Tính [H] và [OH] của dung dịch HC1 0,1M? Tính pH của dung dịch?

The molarity of the hydrochloric acid, HCl solution given the data is 0.079 M

HCl + NaOH —> NaCl + H₂O

From the balanced equation above,

MaVa / MbVb = nA / nB

(Ma × 27.9) / (0.137 × 16.1) = 1

(Ma × 27.9) / 2.2057  = 1

Cross multiply

Ma × 27.9 = 2.2057

Divide both side by 27.9

Ma = 2.2057 / 27.9

Ma = 0.079 M

Thus, the molarity of the HCl solution is 0.079 M

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Answer:

The sun and the heat waves  or to be more educational the  infrared radiation that makes us feel the heat we do .

Hope I could help -

Sleepy~

Answer:

6

Explanation:

Balancing a chemical equation involves making sure that the number of atoms of each element on the reactant side is equal to that on the product side. For example, if there are 5 moles of carbon on the reactant side, there must be 5 moles of carbon on the product side. This is in accordance to the law of conservation of mass.

However, to do the above, we make use of coefficients i.e whole numbers placed behind the elements. According to this question, an unbalanced chemical reaction is given as follows:

Fe(OH)3 + Li2S → LiOH + Fe2S3

As observed, the number of atoms on each side of the reaction are unequal. Hence, coefficients are used to balance the equation as follows:

2Fe(OH)3 + 3Li2S → 6LiOH + Fe2S3

From the balanced equation, 6 is used as a coefficient in front of LiOH.

Answer:

ΔT = 0.843 °C

Explanation:

Given data:

Heat added = 0.484 J

Mass of water = 0.1372 g

Temperature increase = ΔT = ?

Solution:

Formula:

Q = m.c. ΔT

Q = amount of heat absorbed or released

m = mass of given substance

c = specific heat capacity of substance

ΔT = change in temperature

Specific heat capacity of water is 4.184 j/g.°C

Now we will put the values in formula.

0.484 j = 0.1372 g × 4.184 j/g.°C× ΔT

0.484 j = 0.574j/°C× ΔT

ΔT = 0.484 j / 0.574j/°C

ΔT = 0.843 °C

A block of iron forming a pool of liquid metal is correctly classified as a physical change.

This is because although the iron has changed from a solid state to a liquid state, its chemical composition has not been altered. The change is only physical in nature, and can be reversed by allowing the liquid iron to cool and solidify again.

A block of iron forming a pool of liquid metal is correctly classified as undergoing a phase transition, specifically from the solid phase to the liquid phase. This process is known as melting, and it occurs when the iron reaches its melting point (approximately 1538°C or 2800°F).

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Answer:

The answer is choice (4)

Explanation:

Laker in 5 !!!

The substance with the greatest molecular mass is I₂.

The molecular mass is the sum of the atomic masses of all atoms in a molecule

Let's calculate the molecular mass of each compound to know the greatest.

molecular mass of H₂O₂ = 2 + 32 = 34 g/mol

molecular mass of CF₄ = 12 + (19 × 4) = 12 + 76 = 88 g/mol

molecular mass of NO = 14 + 16  = 30 g / mol

molecular mass of I₂ = 127 × 2 = 254 g/mol

Therefore, the substance with the greatest molecular mass is I₂.

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The given equation Na₂O + HF-> NaF + H₂O does not satisfy the law of conservation of matter, since there are 2 sodium atoms as reactants, but only 1 sodium atom as a product.

There are certain laws that govern the chemical reactions. These laws are known as the laws of chemical combination. The law of conservation of matter states that matter is neither created nor destroyed in a chemical reaction.

The law of conservation of matter is also called the law of conservation of mass. The total mass of the products is equal to the total mass of the reactants.

According the law of conservation of matter the number of reactants and products before and after the reaction should be the same.

But here in the reaction of sodium oxide (Na₂O) with hydrofluoric acid (HF) to produce sodium fluoride (NaF) and water (H₂O) the number of Na and H atoms are not equal on both sides.

Thus the equation Na₂O + HF-> NaF + H₂O does not obey the law of conservation of matter.

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Based on the formula for calculating quantity of Heat, the student requires the mass, temperature change and the specific heat capacity of the reaction mixture.

The enthalpy change of a reaction is the amount of heat evolved or absorbed when reactant molecules react to form products.

In the use of a calorimetry to determine the enthalpy of a reaction, the law of conservation of energy is applied.

The quantity of Heat is calculated using the formula below:

Therefore, in addition to the masses of the solutions and the temperature change, the student requires the specific heat capacity of the reaction mixture.

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Typically, nitrogen atoms are composed of electrons, protons, and neutrons. an isotope of nitrogen could have more number of neutrons than usual nitrogen atom.

What is proton ?

Protons include the H+ ion or the hydrogen atom's nucleus. Regardless of the isotope, each hydrogen atom has one proton, each helium atom has two, each lithium atom has three, and so on.

What is electron ?

It is possible for an electron to be free or linked to an atom. An electron is a negatively charged subatomic particle (not bound). There are three main types of particles in an atom: protons, neutrons, and an electron that is bonded to an atom. The nucleus of an atom is composed of protons, neutrons, and electrons.

Therefore, nitrogen atoms are composed of electrons, protons, and neutrons. an isotope of nitrogen could have more number of neutrons than usual nitrogen atom.

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Answer:

the answer is  potassium

Explanation:

Potassium has only one valence electron. ... Whereas, calcium has two valence electrons, so it requires more energy for the removal of a valence electron. Due to this potassium is more reactive than calcium.

When a reaction has reached equilibrium with a given set of conditions, if the conditions are not changed, the reaction will remain at equilibrium forever. The forward and reverse reactions continue at the same equal and opposite rates and the macroscopic properties remain constant.

It is possible, however, to disturb that equilibrium by changing conditions. For example, you could increase the concentration of one of the products, or decrease the concentration of one of the reactants, or change the temperature. When a change of this type is made within a reaction at equilibrium, the reaction is no longer in equilibrium. When you alter something in a reaction at equilibrium, chemists say that you put stress on the equilibrium. When this occurs, the reaction will no longer be in equilibrium and the reaction itself will begin changing the concentrations of reactants and products until the reaction comes to a new position of equilibrium. How a reaction will change when a stress is applied can be explained and predicted. That is the topic of this section.

For a  concentration of  is initially 0.150 M before it proceeds to equilibrium, the equilibrium concentration of B  is mathematically given as

x=3.0*10^{-7}m

Generally, the equation for the  change in Gibbs free energy   is mathematically given as

dG=-RTInK

Therefore

31.5*10*^{3}=-(8.314)(298)(ink)

K=3*10^(-6)

Eqution

A--->B

K=x/0.1-x

x=3.0*10^{-7}m

In conclusion, the equilibrium concentration

x=3.0*10^{-7}m

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The product of the reaction between an ester and a Grignard reagent followed by protonation with \(H_3O^+\) would be a tertiary alcohol.

Without a specific reaction scheme, it is difficult to provide an answer with certainty. However, in general, the reaction of an ester with a Grignard reagent (RMgX) followed by protonation with \(H_3O^+\) can result in the formation of a tertiary alcohol.

The reaction proceeds via nucleophilic addition-elimination mechanism in which the Grignard reagent adds to the carbonyl carbon of the ester to form an alkoxide intermediate. The intermediate then undergoes protonation by \(H_3O^+\) to form an alcohol.

For example, if we consider the reaction between ethyl acetate and ethylmagnesium bromide followed by protonation with \(H_3O^+\), the product would be tertiary butyl alcohol (2-methyl-2-propanol).

The reaction scheme is as follows:

1: Formation of the Grignard reagent

R-MgX + Ether → R-MgX•Ether

2: Addition of the Grignard reagent to the ester

R-MgX•Ether + R'COOR'' → R'-R''O-MgX•Ether

3: Hydrolysis of the alkoxide intermediate with \(H_3O^+\)

R'-R''O-MgX•Ether + \(H_3O^+\) → R'-R''OH + MgXOH + Ether

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Answer:

the answer is b. 0.452L.

Answer:

0.452L is the answer

Explanation:

DMSO and deuterated chloroform are the most widely solvents used in NMR spectroscopy.

DMSO is the most widely used organic solvent in the NMR analysis due to its wide range of solvent constraints as well as its simple spectrum and having high boiling point. The reaction of the organic compounds with heavy water in the presence of a suitable catalyst which is used to produce deuterium solvents.

Deuterated chloroform, also called as chloroform-d, is the organic compound having formula C₂HCl₃ or CDCl₃. Deuterated chloroform is commercially available. It is easily produced and less expensive than to the deuterated dichloromethane. It is produced by the reaction of hexachloroacetone with deuterium oxide, using pyridine as a catalyst.

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Answer:

P(total) = 164 mmHg

Explanation:

Given data:

Partial pressure of helium = 77 mmHg

Partial pressure of nitrogen = 87 mmHg

Total pressure of flask = ?

Solution:

According to Dalton law of partial pressure,

The total pressure inside container is equal to the sum of partial pressures of individual gases present in container.

Mathematical expression:

P(total) = P₁ + P₂ + P₃+ ............+Pₙ

Now we will solve this  problem by using this law.

P(total) = P(He) + P(N₂)

P(total) =  77 mmHg + 87 mmHg

P(total) = 164 mmHg

Answer:

Chromosomes are structures within cells that contain a person's genes.

Explanation:

Genes are segments of deoxyribonucleic acid (DNA) that contain the code for a specific protein that functions in one or more types of cells in the body. Chromosomes are structures within cells that contain a person's genes. Genes are contained in chromosomes, which are in the cell nucleus.

Answer:

c is the answer

step by step explanation is not

The formula which represent a hydrocarbon with a double covalent bond is C₂H₄.

Hence, option D is correct answer.

A double covalent bond is a type of covalent bond which involves the sharing of two pairs of electrons.

A covalent bond is a type of chemical bond that involves the sharing of electron pairs between the atoms.

Now lets check all options one by one

Option (A): CH₃Cl

In CH₃Cl carbon has 4 valence electrons and carbon shares its 1 electron each with three hydrogen atoms and carbon shares its 1 electron with chlorine. Here bonds are formed due to sharing of electrons between the atoms. Hence CH₃Cl is covalent bonded.

So, it is incorrect option.

Option (B): C₂H₃Cl

In  C₂H₃Cl, here two carbon atoms form double bond but they not form covalent bond.

So it is incorrect option.

Option (C): C₂H₂

In C₂H₂, each carbon has 4 valence electrons and each carbon shares its   one electron with each hydrogen atom here two carbon atoms are triple bonded.

So, it is incorrect option.

Option (D): C₂H₄

In C₂H₄, there are two carbon atoms and two hydrogen atoms, here two carbon atoms are double bonded.

So, it is correct option.

Thus, from above conclusion we can say that The formula which represent a hydrocarbon with a double covalent bond is C₂H₄.

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Answer:

A)-4.00 M/min

Explanation:

hope it helps

The mass of 9.8 × 10²³ formula units of zinc chlorate is 378.15 grams.

The mass of a substance can be calculated by multiplying the number of moles by its molar mass as follows:

mass = molar mass × no of moles

According to this question, the formula units of zinc chlorate is 9.8 × 10²³ formula units. The moles can be calculated as follows:

moles = 9.8 × 10²³ formula units ÷ 6.02 × 10²³

moles = 1.63 moles

mass = 1.63 moles × 232.29 g/mol = 378.15 grams.

Therefore. 378.15 grams is the mass of the zinc chlorate.

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(a) Rate = k[2-bromo-2-methylpropane]. (b) Mechanism: Nucleophilic attack of OH- on 2-bromo-2-methylpropane; Rate-determining step: nucleophilic substitution . (c) SN1 mechanism. (d) 2-iodo-2-methylpropane has a weaker carbon-iodine bond, allowing for faster reaction. (e) The kinetic path would involve an SN2 mechanism, with direct attack of OH- on 1-bromobutane.

(a) The rate equation for the reaction is: Rate = k[2-bromo-2-methylpropane]^1[OH-]^0, which simplifies to Rate = k[2-bromo-2-methylpropane].

(b) The mechanism consistent with the rate equation involves a single step: the nucleophilic attack of the hydroxide ion (OH-) on the 2-bromo-2-methylpropane molecule, leading to the formation of the product. This step is the rate-determining step because it involves the breaking of a strong carbon-bromine bond.

(c) This type of mechanism is called the unimolecular nucleophilic substitution (SN1) mechanism, where the rate of the reaction depends on the concentration of only one reactant.

(d) The reaction with 2-iodo-2-methylpropane proceeds at a faster rate compared to 2-bromo-2-methylpropane because the carbon-iodine bond in 2-iodo-2-methylpropane is weaker than the carbon-bromine bond in 2-bromo-2-methylpropane. Weaker bonds are easier to break, allowing the reaction to occur more quickly.

(e) If 1-bromobutane is used instead of 2-bromo-2-methylpropane, the kinetic path of the reaction would involve an Sn2 (bimolecular nucleophilic substitution) mechanism. In this mechanism, the hydroxide ion (OH-) would directly attack the 1-bromobutane molecule, leading to the displacement of the bromine atom and the formation of the product. This mechanism occurs in a single step and does not involve any intermediate species.

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To increase the solubility of oxygen in water, you would need to increase the partial pressure of oxygen (P.O2) while keeping the external pressure (P.ext) constant. Thus, option (A) is the correct choice.

According to Henry's law, the solubility of a gas in a liquid is directly proportional to its partial pressure. By increasing the partial pressure of oxygen, more oxygen molecules will be available to dissolve into the water. This results in a higher concentration of dissolved oxygen in the water.

In contrast, options (B), (C), and (D) would not lead to an increase in oxygen solubility. Decreasing the partial pressure of oxygen (B) or increasing the external pressure (C) would cause a reduction in the available oxygen molecules, resulting in lower solubility. Similarly, decreasing the external pressure (D) would not affect the solubility of oxygen since the partial pressure remains constant.

Therefore, the most effective way to increase the solubility of oxygen in water is by increasing the partial pressure of oxygen while keeping the external pressure constant.

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If 33.98 g of potassium react with excess water, the theoretical yield of potassium hydroxide is 92.4 g.

The balanced chemical equation for the reaction between potassium and water is:

2 K + 2 H₂O → 2 KOH + H₂

From the equation, we can see that 2 moles of potassium reacts with 2 moles of water to produce 2 moles of potassium hydroxide and 1 mole of hydrogen gas.

The molar mass of potassium is 39.10 g/mol, and the molar mass of potassium hydroxide is 56.11 g/mol.

To find the amount of potassium hydroxide produced, we need to use stoichiometry and the given amount of potassium:

33.98 g K × (1 mol K / 39.10 g K) × (2 mol KOH / 2 mol K) × (56.11 g KOH / 1 mol KOH) = 92.4 g KOH

Therefore, 92.4 grams of potassium hydroxide will be produced when 33.98 grams of potassium react with water.

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Answer:

The blanks can be completed with words in the following sequence

1) elements

compound

2) atom

3) matter

4) compound

5) chemistry

6) reactants

product

Explanation:

In H2SO4, atoms of hydrogen, sulphur and oxygen represent different elements that are combined to form the compound.

The smallest indivisible unit of matter that still retains all the properties of matter is an atom. Matter is anything that has weight and occupy space.

Atoms combine in fixed ratios to form compounds. Chemistry studies matter scientifically and pays specific attention to the changes that matter undergoes.

Considering the reaction of photosynthesis, water and carbon dioxide combine to give glucose so the water and carbon dioxide  are reactants while the glucose is the product of the reaction.

Answer:

See Explanation

Explanation:

We must remember that when a constraint such as a change in concentration, pressure or temperature is imposed on a reaction system in equilibrium, the equilibrium position will shift in such as way as to cancel the constraint.

If more of A or more of B is added to the system, the equilibrium position will shift towards the right and the solution becomes clear and colorless.

If C is added to the system, the equilibrium position will shift towards the left and the solution colour turns blue.

If A is removed from the system, the equilibrium position is shifted towards the left and the solution once again turns blue.

If C is removed from the system, the equilibrium shifts towards the right and the solution turns clear and colorless

The following statements on HPLC modes are true is more polar compounds elute first in normal-phase HPLC (Option E).

The liquid chromatography (HPLC) is a technique in analytical chemistry employed for the separation, identification, and quantification of elements. It is considered a highly sensitive method, and it works by separating the components in a mixture with the assistance of a solvent under high pressure.

There are two modes of HPLC: Reversed-Phase HPLC (RP-HPLC) and Normal-Phase HPLC (NP-HPLC). In RP-HPLC, a nonpolar stationary phase, such as C18, is used, and polar solvents, such as water, are used as mobile phases. Polar stationary phases, such as silica gel, are used in NP-HPLC, while nonpolar solvents, such as hexane, are used as mobile phases.

More polar compounds have a greater affinity for the polar stationary phase than less polar compounds, which have a higher affinity for the nonpolar mobile phase in NP-HPLC. As a result, less polar compounds elute first in normal-phase HPLC.

Thus, the correct option is E.

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Answer: C

Explanation: Because I just did the test lol.

Chemicals are substances that can be natural or man-made. It can both hurt and help the environment as they pollute water and can also clean water. Thus, option C is correct.

Chemicals are compounds that are synthesized artificially and have various uses and applications in various fields. They can be both beneficial and detrimental to the environment and the ecosystem.

Chemicals like that from factories, pesticides run-off from agricultural fields, drugs, microorganisms, fertilizers, radioactive substances, etc, cause water pollution by acting as contaminants.

On the contrary, chemicals can be used to clean water pollution. Chloramine and chlorine are the most common chemical disinfectants that cleanse contaminated water to make it useful.

Therefore, option C. chemicals can both clean and pollute water.

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