.6 m = 79.15 m

9.44 m – 2.11 m = 7.33  m

1.36 m + 10.17 m = 11.53 m

34.61 m – 17.3 m = 17.31 m

Thus, in the correct significant figures, the solutions to the given problems are;

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The molecular formula for both cis-2-butene and trans-2-butene is C₄H₈. compounds that have the same molecular formula but have different structures are called isomers.

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The calculated kinetic energy is 10.2 J

Measurements have been made of the cross section for the elastic scattering of electrons with energies lower than 10.2 eV by free hydrogen atoms. The signal from the electrons that were scattered by the beam appeared at the modulation frequency and at a predetermined phase, allowing for their identification. The ratio of the hydrogen atoms and the molecule's cross sections was directly measured, and absolute values for the atomic cross section were calculated using the absolute molecular cross-section.

The experimental findings support the theory.

Electron energy in the ground state is 0.13.6

In the second energy level, 3.4

Total energy level difference = 10.2

Thus, kinetic energy equals 10.2.

Therefore, we are aware that some electron kinetic energy was transmitted to the hydrogen atom during an elastic collision.

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The helicopter's velocity is 12.8 m/s

We can determine how quickly or slowly an object is traveling by using the phrases velocity and speed. We frequently encounter circumstances when we must determine which of two or more things is traveling quicker. If the two are traveling in the same direction on the same road, it is simple to determine which is quicker. It is challenging to identify who is moving the fastest when their motion is in the opposite direction. The idea of velocity is useful in these circumstances. Learn more about velocity in this article, including its definition, how it is measured, examples, and the distinction it makes from speed.

distance =352 meters

Time = 27.5 seconds

velocity =?

v= d/t

where;

V= velocity

D= distance

T=time

applying formula:-

v=352 /27.5

 =12.8 m/s

The helicopter's velocity is 12.8 m/s

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