During a lab, a tablet i dropped into a bag and liquid i added. The ma of the tablet wa 20 g, the ma of the bag wa 50 g, the ma of the liquid wa 90 g. When the tablet hit the water, a chemical reaction took place and the bag filled with ga. If the ma of the liquid remained at 90 g, how much ga wa produced?

A quantum dot that emits yellow light with a wavelength of 537 nm. The total energy emitted is 223kJ.

Calculation:-

By Plank Einstein equation:

E = h \nu

h = 6.626×10-34Js

[tex]Also, we know, \lambda. \nu = c[/tex]

[tex]\lambda = 537 nm c = 3×108 m/s[/tex]

[tex]\nu = \frac{c}{\lambda }[/tex]

= (3× 108 m/s) ÷ 537×10-9 m

= 5.58× 1014 s-1

This photon will have the energy of:

E = 6.626×10-34 × 5.58×1014 J

= 3.701×10-19J

We know Avogadro's number,

1 mol = 6.022 × 1023 photons

The energy of 1 mole of photons :

= 3.701×10-19 J × 6.022× 1023

= 222914.9 J

= 223kJ.

The quantum dot size is inversely proportional to the bandgap energy level, thus changing the frequency of the emitted light and affecting its color. Smaller dots emit higher energy blue light while larger dots emit lower energy red light. The atomic arrangement near the surface differs from that near the center resulting in different electric fields and different manganese energy levels.

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If 45.3 ml of a 0.108 M HCL solution is needed to neutralize a solution of KOH, then grams of KOH that  must be present in the solution is 0.274gm.

The amount of a substance present in a certain volume of solution is termed as molarity . It can also be defined as the moles of a solute per liter of solution.

HCL +KOH --->  KCL+ H2O

Molarity= mol solute / L solution

Given volume of HCL= 45.3ml= 0.0453L

concentration = 0.108M

As we know that, No. of moles = concentration * Volume

=0.0453* 0.108

Number of moles=0.0048

Mass = no. of moles*molar mass

Molar mass of KOH = 56.1 g/mol

= 0.00489* 56.1

Grams of KOH= 0.274 gm.

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The relationship between the kinetic energy of particles and the forces of attraction between particles is that if average kinetic energy increases than  the force of attraction then particles will not condensed to form liquid or solid.

If the kinetic energy less than force of attraction between the particle then the particles will tends to form solid or liquid.  the kinetic energy is directly proportional to distance between the particles. The distance between the particles is inversely proportional to  the intermolecular forces.

Thus, The relationship between the kinetic energy of particles and the forces of attraction between particles is that if average kinetic energy increases than  the force of attraction then particles will not condensed to form liquid or solid.

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The lone pair electron in alcohol undergoes protonation and stabilizes the cation that is present in the oxygen atom. The final product contains both the ether and alcohol functional groups.

The chemical element with the letters O and the atomic number 8 is called oxygen atoms. It belongs to the chalcogen group of the periodic table and is a highly reactive nonmetal that readily forms oxides with most elements as well as with other compounds. Chemical elements, or substances with only one sort of atom, include molecular oxygen. An oxygen atom has eight protons in its nucleus, as indicated by its atomic number of 8 and the official chemical symbol O. The manufacture of steel, plastics, and textiles, brazing, welding, and cutting of steel and other metals, rocket propellant, oxygen therapy, and life support systems in aircraft, submarines, spaceflight, and diving are just a few common uses for oxygen. Since many organisms use molecular oxygen for respiration, molecular oxygen is necessary for life.

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Answer:

Chlorine only needs to make one covalent bond. It has seven e- so it needs one more to make a full octet.

Explanation:

H2 has the highest coefficient.

Considering a balanced equation,

4 H2+2 C

————>2 CH4

=> The hydrogen molecule's (H2) coefficient is 4.

=> The carbon (C) coefficient is 2.

=> Methane CH4 has a coefficient of 2.

As a result, H2 has the greatest coefficient of 4, which is.

H2 has the highest coefficient, hence.

Gases made of hydrogen have no color or smell. It is quickly set ablaze. It burns with a light blue, nearly undetectable flame once lit. They are lighter than air, the vapors. It ignites easily at a variety of vapor/air concentrations. While asphyxiating easily due to the displacement of oxygen in the air, hydrogen is not poisonous. 

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2.50% W/V of sucrose solution means 2.5 g per 100 ml solution. The molar concentration or molarity of the solution is 0.07 molar.

Molarity of a solution is the ratio of the number of moles of solute to the volume of solution in liter. It is the most common term to express the concentration of a solution.

Mass by volume percentage of a solution is the ratio of mass of the solute per 100 ml of the solution. Thus 2.50 % W/V of sucrose solution indicates that 2.5 g sucrose is present in 100 mL solution.

The molar mass of sucrose is 342 g/mol. Thus number of moles 2.5 g of sucrose is 2.5 /342 = 0.0073 moles. 100 ml solution is 0.1 L. Now the molarity can be calculated as follows:

molarity = 0.0073 mol /0.1 L

              = 0.07 molar.

Hence, molar concentration of sucrose solution is 0.07 molar.

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Using prefixes before the name of each element, the number of atoms of each element present in the molecular is indicated.

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The molarity of copper sulfate in the diluted solution if 4 ml of 0.0250 m cuso4 is diluted to 10.0 ml with pure water is 0.02M.

Molarity is defined as the ratio of moles of solute to the volume of solution.

Mathematically,

Molarity = moles of solute / volume of solution

Given,

Initial volume of CuSO4 = 4 ml = 4/1000 = 0.004 l

Molarity of CuSO4 = 0.0250 m

By substituting all the values, we get

0.025 = moles/ 0.004

moles = 0.025 × 0.004 = 0.000100 mol

Moles = 0.0001 mol.

Total volume = 0.004 l + 10 ml

= 0.004 + 0.001 = 0.005 l

Moles of CuSO4 = 0.0001 mol

Molarity = 0.0001 / 0.005 = 0.02 M

Thus, we concluded that the molarity of copper sulfate in the diluted solution if 4 ml of 0.0250 m cuso4 is diluted to 10.0 ml with pure water is 0.02M.

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Answer:

Four covalent bonds.

Explanation:

In a diamond, each carbon atom forms four covalent bonds with four other carbon atoms. In a diamond, each carbon shares electrons with four other carbon atoms.

Carbon can form single, double, or even triple bonds with other carbon atoms. In a single bond, two carbon atoms share one pair of electrons. In a double bond, they share two pairs of electrons, and in a triple bond, they share three pairs of electrons.

If the energy produced in an exothermic reaction is released as heat, it results in a rise in temperature.

In exothermic reactions, more energy is launched while the bonds are shaped in the goods that are used to interrupt the bonds inside the reactants. Exothermic reactions are observed with the aid of a boom in the temperature of the reaction combination. If materials react and the temperature of the aggregate will increase, the reaction is exothermic.

A chemical response includes the breaking of bonds within the reactants and the forming of bonds in the goods. It takes power to break bonds. when strength is launched in an exothermic response, the temperature of the response mixture will increase. when electricity is absorbed in an endothermic reaction, the temperature decreases. you could monitor modifications in temperature by placing a thermometer inside the response aggregate.

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It is a dissociative substitution process.

Write the reaction mechanism

Step 1:

    Ni(CO)₄  →  Ni(CO)₃ + CO

Step 2:

    Ni(CO)₃ + CO + L →  [Ni(CO)₃L

In the first step of the reaction or in the rate-determining step nickel tetracarbonyl dissociates into nickel tricarbonyl and carbon mono oxide. As the first step is the rate-determining step in which dissociation occurs so it is a dissociative mechanism. In the second step phosphines and phosphites replace carbon monoxide at the same rate, in simple words this step is the same for different phosphines and phosphites. This is because it is an SN1 reaction so the second step does not affect the rate of reaction.

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The new volume will be "56.2 mL"  assuming the moles of gas and temperature are held constant .

What is Ideal gas law ?

The ideal gas law (also called the perfect gas law), the relationship between the pressure P, volume V, and temperature T of a gas in the boundary region between low pressure and high temperature. Gas molecules move almost independently. each other.

PV = nRT, where n is the number of moles of gas and R is the universal (or perfect) gas constant, 8.31446261815324 joules/kelvin/mol (the universal gas constant is defined as Avogadro's number NA multiplied by Boltzmann's constant k) . ) In the International System of Units, energy is measured in joules, volume in cubic meters (m3), force in newtons (N), and pressure in pascals (Pa). where 1 Pa = 1 N/m2. A force of 1 Newton moving a distance of 1 meter does 1 Joule of work. Therefore, the product of both PV and nRT has the dimension of work (energy).

By using the Boyle's Law, we get

P1V1 = P2V2 ; we can find

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Answer:

There is a d sublevel in the third energy level, but it requires the electrons to have energy similar to electrons in the fourth energy level. The 3ds orbitals are not filled until after the 4s is filled.

Explanation:

Answer:

When you balance a chemical equation, you change (!!YOU MUST CHANGE IT DO NOT FORGET!!) coefficients. You never change subscripts. A coefficient is a whole number multiplier. To balance a chemical equation, you add these whole number multipliers (otherwise known as coefficients) to make sure that there are the same number of atoms on each side of the arrow.

For those of you who may not have a clear understand of what a coefficient is, here's a simple definition that you can look at. A coefficient can be simply explained a number or symbol by which another number or symbol (as a mathematical variable) is multiplied.

Also, here's a simple definition of a subscript! A subscript is a distinguishing symbol (such as a LETTER OR NUMERAL) written immediately above or below and to the right or left of another character.

Here's an example.

The equation that were trying to solve is:

Zn + 2HCl ---> ZnCl^2 + H^2

Answer:

There are two chlorines on the right but only one on the left, and the chlorine is in a single chemical species on each side. Put a 2 in front of the HCl on the left hand side.

Zn + 2HCl ---> ZnCl^2 + H^2

And if you look carefully, you will see that the equation is now balanced, with one Zn on each side, two hydrogens on each side and two chlorines on each side. Some examples can be rather easy!

Explanation:

Like always, don't have a good day, have a great day!

Balanced equations for the following reactions along with the states are:

Zn (s) + 2 HCl (aq)   ZnCl₂ (aq) + H₂ ( g)

Sn (s) + PbSO₄ (s)  →  Pb (s) + SnSO₄ (s)

a. Chemical equation

   Zn (s) + HCl (aq)  →  ZnCl₂ (aq) + H₂ ( g)

   Balanced chemical equation

   Zn (s) + 2 HCl (aq)   ZnCl₂ (aq) + H₂ ( g)

b. Chemical equation

   Sn (s) + PbSO₄ (s)  →  Pb (s) + SnSO₄ (s)

   Balanced chemical equation

   Sn (s) + PbSO₄ (s)  →  Pb (s) + SnSO₄ (s)

c. Chemical equation

   Mg (s) + Cu(NO₃)₂ (aq)  →  Mg(NO₃)₂ (aq) + Cu (s)

   Balanced chemical equation

   Mg (s) + Cu(NO₃)₂ (aq)  →  Mg(NO₃)₂ (aq) + Cu (s)

d. Chemical equation

   Ag (s) + H₂SO₄ (aq)  →  Ag₂SO₄ (aq) + H₂ ( g)

   Balanced chemical equation

   2 Ag (s) + H₂SO₄ (aq)  →  Ag₂SO₄ (aq) + H₂ ( g)

e. Chemical equation

   Fe (s) + H₃PO₄ (aq)  →  Fe₃(PO₄)₂ (aq) + H₂ ( g)

   Balanced chemical equation

   3 Fe (s) + 2 H₃PO₄ (aq)  →  Fe₃(PO₄)₂ (aq) + 3 H₂ ( g)

f. Chemical equation

   Pb (s) + CH₃COOH (aq)  →  Pb(CH₃COO)₂ (s) + H₂ ( g)

   Balanced chemical equation

   Pb (s) + 2 CH₃COOH (aq)  →  Pb(CH₃COO)₂ (s) + H₂ ( g)

(Complete question)

write the equations for the following reactions. Make sure to balance the equation and include the states. a.) zinc metal and hydrochloric acid b) tin metal and lead sulfate c) magnesium metal and copper nitrate d)silver metal and sulfuric acid e) iron metal and phosphoric acid f) lead metal and acetic acid.

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The compound that is made up of exactly two atoms is option B.

The term compound has to do with something that is formed by the combination of two or more atoms. We know that these atoms are components of elements. We have to say here that there is almost no limit to the number of atoms that could be combined in a compound.

Let us look at the images that we have in the options. The compound that would be made up of two a toms would have only two colors of balls in its depiction and that is what we must look out for.

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The mass of NaCl required ( in grams) to make the aqueous solution is 1.287 g.

What is molecular mass? How do you calculate molecular mass?

A molecule's mass is the sum of the masses of all the atoms it contains. As it is the total mass of all the atoms in a molecule, it is calculated below

The molecular mass of NaCl = Atomic mass of Na + Atomic mass of Cl

                                               = 23 + 35.5

                                               = 58.5g/mol

Given the volume of aqueous solution = 120.4 ml or 0.1204 L

Molarity of solution = 0.183M

We know that,

Molarity = No. of moles/Volume

No. of moles = 0.183 × 0.1204

                      =  0.022 moThe molar.

Molar mass of NaCl = Mass of Na + Mass of Cl

                                 = 23 + 35.5

                                 = 58.5g/mol

Mass of NaCl = 0.022 × 58.5

                      = 1.287 g

So, the mass of NaCl required ( in grams) to make the aqueous solution is 1.287 g.

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Molecules with a plane of symmetry between the chiral centers are achiral and meso. From the given molecules (Picture attached) only (A) compound 1 is meso.

When compounds possess a plane of symmetry between the chiral centers they are called achiral or meso compounds. Among the given compounds (A) compound 1 have a plane of symmetry. So we can say compound one is a meso or achiral compound. Compounds two, three, and four have no plane of symmetry, as you can see in the structures attached. So all other compounds (compound 2, compound 3, and compound 4) except compound one are not meso or achiral.

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The number of grams of Zinc used is 1962g, the volume of hydrogen gas formed at STP is 672.071L and the molar concentration of Zinc Chloride is 300M.

1. The number of moles of Zn used up is given by the equation:

n = CV

Since the volume is given in mL, we must convert it to L before plugging it into the equation.

n = (300 mol/L)(100 mL)(1 L/1000 mL)

n = 30 mol

The molar mass of Zn is 65.39 g/mol, so the number of grams of Zn used up is given by:

m = nM

m = (30 mol)(65.39 g/mol)

m = 1962 g

2. The number of moles of H₂ formed is also 30 mol. One mole of any gas occupies 22.4 L at STP, so the number of liters of H₂ formed is given by:

V = nRT/P

V = (30mol)(0.08206 L•atm/mol•K)(273 K)/(1 atm)

V = 672.071 L

The volume of liters of H2 formed is 0.6L

3. The molar concentration of ZnCl₂ is given by the equation:

C = n/V

Here, number of moles is n and the volume is V The number of moles of ZnCl₂ is 30 mol, and the volume is 100 mL, so the molar concentration is:

C = (30 mol)/(0.1L)

C = 300 M

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The stereoisomers of 2-chloro-5-methyl heptane Iis in the 2 chloro 5 methyl hectare.

In stereochemistry, stereoisomerism, or spatial isomerism, is a form of isomerism wherein molecules have an equal molecular method and series of bonded atoms, however, fluctuate inside the 3-dimensional orientations in their atoms in area.

Stereoisomers are isomers that fluctuate inside the spatial arrangement of atoms, in preference to the order of atomic connectivity. one in every of their most exciting sort of isomers is the replicate-image stereoisomer, a non-superimposable set of molecules that are a replicate image of one another. Stereoisomers are isomeric molecules with identical chemical formulas but exceptional atomic arrangements. for this reason, they own similar chemical and physical homes.

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The particle model represents particles as small solid spheres. The limitations of this simple model are we don’t know the size of the particles, and we don’t know how much space is between particles.

The term particle model is define as a model that describes the arrangement and movement of particles in a substance. This mode is used to explain the physical properties of solid, liquid and gases.

All matter is made up of very small indivisible particles. They are too small to see. These particles do not share the characteristics of the material they make up. There is nothing in the space between the particles that make up matter.

Thus, The limitations of this simple model are we don’t know the size of the particles, and we don’t know how much space is between particles.

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A limiting reagent is one that is completely consumed during a reaction, hence restricting the product's yield. Compared to the limiting reagent, the other reactant(s) are present in excess.

The amount of product that could be produced based on the molar ratios is known as the theoretical yield. The amount that was actually retrieved is divided by the theoretical yield to determine the percent yield. For this amount to be expressed as a percentage, multiply it by 100.

Acetylation is an organic esterification reaction using acetic acid in organic chemistry. It gives a chemical molecule an acetyl group. These substances are known as acetate esters or just acetates. The opposing reaction, deacetylation, involves removing an acetyl group from a chemical molecule.

Deacetylation is the removal of an acetyl group from an organic chemical molecule, whereas acetylation is the introduction of an acetyl functional group (acetoxy group, CH3CO) into an organic chemical compound, specifically the substitution of the acetyl group for a hydrogen atom.

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The increasing ionization energy order is Na< Al < B < C.

The ionization energy decreases in groups from top to bottom and increases over time from left to right. Therefore, helium has the highest initial ionization energy and francium has the lowest one. The ionization energy increases because the ratio of protons to electrons increases.

The higher the ionization energy the more difficult it is to remove an electron. Therefore, ionization energy is a measure of reactivity. Ionization energy is important because it can be used to predict the strength of chemical bonds. The process by which electrically neutral atoms or molecules are transformed into charged atoms or molecules by gaining or losing electrons.

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5.323 gm is the theoretical yield and 133.5 is the percentage yield .

What is chemical reaction ?

Chemical reaction is a  process in which one or more substances are transformed into one or more other substances (products). Substances are either chemical elements or compounds. Chemical reactions rearrange the constituent atoms of reactants to produce different substances as products.

Chemical reactions are an integral part of technology, culture, and even life itself. Fuel combustion, iron smelting, glass and pottery making, beer brewing, and wine and cheese making are just a few examples. Activities involving chemical reactions that have been around for thousands of years. Chemical reactions are more in a variety of processes occurring in the Earth's geology, atmosphere and oceans, and in all biological systems.

Cl2 is limiting reagent , moles of cl2 = 0.091

moles of NaCl = 0.121

Theoretical yield of NaCl will be 0.091 moles = 0.091 moles X 58.5 g/mole = 5.3235 g

percentage yield = (7.11/5.3235) X 100 = 133 %

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Thermochemical C2H5OH(l) + 3 O2(g) → 2 CO2(g) + 3 H2O(l) ΔHcomb = -1367 kJ/mol

What is Thermochemistry?
The study of thermochemistry examines the heat energy involved in chemical reactions and/or phase transitions like melting and boiling. Energy can be released or absorbed during a reaction or phase change. Thermochemistry focuses on the heat-based energy transfer between a system and its surroundings. In order to forecast the quantities of reactants and products throughout a specific reaction, thermochemistry is helpful. It is also used to foretell whether a reaction will be spontaneous or non-spontaneous, favourable or unfavourable, in conjunction with entropy determinations. While exothermic reactions discharge heat, endothermic reactions absorb heat. The concepts of thermodynamics and the idea of energy in form of chemical bonds are combined in the field of thermochemistry.

Thermochemical is the relation between heat ,work, temperature and energy.

We can only use the energy quality when it's high,

It means that heat easily cover when the gallon is burn.

The energy of the fuel has ready converted into heat .

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The molar heat of the vaporization of the ammonia is 23.3 kJ / mol.  the molar heat of condensation of the ammonia is - 23.3 kJ / mol.

The molar heat of condensation is just opposite to the molar heat of vaporization. the molar heat of vaporization of ammonia is given ad :

ΔH vaporization = - ΔH condensation

so, the heat of condensation for the ammonia i given as:

ΔH condensation = - 23.3 kJ / mol.

Thus. The molar heat of the vaporization of the ammonia is 23.3 kJ / mol.  the molar heat of condensation of the ammonia is - 23.3 kJ / mol.

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The product formed in the reaction of 2−methyl−1−butene with bromine in water will be 1-bromo-2-methylbutan-2-ol (Structure attached)

A reaction mechanism is a representation of step by step transfer of electrons and molecules from one compound to another compound. In reaction mechanisms, the curved arrows show the moment of electrons.

In the reaction mechanism of 2-methylbut-1-ene the double bond of 2-methylbut-1-ene act as an attacking group and attacks Br₂. As a result, one Br atom gets attached to 2-methylbut-1-ene. This results in a cyclic brominium ion generation, which makes the neighboring carbon more substituted. Water molecule then attacks on the more substituted carbon and 1-bromo-2-methylbutan-2-ol will generate as the major product.

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The forming pores in bacterial plasma membranes and inhibiting cell wall synthesis is antimicrobial peptides.

Lysosomes are membrane-bound cellular organelles that contain digestive enzymes. Lysosomes are involved in various cellular processes. Breaks down excess or worn-out cell parts. They can be used to destroy invading viruses and bacteria. Opsonization is an immune process that uses opsonization to mark foreign pathogens for elimination by phagocytic cells.

Without an opsonin such as an antibody, the negatively charged cell wall of the pathogen and the scavenger cells repel each other. Examples of opsonins are antibody molecules such as IgM, which can activate the complement system to sensitize antigens to phagocytosis. In addition to phagocytosis opsonization also promotes antibody-dependent cell-mediated cytotoxicity.

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