What state of matter is H2O above 100°C?

The elements carbon, nitrogen, hydrogen, sulfur, phosphorus, and oxygen as well as water are important in searching for life as these elements are the main components of organic water whereas water is the universal solvent dissolving these organic molecules.

The elements needed for life to exist are the elements found in organic compounds.

The elements that are found in organic compounds are:

These elements are found in the main macromolecules of life which are proteins, lipids, carbohydrates, and nucleic acids.

Another substance that is the most important substance that sustains life is water.

Water is needed for life because it is the most important solvent in which the living components of the cells are dissolved.

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The compound that is covalent is the compound A.

We know that the forces that holds the molecules of an ionic substance together is so strong that the ionic substances are known to have a high melting and a high boiling point. Thus, it is already clear that the compounds B and C are both ionic because they are highly conducting and they also have a high melting and boiling point.

The compound A has a low melting and boiling point and also does not conduct electricity. This goes to tell us that A is a covalent compound.

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Answer:

compound A

Explanation:

edge 2023

Ammonium nitrate , NH₄NO₃ dissolves spontaneously and endothermically in water because the temperature of solution decreases.  

When we add ammonium nitrate ,  NH₄NO₃ to water at 298 K , it dissolves spontaneously and the temperature of system decreases. this means the heat is absorbed by the system and when the heat is absorbed by the system the process is called as endothermic.  the ammonium nitrate when dissolve in water it will dissociates in to ions which requires the energy so heat is absorbed. this process in endothermic.

Thus, Ammonium nitrate , NH₄NO₃ dissolves spontaneously and endothermically in water because the temperature of solution decreases.

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Answer:

False for the first, true for second.

Explanation:

ATP is cellular energy and it needs to be recharged after it is used. That half dead is called adp.

The statement energy is released from ATP when it reacts with water to produce ADP is False, while the statement the information that cells need to direct their metabolic process is stored in RNA is True.

ATP is the energy source of cells generated by cellular respiration and anaerobic processes, while  RNA is a molecule obtain by the transcription process which is used to generate proteins during metabolic activities such as differentiation.

Therefore, with this data, we can see that ATP is the energy coin of cells, while cells generate RNA during transcription.

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The volume inside a deodorant can is 0.199 L.

Charles’s law applies when a fixed amount of gas is in a container and the pressure is constant if the temperature increases the volume of gas also increases. The formula

[tex]\frac{V_1}{T_1} = \frac{V_2}{T_2}[/tex]

The temperature units have to be in Kelvin. Volume units can be anything as long as both volume has the same units.

When a container is heated, the gas in it will experience a temperature increase and the volume of the gas will expand. But the expansion will not exceed the contents of the container.

[tex]\frac{V_1}{T_1} = \frac{V_2}{T_2}[/tex]

[tex]\frac{V_1}{298} = \frac{0.25}{373}[/tex]

V1 x 373 = 298 x 0.25

[tex]V_1 = \frac{74.5}{373}[/tex]

V1 = 0.199 L

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Since KCl has the highest molar mass when it is added to water, it will have the most amount, in grams, if the freezing point of each aqueous solution is the same.

An essential accumulative feature of the solution is a depression in the freezing point. This is signified by: T=Kfm. Here, the symbol for freezing point change is (T). Additionally, m is morality, and Kf is the freezing point constant. One of the matter's physical characteristics is its temperature.

1) Options list:

A. (NH₄)₂CO₃

Ionic Equation:

(NH₄)₂CO₃ → 2(NH₄)⁺ + {CO₃}⁻         [i = 3]

B. KCl

Ionic equation:

KCl → K⁺ Cl⁻          [i = 2]

D.NH₄Cl

Ionic equation:

KCl → K⁺ Cl⁻          [i = 2]

F. NaCl

Ionic equation:

NaCl → Na⁺ + Cl⁻        [i = 2]

G. CH₃OH

Ionic equation:

CH₃OH → CH₃⁺ + OH⁻             [i = 2]

H. MgCl₂

Ionic equation:

MgCl₂ → Mg² + 2Cl⁻           [i = 3]

2) Utilizing the formula

ΔT = iKᵇmsolute

ΔT = iKfmsolute

ΔT = T° - T

Here, T° is both the solution's temperature and the temperature of the pure solvent.

Suppose that T° is zero.

ΔT = 0 - T = -T

The greater negative the temperature, the lower the freezing point. The freezing point of the solution is lowered when a solute is added to the solvent. The formula states that a lower molality gives a solute the ability to be added to a greater extent and produce a smaller change in temperature.

To obtain a smaller shift in temperature, the molality should be the lowest possible. The quantity of moles of solute in one kilogram of solvent is referred to as molality.

Morality = (Number of moles / 1) * (1 / Mass of solvent in kg)

Morality = (Mass of solute / Molar Mass of solute) *  (1 / Mass of solvent in kg)

In this case, the solvent weighs 0.5 kg (constant)

Morality ∝ (Mass of solute / 1)

OR

Morality ∝ (1 / Molar Mass of solute)

With a smaller mass of a material or a larger molar mass of a solute, the molality will be lower. Only the solvent's freezing point and the solute's molar mass are under control under the given conditions. Despite the fact that KCl has a higher molar mass than (NH₄)₂CO₃, (NH₄)₂CO₃ will produce more ions at 100% dissociation than KCl. As a result, there will be fewer moles for the KCl.

The amount of KCl in grams will be the highest since it has the highest molar mass when it is added to water.

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COMPLETE QUESTION:

Six solutions are made by dissolving a certain amount of each of the six substances in 500. g water. If the freezing point of each aqueous solution is the same, which substance is added to water in the largest amount, in grams? Assume all ionic compounds dissociate 100% to form ions in the solution.

ΔT = iKbmsolute ΔT = –iKfmsolute

Select one:

A. (NH4)2CO3

B. KCl

C. The largest mass (g) of substance added is the same for two of the solutions.

D.NH4Cl

E. Insufficient information is provided.

F. NaCl

G. CH3OH

H. MgCl2

The correct answer should be "B" or KCl, but I don't understand why

The mechanism and product for the given reaction after adding acid and water in the second step will result in the production of phenylpropanol.

The missing reaction scheme of the question is attached as a picture:

As a result of the reaction between benzaldehyde with diethyl ether (Et2O) and MgBr an intermediate results. This intermediate then reacts with hydronium to produce phenylpropanol. The hydronium ion generates as a reaction between the water molecule and a strong acid. Acid donates its proton to the water molecule. This hydronium ion then donates this proton to the resulting intermediate. The complete mechanism is attached:

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Equal volumes of equimolar solutions of ammonium iodide, NH₄I, and lead (ii) acetate, Pb(CH₃COO)₂, were combined and a precipitate forms. The balanced equation is given as :

2NH₄I   +   , Pb(CH₃COO)₂   ---->  PbI₂   +   2NH₄CH₃CO₂

The ammonium iodide, NH₄I react with lead (ii) acetate, Pb(CH₃COO)₂ to form lead(II)iodide and ammonium ethanoate.  The balanced equation is given as follows :

2NH₄I        +       Pb(CH₃COO)₂   ---->  PbI₂   +        2NH₄CH₃CO₂

ammonium      lead (ii) acetate        lead(II)iodide    ammonium ethanoate

iodide

Thus, Equal volumes of equimolar solutions of ammonium iodide, NH₄I, and lead (ii) acetate, Pb(CH₃COO)₂, were combined and a precipitate forms. The balanced equation is given as :

2NH₄I   +   , Pb(CH₃COO)₂   ---->  PbI₂   +   2NH₄CH₃CO₂

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102 nm wavelength of light is emitted when the electron in a hydrogen atom relaxes from n= 3 to n= 1

∆E = - Rh × ( 1/nf² - 1/ni² )

∆E = difference in energy between final and initial energy level (J )

R = Rydberg's constant

nf = final energy level

ni = initial energy level

nf = 3, ni = 1, Rh = 2.18 × 10-¹⁸

∆E = -2.18 × 10-¹⁸ ( 1/3² - 1/1² )

= 2.18 × 0.88 × 10-¹⁸ J

∆E = 1.93 × 10-¹⁸ J

∆E = hf = hc / λ

λ = (h × c) / ∆E

= ( 6.625 × 10-³⁴ × 3 × 10⁸) / 1.93 × 10-¹⁸

= 19.878 × 10-²⁶ / 1.93 × 10-¹⁸

= 10.299× 10-⁸

= 102.99×10-⁹

= 102 nm

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For the recrystallisation step, we need 71.4ml of ethanol for the solubility of aspirin which has 100% yield.

What is solubility?

Solubility is the ability of a solute to dissolve in solvent to make a solution at a given temperature. This is because of the intermolecular forces balance between solute and solvent and change in entropy.

In 100 ml of the solution, the solubility of aspirin is 40 g. The mass of aspirin is not indicated in the problem, so it can be assumed that the mass of aspirin needed is 40 g. With this, the volume of the solution can be calculated.

Volume of the solution = 40g x 100ml/40g = 100ml

Density of aspirin = 1.4g/ml

Volume of aspirin = 40g x 1ml/1.4g = 28.57ml

Volume of ethanol = 100ml - 28.57ml = 71.4 ml

Therefore, the solubility of 40g of aspirin when yield is 100% requires 71.4ml of ethanol.

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189.8 mol of O₂ are required to react completely with 10.6 moles of butane.

An accident occurred when the Hindenburg, an airship filled with hydrogen, tried to land in New Jersey in 1937. 36 persons were killed when the airship was destroyed and the hydrogen instantly exploded in a massive explosion. The chemical process was straightforward: water was created when hydrogen and oxygen combined.

A hydrocarbon, a substance comprised only of carbon and hydrogen, is involved in numerous combustion reactions. Carbon dioxide and water are the byproducts of the burning of hydrocarbons. Since their combustion produces more amounts of heat energy, many hydrocarbons are use fuel. Gas grills frequently use propane (C3H8) as their fuel source. Propane is a gaseous hydrocarbon.

Reaction is:

C₄H₁₀ + [tex]\frac{13O_{2} }{2}[/tex] → 4CO₂ + 5H₂O

Given,

no. moles of butane = 29.2 mol

from the balanced chemical equation,

we can say that:

1 mol of C₄H₁₀ requires [tex]\frac{13}{2}[/tex] moles of O₂

29.2 mol of C₄H₁₀ requires [tex]\frac{13}{2}[/tex] × 29.2

⇒189.8 mol of O₂

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The particles that make up your body or your friend's body doesn't have a greater average kinetic energy as they are equal to them having the same temperature.

This is referred to as the energy possessed by a body by virtue of its motion while temperature is the degree of hotness or coldness of a substance.

We were told that they both have a temperature of  38 degrees Celsius which means that the particles present in both bodies have the same average kinetic energy. We should also note that the higher the temperature, the higher the average kinetic energy and vice versa.

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Super saturated solution is a term used to describe a solution that contains more solute than the saturated solution at a particular temperature.

Your solution is referred to as unsaturated if you can continue to add solute while it still dissolves. Your solution is saturated when it can no longer dissolve any more solute at a particular temperature.

A solution that, under the same circumstances, contains more dissolved solute than a saturated solution is said to be supersaturated. The link between temperature and a substance's solubility is displayed by a solubility curve.

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The electronegativity going from left to right in the periodic table increases from left to right in the row of the periodic table

electronegativity decreases down the column.

The most ionizable elements are not the most electronegative.

Electronegativity increases from left to right this is because the number of protons in the nucleus increases as you move from left to right on the periodic table. As a result, the electron affinity increases from left to right on the periodic table.

Electronegativity decreases down the group because when we move down the group  the atomic size increases and the effective  nuclear decreases

The most ionizable cannot be more electronegative as they lose their outer electrons to be ionized while electronegative gain an electron to be stable.  

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45.0 liters of hydrogen will be produced at STP.

The balanced chemical equation at STP is :

2NH₃  → N₂+3H₂

For every 2 moles of ammonia that take part in the reaction, you get 1 mole of nitrogen gas and 3 moles of hydrogen gas. When all three gases are kept under the same conditions for pressure and temperature, these mole ratios become equivalent to volume ratios, i.e. 1:3 mole ratio.

When both gases are kept under STP conditions, we will have:

[n/v]H₂=[n/v]N₂

v[H₂]=3ₓv[N₂]

Here, v[H₂]=15.0 L

∴ v[H₂]=45.0 L

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The radioactive half-life of a material is the time for both of these. Option C.

The half-life of a radioisotope is the time it takes for half of the radioisotope to decay. Certain radioisotopes have a constant half-life. It is unaffected by conditions and is independent of the initial amount of its isotope. Half-life is the time it takes for half of the radioactive atoms of a particular radionuclide to decay.

As a rule of thumb after 7 half-lives, the radiation dose is less than 1% of the original dose. The half-life is then determined from the basic definition of radioactivity as the product of the decay constant λ of the radionuclide and the number of radioactive atoms N present. Half-life is defined as The time required for half of an existing radioactive nucleus to decay. That's what it means to have a short half-life. Activity declines rapidly because many nuclei decay in a short time.

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Explanation:

Assume if its asking about molecule particle:

1 mol of AgNO3 = 6.022 x 10^23 molecules

0.75 mol of AgNO3 = 0.75 x 6.022 x 10^23

= 4.5165 x 10^23 molecules

Assume if its asking about atom particle:

AgNO3 has 5 elements

0.75 mol of AgNO3 = 0.75( 5 x 6.022 x 10^23)

= 2.2583 x 10^24 atoms

The  correct equilibrium expressions that match the given reactions are;

We know that in a chemical reaction, there is a number that shows us the extent to which the reactants have been converted into products. We know that the more the reactants are converted into products, the more this value is large and positive. On the other hand, if a lot of the reactants are not converted into products then the value would be negative and small.

This value that I have talking about is called the equilibrium constant. We can be able to obtain the equilibrium constant from the law of mass action. It is the ratio between the concentrations of the products and the reactants all raised to the power of the stoichiometric coefficients.

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The number of electrons it take to fill the mos formed from the combination of the 3s orbitals of two atoms simply is 14 electrons.

The 3s orbital possess two different spherical nodes which is highly connected with the principal quantum number. In order words, it has 2 radial nodes. Also the shape of the 3s orbital is spherical in shape.

That being said, from the context of the above given task, the number of electrons which fill the mos formed from the combination of the 3s orbitals of two atoms is fourteen electrons.

However, the electron configuration of an atom simply is the arrangement of electrons in the electron shell or orbit of the atom of that element.

In conclusion, it can be deduced from above s orbital has a maximum of two electrons and this energy increases as the orbitals increases.

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The solution has a 0.114 M molar concentration.

Using the formula, we can determine the molar concentration from the weight percentage of the solution;

CM = 10 C%w/w d/MM

Where;

Molar concentration is CM,percent concentration C%w/w,Density is d,M = molecular mass.

In place of values, we have;

CM = 10 × 0.85 × 1.0 /74.44

CM = 0.114 M

A solution is a specific kind of homogenous mixture made up of two or more components that is used in chemistry. A solute is a substance that has been dissolved in a solvent is solution , which is the other substance in the mixture.Concentration is calculated by dividing a constituent's abundance by the mixture's total volume. One can distinguish between four different sorts of mathematical descriptions: mass concentration, molar concentration, number concentration, and volume concentration.

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Ammonia as proof that nitrate was converted to ammonia in the cultivation of nitrate broth Because amino acids are produced during protein synthesis, amino acid metabolism will always exist.

Nitrifying microorganisms in the soil change ammonia into nitrates. Nitrates are taken up by plants from the soil and used to assemble proteins. Animals may consume the plant, and its biomass may be used to produce animal protein.

The process of nitrate (NO3) being used as an electron acceptor for respiration microbes results in dissimilatory nitrate reduction to ammonium (DNRA), also known as nitrate/nitrite ammonification.

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One of the regulating services provided by the ecosystem is pollination. Option B.

Ecosystem services are natural processes that are maintained by the ecosystem but which benefit man and mankind.

There are different types of services offered by the ecosystem and that benefit man immensely. These are:

The ecosystem plays a regulatory role in the pollination of plants for the benefit of mankind. Wind helps to carry pollens from the anther to the stigma of flowers. By doing so, fruits, vegetables, seeds, etc, become available for the use of man.

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Answer:

ionic bond, also called electrovalent bond, type of linkage formed from the electrostatic attraction between oppositely charged ions in a chemical compound. Such a bond forms when the valence (outermost) electrons of one atom are transferred permanently to another atom.

Explanation:

The pH of a barium hydroxide solution obtained by dissolving 0.10 grams of barium hydroxide in 250ml of water is 17.

When barium hydroxide is dissolved in water, it forms,

Ba(OH)₂ → Ba⁺ + 2OH⁻

the concentration of the hydroxide ion in the solution will be,

Molarity = Moles of solute/volume of solution

Moles of Ba(OH)₂ = 2 moles of OH⁻

So, we can write,

0.10/171.3x2 =Moles of OH⁻

Moles of OH⁻ = 0.000291 moles.

Molarity of OH⁻ solution = 0.000291 x 1000/250

Molarity/concentration of OH⁻ solution = 0.001 mol/L

pH = 14 - p[OH]

p[OH] = log[0.001]

p[OH] = -3

pH = 14+3

pH = 17

So, the pH of the solution is 17.

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Drops of the titrant will adhere to the burette's walls, thus additional solution must be diluted into the analyte to make up for this. This will result in a higher volume reading (denominator), which will lower the molarity calculation.

The titrant is a solution with a known concentration that is added to another solution in analytical chemistry to measure the concentration of a different chemical species. The standard solution, reagent, or titrant are other names for the titrant.

In contrast, the species of interest during a titration is the analyte, or titrand. The analyte concentration can be ascertained when it reacts with a titrant that has a known volume and concentration.

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Option C. The character has a mass of 85. zero kg and weighs 305 N mercury is three.59 Venus is eight.87 Earth is 9. eighty-one mars three.77: C.earth

Earth is expected to be 4.54 billion years old, plus or minus about 50 million years. Scientists have scoured the Earth looking for the oldest rocks to radiometrically date. In northwestern Canada, they determined rocks approximately four.03 billion years vintage.

The earliest existence on earth might have been just as purple as its miles green nowadays, a scientist claims. ancient microbes might have used a molecule other than chlorophyll to harness the solar rays, one which gave the organisms a violet hue. The third planet from the sun, Earth is the handiest region in the acknowledged universe shown to host existence. With a radius of 3,959 miles, Earth is the 5th largest planet in our sun machine, and it's the handiest one regarded as positive to have liquid water on its floor. Earth is also unique in phrases of monikers.

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The titrant for this exercise. suppose Ca(OH)₂ were used as the titrant, instead of NaOH. This will make the titrant twice as concentrated in hydroxide ion. the analyte will still be HC₂H₃O₂. the stoichiometry ratio of  HC₂H₃O₂ to Ca(OH)₂ is 1 : 2.

The balanced reaction of the given condition as follow :

 Ca(OH)₂   +      2HC₂H₃O₂      ------>     Ca(C₂H₃O₂)₂     +    2H₂O

from the equation it is clear that stoichiometry of Ca(OH)₂ is 1 and the stoichiometry of HC₂H₃O₂    is 2. therefore the stoichiometry ratio of  HC₂H₃O₂ to Ca(OH)₂ is 1 : 2.

Thus, The titrant for this exercise. suppose Ca(OH)₂ were used as the titrant, instead of NaOH. This will make the titrant twice as concentrated in hydroxide ion. the analyte will still be HC₂H₃O₂. the stoichiometry ratio of  HC₂H₃O₂ to Ca(OH)₂ is 1 : 2.

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The acid h₂x gives two h ions a 1.70 g sample of h₂x reacts completely with 40.0 ml of 0.450 M NaOH solution, the molar mass of h₂x is 188.8 g/M.

Volume = 40ml = 0.04 L

mass of NaOH = 0.450 M

moles of NaOH = mass × volume

                          = 0.450 × 0.04

Therefore, moles of NaOH is = 0.018

The no. of moles required in the reaction:

H₂X(aq) + 2NaOH(aq) ⎯→ Na₂X(aq) + 2H₂O(l)

Now, moles of NaOH is [tex]\frac{0.018}{2}[/tex] which is equal to 0.009

We know,

molar mass of H₂x = mass of H₂x  / moles of NaOH

                               = 1.70 / 0.009

                               = 188.88 g/M

The molar mass of H₂x  is 188.8 g/M  

Molar mass of  is defined as the mass of a substance in the gram of one mole of compound.

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