the ph of a solution is 4.80. what is the concentration of hydroxide ions in this solution?
1.6 x 10-5 M
6.3 x 10-10 M
3.6 x 10-12 M
4.2 x 10-9 M

Answer:

I think if u will clear your topic it would be more helpful.

But if u r unable to do it, then u can just memorise it.

See, i will try to help u.

Salts are formed when acids react with bases.

and this reaction is called neutralisation reaction.

e.g. HCl+NaOH=NaCl+H2O.

It is very easy.

Other examples:

H2SO4+Mg(OH)2=MgSO4+2H2O.

There may be some other reactant with acid like u have mentioned above.

hope it helps u....

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The minimum energy required to excite a hydrogen atom from its lowest energy level is 10.2 eV.

The term excitation has to do with the promotion of an electron from a lower to a higher energy level.

In this case, we are dealing with the hydrogen atom having only one electron. Thus, the minimum energy required to excite a hydrogen atom from its lowest energy level is 10.2 eV.

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Answer:

44.01

Explanation:

12.01 + 16.00 + 16.00 = 44.01

Answer:c

Explanation:

Answer:

because the particles in solids are more close together and strong so they would support it better than fluid because fluid particles are spread out

Explanation:

Have A Wonderful Day !!

Due to properties of solid substances, they support objects easier than liquid.

Solids can support objects easier than fluids because in solid, particles are present on fix place as compared to liquid which is not fix and can move from one place to another. In Solid substances, particles are fix so they provides better support to the objects which are placed on them.

While on the other hand, in liquid substances particles are mobile so they are not considered better supporter for objects so we can conclude that due to properties of solid substances, they support objects easier than liquid.

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The way in which temperature leads to weathering of rocks is as follows: Rocks expand and contract when they are heated and cooled which cause them to break (option C).

Rock weathering is the mechanical or chemical breaking down of rocks in situ by weather or other causes.

Once a rock has been broken down, a process called erosion transports the bits of rock and minerals away. Water, acids, salt, plants, animals, and changes in temperature are all agents of weathering and erosion.

Changes in temperature cause rock to expand (with heat) and contract (with cold). As this happens over and over again, the structure of the rock weakens. Over time, the rock crumbles.

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a 0.50 liter solution of 0.10 M HF titrated to the equivalence point with a 0.10 M solution of NaOH. The final volume of the solution is 1.0 liter. The pH of the equivalence point is 5.87.

The titration of hydrofluoric acid (HF) with sodium hydroxide (NaOH) can be represented by the balanced chemical equation:

HF (aq) + NaOH (aq) → NaF (aq) + H₂O (l)

At the equivalence point of the titration, the moles of NaOH added will be equal to the moles of HF originally present in the solution. We can use the balanced chemical equation to determine the number of moles of HF in the original solution:

0.10 M HF = 0.10 mol HF / L

0.50 L HF solution contains 0.05 mol HF

Therefore, when 0.05 mol NaOH is added at the equivalence point, it will react with all the HF present in the solution to form NaF and water.

The balanced chemical equation shows that one mole of HF produces one mole of H+ ions in solution. At the equivalence point, all the HF has been neutralized, and the remaining solution contains only NaF and water. NaF is the salt of a weak acid (HF) and a strong base (NaOH), and it undergoes hydrolysis in water, which means it reacts with water to produce H+ ions and F- ions:

NaF (aq) + H₂O (l) → HF (aq) + Na+ (aq) + OH- (aq)

The Kc expression for the hydrolysis of NaF is:

Kc = [HF][Na⁺][OH⁻] / [NaF]

At the equivalence point, all the HF has been converted to NaF, so [HF] = 0 M. The initial concentration of NaF is:

0.10 M NaOH = 0.10 mol NaOH / L

0.05 L added to the HF solution

0.005 mol NaOH added

0.005 mol NaF formed

0.005 M NaF

The reaction between NaF and water produces equal amounts of H⁺ and OH⁻ ions, so [H⁺] = [OH⁻] = x M (assuming the solution is initially neutral). The concentration of Na⁺ ions is equal to the initial concentration of NaF, which is 0.005 M. Substituting these values into the Kc expression, we get:

Kc = x² * 0.005 / 0.005

Kc = x²

Taking the square root of both sides, we get:

x = sqrt(Kc)

x = sqrt(1.8 × 10⁻¹¹)

x = 1.34 × 10⁻⁶ M

At the equivalence point, the pH of the solution is given by:

pH = -log[H⁺]

pH = -log(1.34 × 10⁻⁶)

pH = 5.87

Therefore, the pH of the solution at the equivalence point is 5.87.

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Answer:

High pressure.

Explanation:

The weather should have clear skies, if it is a Large "L" it would be could be stormy.

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Answer:

alpha decay or particle

Explanation:

If the temperature of 1 kg of water in a calorimeter increases by 50oc upon the combustion of 10 peanuts, the energy content in kcal of one peanut is 209.2 kcal.

A calorimeter is a device used to measure the heat of chemical reactions and physical changes, as well as to measure the heat capacity of substances. It consists of an insulated container (usually a metal can, also known as a Dewar flask) containing a known quantity of water, and another container, usually a metal can, suspended within the water. When a reaction or physical change takes place in the container, the heat exchanged between the two containers is measured. The heat capacity of the reaction or physical change can then be calculated, as well as the energy released or absorbed during the process.

The energy content in kcal of one peanut can be calculated using the following equation: Energy (kcal) = Mass of Water (kg) x Change in Temperature (oc)× Specific Heat Capacity of Water (4.184 J/g°×C) / 1000

In this case, the energy content of one peanut is calculated as:

Energy (kcal) = \(1 kg* 50 oC* 4.184 J/g °C / 1000\)

Energy (kcal) = 209.2 kcal

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ANSWER

the volume of the solution is 2.05 liters

EXPLANATION

Given that;

The concentration of Ca(OH)2 is 0.420M

The grams of Ca(OH)2 is 64.0 grams

Follow the steps below to find the volume of the solution

Step 1; Calculate the number of moles of Ca(OH)2 using the below formula

Recall, that the molar mass of Ca(OH)2 is 74.093 g/mol

Step 2; Find the volume of the solution in liters using the below formula

Therefore, the volume of the solution is 2.05 liters

4 is the highest energy level in arsenic as the 4s and 4p subshells are found in the fourth energy level. The 4s subshell has two electrons, while the 4p subshell has three. Arsenic thus has a valence electron count of 2 + 3 = 5.

A p-block element with an atomic number of 33 is arsenic.

Arsenic is a member of group 15.

Group 15's electronic configuration:

These elements' valence shell electrical configuration is ns2np3.

These elements' electronic arrangement is exceptionally stable due to their fully filled s orbitals and partially filled p orbitals.

Arsenic's electronic configuration:

3s2 3p6 4s2 3d10 4p3 s2 2s2 2p6

In the above electron configuration, the highest energy level (4).

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Answer: D. the number of protons

Explanation: The number of protons shows you what the Atomic number of an element is on the Periodic table of elements.

The identity of an element is primarily determined by the number of protons it possesses. The Option C.

Each element on the periodic table has a unique number of protons in its nucleus which is referred to as its atomic number. This fundamental property of an element distinguishes it from other elements and determines its place on the periodic table.

While number of neutrons and electrons can vary within an element, it is the number of protons that defines its identity. Thus, the correct answer is C: the number of protons.

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C. 0.1 M barium chloride following would produce maximum elevation in boiling point

Because both the hydroxyl and carboxylic acid groups might take part in intermolecular hydrogen bonding, compound IV would have the greatest boiling point. Additionally, compound IV exhibits stronger dipole-dipole attraction due to its increased polarity (more polarized carbon-oxygen bonds).

The element with the lowest temperature at which an element would smolder is helium, while the element with the highest temperature is tungsten. The melting point is measured in degrees Celsius (C).

The most particles will be produced by BaCl2 after dissociation. Consequently, it causes the greatest rise of boiling point.

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The discovery of atomic number was most likely made between the time of Mendeleev's periodic table and Moseley's, which aided Moseley in developing his table.


Dmitri Mendeleev created the first periodic table by arranging elements in order of atomic weight in 1869. Henry Moseley's periodic table was created in 1913, about forty-four years later. The concept of atomic number was first introduced by Henry Moseley in his work on x-ray spectra in 1913. During the years between the creation of Mendeleev's and Moseley's periodic tables, there were numerous discoveries in chemistry.

Among these discoveries were radioactivity, the nature of the electron, and isotopes. However, the discovery of atomic number was critical in the development of Moseley's periodic table, which was based on the concept that each element's position in the periodic table is determined by the number of protons in the nucleus.

This approach resulted in a more precise arrangement of the elements than Mendeleev's table, which was arranged primarily based on the elements' atomic weights. As a result, the discovery of atomic number helped Moseley build his periodic table.

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Al = 13 protons, 10 electrons, 14 neutrons

S = 16 protons, 18 electrons, 17 neutrons

P = 15 protons, 18 electrons, 19 neutrons

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the following will increase the rate of dissociation of a solute in a solvent B. agitating the mixture

A solvent is a substance that dissolves a solute, resulting in an answer. A solvent is often a liquid however can also be a stable, a fuel, or a supercritical fluid.

Solvents are a heterogeneous organization of structurally numerous chemical compounds that can be used to dilute, dissolve, or disperse different compounds. The potential of a solvent to dissolve some other molecule is dependent on molecular structure and physical homes of both the solvent and the solute.

Natural solvents and inorganic solvents are two kinds of solvents. Inorganic solvents don't include the detail carbon. The maximum commonplace inorganic solvents are water, and liquid ammonia while organic solvents, which includes alcohols, glycol ethers, contain carbon and oxygen of their shape.

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Agitating the mixture(Option B) will increase the rate of dissociation of a solute in a solvent.

A solution is a special kind of homogeneous mixture of two or more substances. In such mixtures, a solute is a substance dissolved in another substance known as a solvent. If the attractive force between the solvent and solute particles is greater than the attractive force holding the solute particles together, the solvent particles will pull the solute particles apart and surround the solute particles. These enclosed solutes move away from the solid solutes and into the solution.

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Explanation:

true ..........................

Explanation :

The pH of the solution after 3.16 ml of 0.2 M LiOH have been added can be calculated as follows:

pKa of CH3CH2COOH = -log Ka= -log (1.3 × 10^-5) = 4.88

Now, the concentration of CH3CH2COOH can be calculated as follows:

Initial concentration of CH3CH2COOH = 0.1000 MC = (0.1000 M) (20.00 mL) = 0.00200 mol

Now, the amount of base added can be calculated as follows:

Amount of LiOH added = C * V= (0.2000 M) (3.16 mL / 1000 mL/L) = 0.000632 mol

The number of moles of CH3CH2COOH remaining can be calculated as follows:

Number of moles of CH3CH2COOH remaining = 0.00200 - 0.000632 = 0.00137 mol

Now, the concentration of the remaining CH3CH2COOH can be calculated as follows:

Concentration of CH3CH2COOH remaining = 0.00137 mol / 16.84 mL = 0.0814 M

Therefore, the concentration of CH3CH2COO^- can be calculated as follows:[CH3CH2COO^-] = [OH^-]= (0.000632 mol) / (20.00 mL + 3.16 mL) = 0.0151 M

Finally, the pH of the solution can be calculated as follows:

pH = pKa + log ([CH3CH2COO^-] / [CH3CH2COOH])= 4.88 + log (0.0151 / 0.0814) = 4.11

Therefore, the pH of the solution after 3.16 ml of 0.2 M LiOH have been added is 4.11.

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Student could use Thiele apparatus to determine the boiling point of substance B.

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Answer:

The answer is B. The number of atoms on each side of the reaction arrow must be the same.

Explanation:

Check your work to make certain you have the same number and type of atoms on the reactants side as on the products side

Answer:

carborane

Explanation:

Carborane acid is the strongest acid in the word. It is minimum 1 million times stronger or harder than 100% sulfuric acid with respect to Hammett acid feature

The pH value of the carborane is -18. Plus it is noncorrosive as it would be handled with bare skin

Therefore in the given case, the carborane is the strongest acid among all available ones

Among the given reagents, KCl (D) is not typically viewed as an oxidizing agent. An oxidizing agent is a substance that gains electrons in a redox reaction, causing another substance to lose electrons (i.e., be oxidized).

Oxidizing agents typically have high electronegativity and a strong tendency to gain electrons. Reagents A, B, C, and E are known as oxidizing agents. Cl₂ (A) can accept electrons and convert to Cl-, while KMnO₄ (B) contains Mn in the +7 oxidation state, which can be reduced to a lower oxidation state.

O₂ (C) is a classic example of an oxidizing agent that readily gains electrons during respiration and combustion processes. H₂O₂ (E) can also act as an oxidizing agent, accepting electrons and breaking down into water and oxygen.

However, KCl (D) is a stable ionic compound consisting of K+ and Cl- ions. Neither ion readily gains or loses electrons, so KCl does not function as an oxidizing agent in typical reactions.

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Synthesis reaction

It is a reaction in which 2 or more reactants combine with each other to form one product .

Check option C

Sulphate and water are combining to form sulfuric acid .

Hence option C is correct

Answer:

SO3 + H2O => H2SO4

Explanation:

I took the test :)

Answer:

There is a ozone layer because of the special atomphere and chemical conditions that takes place there. I think the consequences of that home area is the very low winter temperatures.

Answer:

There is a hole in the ozone layer because of the pollution on earth. Because of that the UV rays are easily entering the earth through that portion. The consequences of this can be cancers, global warming and disastrous storms.

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NADH and FADH2 are two important molecules used by the electron transport chain to transfer electrons from one molecule to another.

Molecules are the smallest unit of a substance that still retains the chemical and physical properties of the original material. A molecule is made up of two or more atoms that are held together by chemical bonds. Molecules can be composed of any combination of elements, such as carbon, hydrogen, oxygen, nitrogen, and others. Molecules can be both simple, with just two atoms, or complex, with thousands of atoms forming a single molecule. Molecules can be found in everything from the air we breathe to the food we eat. Molecules are the building blocks of life, and understanding the structure and properties of molecules helps scientists gain insight into the natural world.

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The rate constant for an elementary chemical reaction increases with temperature in general.

Consider the reaction X + Y → XY. If the temperature increases, the number of reactants with sufficient energy to react increases

A chemical reaction is a procedure that leads to the transformation of one set of chemical substances to another. The chemical substance or substances present at the beginning of the reaction is/are known as the reactant(s), while the chemical substance(s) produced as a result of the reaction is/are known as the product(s).

The effect of temperature on the reaction rate is determined by the temperature dependence of both the reaction rate constant and the reaction's activation parameters.

The rate constant for an elementary chemical reaction increases with temperature in general.

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Magnesium (Mg) is more active than calcium (Ca) in Group IIA of the periodic table.The Group IIA metal that is more active between calcium and magnesium is magnesium (Mg).

Magnesium is a chemical element with the atomic number of 12 and symbol Mg. It belongs to the Group IIA alkaline earth metals in the periodic table.

Calcium and magnesium are two of the five elements in Group IIA of the periodic table that have the most outstanding chemical properties that are critical to life.Magnesium has a strong reducing effect.

Calcium is less active than magnesium because it is harder to reduce its noble gas configuration to 0, making it less electropositive and less reactive.

Magnesium, on the other hand, has a smaller radius than calcium and is more electronegative, allowing it to lose two electrons to form an Mg2+ cation with ease.

Therefore, magnesium (Mg) is more active than calcium (Ca) in Group IIA of the periodic table.

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Answer:

The larger the highest energy level, the larger the atomic radius.

Explanation: