when the reaction was completed, why was the reaction mixture poured onto ice? choose all that apply.

The calcium chloride concentration to be thrown on the concrete should not exceed 2%.

Calcium chloride solution is a compound that is used to remove the eyes from the dry base during the winter season in the cold are region of the world.

Calcium chloride releases heat when spread over the ice. This released heat melts the ice.

Calcium chloride has a much lower melting point than that of the ice, it release 3 ions when it dissociates on the surface of the ice. This allows the eyes to melt.

But the concentration of the calcium chloride solution that has to be added to the concrete should not exceed 2% because further concentration may harm the quality of the concrete which is not a good thing.

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The reaction is exothermic in this Hydrogen, when combined with oxygen in a chemical reaction, forms water.

The response among hydrogen and oxygen is exothermic- it releases power to the surroundings: hydrogen + oxygen → water 2H2 + O2 → 2H2O Fuel cells use the response among a gasoline and oxygen to provide electric energy. Hydrogen is flamable and it burns with a popping sound in oxygen with an nearly colourless flame to shape water molecules and launch heat.

This response is noticeably exothermic. Formation of water from hydrogen and oxygen is a aggregate response due to the fact hydrogen and oxygen are combining to shape unmarried product. The response takes place as follows: 2H2(g)+O2(g)→2H2O(l). The response of hydrogen with oxygen to shape water is an exothermic response.

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The wavelength is 3.975 × 10^-19 J.

Wavelength can be difined as the distance between two successive crests or throughs of a wave.

To find out the energy in joules given the wavelength of a photon we have to  Use the  Planck's equation E = h x c / λ and substitute the values of   the wavelength (λ), Planck's constant in joules (h = 6.6261 × 10⁻³⁴ J⋅s), and speed of light (c = 299792458 m/s). With these units, you'll get an energy result in joules (J).

Energy of photons,

E = hc/λ

(6.626 × 10-34Js) × (3 × 108ms-¹)/

5 x 10-7

= 3.975 × 10^-19 J

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in the lewis resonance structure for ammonium ion (nh4 ) in which the central n atom is singly bonded to each of the four h atoms on the n atom positive charge is present.

Ammonia is a colorless, intensely unpleasant gas with a pungent, choke-inducing smell. It readily dissolves in water to produce an ammonium hydroxide solution that can irritate the skin and burn. Ammonia gas is easily compressed and, when put under pressure, turns into a clear, colorless liquid.

The ammonia has normally three hydrogen attached to central nitrogen atom carrying lone pair. When fourth hydrogen attaches to the central atom positive charge appear on the central atom.

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Alanine, arginine, glutamine, and histidine are all amino acids, but they are classified differently based on their side chains.

Thus, alanine is neutral nonpolar, arginine is basic, glutamine is neutral polar, and histidine is acidic.

Since the task isn't complete, here's the full question:

Classify these amino acids as acidic, basic, neutral polar, or neutral nonpolar.

Drag each item to the appropriate bin.

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This atom is most likely to have a charge of -2, +4, +6 oxidation state.

Sulfur has mass the of 32.07 u and its atomic number is 16.

In the oxidation states of 2, 4, and 6, respectively, sulfur can form the compounds sulfide , sulfite, and sulfate. It blends with almost all other components. Because sulfur exhibits catenation, or the bonding of one identical atom to another, second only to carbon, some sulfur compounds have an interesting property. As a result, sulfur atoms can organize into chains and ring systems. There are  the major important sulfur compounds and chemical groups.

Sulfur usually is on -2, +4 or +6 level of oxidation states  (but it can be also on the  5, 3, 2, 1, -1 ).

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The volume of a rectangular box with length of 25.0 cm width of 7.0 cm and height of 3.5 cm is 612.5 cm³

Volume is a measure of the occupied three-dimensional by its  space. It is often used to quantified numerically me know using SI derived from the center units or by the way various imperial or US customary units. The speed of definition of length is interrelated with the volume.

The volume of cuboid can be calculated by multiplying the width and length and height all together

Here,

Length = 25 cm

Width = 7 cm

height = 3.5 cm

So volume of the box is:

= 25×7×3.5

= 612.5 cm³

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The flaw in Regina’s plan is that the time frame is unrealistic (option B).

Goal setting involves the development of an action plan designed in order to motivate and guide a person or group toward a goal, which is a result that one is attempting to achieve.

Effective goal setting lets you measure progress, overcome procrastination and visualize your dreams. However, setting goals is said to be effective when it is done in an adequate time frame.

According to this question, Regina identifies her goal and hastily writes it down as follows: I will make an A on my English literature term paper that is due next week.

This goal, although is great, is unlikely to be met because of the time frame. One cannot get an excellent result in something that lacks adequate preparation, which includes adequate time.

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the energy of a photon that is emitted as a hydrogen atom makes a transition between the n is 13.6(n^2 - 1)/n^2 eV

From the hydrogen atom's first excited state to its ground state, an electron transitions.

the given part is

   n1 = 1  and   n2 = n

The energy of photon released,

E=13.6(1/n1^2 – 1/n2^2) eV

= 13.6(1/1^2 – 1/n^2) eV

= 13.6(n^2 - 1)/n^2 eV

The following hypotheses form the foundation of Bohr's model:

• He hypothesized that an atom's electron can move within a specified stable, circular orbits around the nucleus without producing radiation.

• Bohr discovered that the electron's angular momentum is quantized in size.

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Wooden products like plywood and table boards contain formaldehyde.

Formaldehyde is the first member of the aldehyde family of alkane.

It contains a double bond between the carbon and the oxygen atom and forming one single bond with each of the two hydrogen atoms.

Formaldehyde is a naturally occurring chemical which can be found in the wooden products like plywood and table boards that are used on the daily basis in our homes.

Apart from this, the Paints, cosmetics and some synthetic fibers also contains formaldehyde.

Formaldehyde is also a very crucial part of the formation of many polyesters.

So, it can also be found in polyester based products.

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Gabriel synthesis produces primary amine through an SN2 reaction.

A primary amine is produced by the Gabriel synthesis using the SN2 reaction. Phthalimide is first deprotonated using a base to form a nucleophile. The original structure is inverted due to the negatively charged N attacking the alkyl halide from behind. Acid hydrolysis, base hydrolysis, or the application of hydrazine are all methods for liberating the main amine. The S configuration of the alkyl halide reactant is present. Gabriel synthesis involves an SN2 reaction,

Hence, the main alkyl amine product will be configured as R.

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It is diprotic because it contains two ionizing H atoms. The balanced equation is HSO3- ==> H + SO3-,

However, I believe the question is only requesting the first one to demonstrate that it produces H3O+. H2SO3 plus H2O equals H3O+ plus HSO4 in the net ionic equation. -

Diprotic acids include two acidic hydrogen atoms and include sulfuric acid (H2SO4), carbonic acid (H2CO3), hydrogen sulfide (H2S), chromic acid (H2CrO4), and oxalic acid (H2C2O4).

In an aqueous solution, a diprotic acid is an acid that has the capacity to contribute two hydrogen ions (H+) or protons per molecule. A dibasic acid is another term for a diprotic acid. A polyprotic acid, or an acid with the capacity to contribute more than one proton per molecule, is a form of diprotic acid.

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No, if the hydrogen atom's energy were proportional to n (or any power of n), it would become infinite as n increased in size. However, n2 has an inverse relationship with the atom's energy. As a result, as n increases to infinity, the atom's energy gets closer to the ionization energy, or 13.6 eV, which is a value that is a finite amount above the ground state. Its energy loss is never greater than the ionization energy as the electron transitions from one bound state to another. Any emitted photon has a limited amount of energy and frequency.

As n rises, energy magnitude decreases, but the electron's energy rises because of the negative sign.

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If the bond angle between two adjacent hybrid orbitals is 109.5° , the hybridization is sp³ .

When s orbitals combines with three p orbitals (px, py and pz)  four sp³ hybrid orbitals with similar characteristics are formed. These hybrid orbitals have a bond angle of 109.5° between them, which causes the minimum electronic repulsion between them.

An atom in which all the atoms that are bonded to it contains single bonds is an  sp³ hybridized atom. For example-alkanes.

For, sp³ hybridized central atoms, the molecular geometry is a tetrahedron. But, if the geometry is distorted due to lone pairs then trigonal pyramidal or bent geometry is formed.

Thus, option "c" is correct.

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The potential of a cell Eocell = Eored − Eooxid

Any electrochemical cell must have two half-cells in order to be functional. Without actually building the cell, the processes that will take place and the standard potential of a cell for any pair of two half-cells can be predicted using the table below. According to the table, reduction will take place inside the cell on the half-cell with the highest reduction potential. The cell will oxidise the half-cell with the smaller reduction potential. The entire cell potential will be a positive value if those conditions are met. For a cell to spontaneously undergo a redox reaction in the opposite direction, the cell potential must be positive.

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The effect of intermolecular attraction on the properties of gas becomes more significant.

A gas is a substance that has no constant size or form. Whilst inside a closed container, gasoline will amplify to fill the field. An instance of gas is the air you breathe. The gas interior of your digestive tract is fabricated from the air and different gases.

Traits of Gases :

* Gases have neither definite shape nor particular volume. They expand to the dimensions of their container.

* Gases are fluid and go with the flow effortlessly.

* Gases have low density, except compressed.

* Gases diffuse (mix and unfold out) and effuse (tour thru small holes).

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tert−Butyl iodide or tert−Butyl chloride, tert−Butyl iodide reacts at the faster rate.

Unimolecular nucleophilic substitution process is equivalent to the SN1 reaction.Reactions occur in a single order.An illustration of an SN1 reaction is the hydrolysis or tert-butyl bromide in an aqueous NaOH solution.

Two of the most frequent chemical reactions in organic chemistry are SN1 and SN2.SN1 is a substitution-nucleophilic addition reaction that frequently involves both benzene and carbonyl compounds.Another kind of nucleophilic substitution known as an SN2 is more frequently seen with alkyl halides and benzoins.

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According to the statement, this implies that the number of neutrons is equal to the number of protons. Correct answer: letter A.

This is because the N/Z ratio (Neutron/Proton ratio) is equal to 1.

Stable isotopes are atoms that have the same number of protons and neutrons in their nucleus. This means that the N/Z ratio of these atoms is 1, which implies that the number of neutrons is equal to the number of protons. Stable isotopes are essential for many scientific and technological applications such as research in:

Stable isotopes are typically found in elements with low atomic numbers. This is due to the fact that low atomic numbers indicate a low number of protons, which in turn implies fewer neutrons are needed to achieve the N/Z ratio of 1. This is why elements such as hydrogen, helium, and lithium are typically found to have more stable isotopes than other elements.

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The partial pressure of ne 1.1 atm, hence the Correct Option is a).

Solution:

partial pressure of Ne = mole fraction x total pressure

10/20 / 10/20+ 10/40 = 0.6875

partial pressure of Ne = 1.6 x 0.6875 = 1.1 atm

or

Moles of Ne = 10/20 = .5 moles

Moles of Ar = 10/40 = .25 moles

Partial pressure of Ne = .5*1.6/.75 = 1.06 nearly equal to = 1.1 atm

The partial pressure of a gas is a measure of thermodynamic activity of the gas's molecules.

In a mixture of gases, each constituent gas has a partial pressure which is the notional pressure of that constituent gas as if it alone occupied the entire volume of the original mixture at the same temperature. The total pressure of an ideal gas mixture is the sum of the partial pressures of the gases in the mixture (Dalton's Law).

The partial pressure of a gas is a measure of thermodynamic activity of the gas's molecules. Gases dissolve, diffuse, and react according to their partial pressures but not according to their concentrations in gas mixtures or liquids. This general property of gases is also true in chemical reactions of gases in biology. For example, the necessary amount of oxygen for human respiration, and the amount that is toxic, is set by the partial pressure of oxygen alone.

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The enzymes that regulates the malonyl CoA is camitine acyltransferase.

1) citrate and fatty acids/fatty acul coa

2) camitine acyltransferase

3) high conc fatty acids in cytosol inhibits fatty acid synthesis

4) high conc malonyl coa inhibits B oxidation

Enzymes are proteins that function as biological catalysts by accelerating chemical reactions. Molecules on which enzymes can act are called substrates, and enzymes convert substrates into various molecules known as products. Almost all metabolic processes in cells require enzymatic catalysis in order to run fast enough to sustain life.

Metabolic pathways are linked to enzymes that catalyze individual steps. The study of enzymes is called enzymology, and in the field of pseudoenzymatic analysis, it is recognized that some enzymes have lost their ability to perform biological catalysis over the course of evolution. . This is often reflected in their amino acid sequence and unusual "pseudocatalytic" properties.

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When 100 grams of water and 50 grammes of potassium chloride are dissolved at 50 C, the solution can be appropriately referred to as supersaturated. If more solute is added, supersaturated solutions result.

The saturated solution To put it another way, it is the situation in a saturated solution when you add some extra solute to the solution. The prepared solution will reach saturation when it crosses the line of saturation if it is cooled. It will be supersaturated if it is previously cooled, along the saturation line to point B. This solution is oversaturated, but that does not mean it will immediately crystallize. The term "metastable" refers to supersaturated solutions.

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As increasingly solute is dissolved withinside the solvent, the concentration of the solution is going on increasing.

The osmotic pressure can be expressed as follows:

π=iCRT

With the growth in concentration of the solution, the osmotic stress of the answer increases. Thus, the osmotic stress of answer is extra than the natural solvent. As the concentration of solute is extra in an answer than in natural water, water from natural water attempts to diffuse or go through osmosis to the solution. Hence, the strain required to save you water access to the solution, i.e. osmotic strain of an answer is usually better than that of natural water or solvent.

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Two of the samples could be combined and their melting points compared to demonstrate the presence of distinct materials in the test tubes. The two substances are distinct if the melting point is lower than the theoretical melting point. They are the same substance if the melting point of the sample doesn't change.

The melting point is a solid's physical characteristic that can be used to identify a substance. In reality, a solid typically melts over a wide temperature range rather than at a single, set temperature. Because of this, speaking of a melting point range is more useful.

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Answer:

D

Explanation:

The answer to question 4) is 5.79×10^22

Bromine reacts with 2-butene to form 2,3-dibromobutane. It also reacts with 3-methyl-2-pentene to form 2,3-dibromopentane.

We can build a general rule that bromine reacts with compounds that contain a C=C double bond to give the product expected from addition across the double bond. This approach to understanding the chemistry of organic compounds presumes that certain atoms or groups of atoms known as functional groups give these compounds their characteristic properties.

Functional groups focus attention on the important aspects of the structure of a molecule. We don't have to worry about the differences between the structures of 1-butene and 2-methyl-2-hexene, for example, when these compounds react with hydrogen bromide. We can focus on the fact that both compounds are alkenes that add HBr across the C=C double bond in the direction predicted by Markovnikov's rule.

Bromine, is a chemical element in the periodic table that has the symbol Br and atomic number 35. A halogen element, bromine is a red volatile liquid at standard room temperature which has a reactivity between chlorine and iodine. This element is corrosive to human tissue in a liquid state and its vapors irritate eyes and throat. Bromine vapors are very toxic upon inhalation.

A halogen, bromine resembles chlorine chemically but is less active. It is more active than iodine, however. Bromine is slightly soluble in water, and highly soluble in carbon disulfide, aliphatic alcohols (such as methanol), and acetic acid. It bonds easily with many elements and has a strong bleaching action.

Bromine is highly reactive and is a powerful oxidizing agent in the presence of water. It reacts vigorously with amines, alkenes and phenols as well as aliphatic and aromatic hydrocarbons, ketones and acids (these are brominated by either addition or substitution reactions). With many of the metals and elements, anhydrous bromine is less reactive than wet bromine; however, dry bromine reacts vigorously with aluminium, titanium, mercury as well as alkaline earth metals and alkaline metals.

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Thickening the material involved is a way in which the rate of thermal energy transfer into the pie can be maximized.

This is referred to as the degree of hotness or coldness of a substance and it is influenced by thermal energy. It is usually measured with the use of a thermometer and the S.I unit of this type of measurement is Kelvin.

The way in which the rate of thermal energy transfer can be maximized is by thickening the material as it will ensure that the atoms are tightly packed together which permits the flow of electrons or heat between them in this scenario.

The arrangement of the atoms ensures that the thermal energy is easily absorbed and also has a relative high specific heat capacity thereby making it the correct choice.

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Time taken to deposit 0.00235 moles of gold by the electrolysis of kaucl4(aq) using a current of 0.214 amperes is  53.0 min

Note that the oxidation number of gold is +3 in the aqueous solution given. We can then determine how many moles of e- are needed.

The most common oxidation states of gold are +1 and +3. This implies it gives either 1 or 3 electrons to form stable mixtures. For instance, in AuCl3 , chloride particles have a - 1 oxidation state so gold will have Au + 3(- 1) = 0, so gold will have a +3 oxidation state.

The oxidation number or oxidation state of any atom is the capacity of that atom to gain or lose electrons. The oxidation state is the charge on an atom when it is in its ionic form, or when in a molecule. The charge is negative when an atom tends to take electrons or the atom is more electronegative, while the charge is positive when an atom has a capacity to give electrons.

As the oxidation state is determined as particles, so the oxidation state of any neutral molecule is zero. So any molecule without a charge has a 0 oxidation number. Then by adding the individual oxidation numbers we can take out the oxidation number of any component to be positive or negative.

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Continental polar (cP) or continental arctic (cA) air masses are cold, dry, and stable.

These air masses originate over northern Canada and Alaska as a result of radiational cooling.

They move southward, east of Rockies into the Plains, then eastward. air mass would show the most dramatic change in both temperature and moisture content as it moves over a large body of very warm water

What does air mass cP mean?

The same arctic air mass will pick up some of the heat from the earth if it goes south from Canada into the southern U.S., but it will stay quite dry due to a lack of moisture. A continental polar air mass is what this is (cP).

During the winter, a continental polar air mass can develop over the land. It comes from northern Canada or Alaska in the Northern Hemisphere. It transports dry weather to the United States as it goes south.

Cp. In a system, Cp is the quantity of heat energy that is emitted or absorbed by a unit mass of the substance with a change in temperature at a constant pressure. It is the transmission of heat energy between a system and its surroundings under constant pressure, to put it another way.

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Answer:500g

Explanation: 500g

Explination: no chocolete was lost in the chopping of chocolate so it remains 500g