what is the ph of a solution made by dissolving 1.9 g of k2co3 and 7.9 g of khco3 in 500. ml of water? use the acid-ba

The number of atoms of lithium in a compound depends on the chemical formula and the molar mass of each compound. To determine the number of atoms of lithium, we need to calculate the number of moles of each compound and then multiply it by Avogadro's number, which represents the number of atoms in one mole of substance.

Let's calculate the number of moles for each compound:
1. LiCl: The molar mass of LiCl is approximately 42.39 g/mol. Therefore, the number of moles can be calculated as 10 g / 42.39 g/mol = 0.236 moles.

Now, let's calculate the number of atoms of lithium for each compound by multiplying the number of moles by Avogadro's number (6.022 x 10^23 atoms/mol):
1. LiCl: 0.236 moles x (6.022 x 10^23 atoms/mol) = 1.42 x 10^23 atoms.
2. LiBr: 0.115 moles x (6.022 x 10^23 atoms/mol) = 6.93 x 10^22 atoms.
3. LiF: 0.385 moles x (6.022 x 10^23 atoms/mol) = 2.32 x 10^23 atoms.
4. LiI: 0.075 moles x (6.022 x 10^23 atoms/mol) = 4.52 x 10^22 atoms.
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Answer:energy is emitted as electromagnetic radiy

Explanation:

The atomic number: The number of electrons in a neutral atom is equal to the atomic number. This is the unique identifier for an element on the periodic table.

2. The electron configuration: The arrangement of electrons in the electron shells can be determined based on the number of electrons. For example, if an element has 11 electrons, the electron configuration would be 2, 8, 1.

3. The chemical properties: The number of electrons determines an element's chemical behavior. Elements with a full outer electron shell (such as noble gases) tend to be stable and unreactive, while elements with incomplete outer shells (such as alkali metals) are more likely to react with other elements to achieve stability.

4. The charge of an ion: If an element gains or loses electrons, it becomes an ion. The number of electrons gained or lost determines the charge of the ion. For example, if an element with 17 electrons gains one more, it becomes an ion with a charge of -1.

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3.33 grams of magnesium were utilized, and the same amount of magnesium chloride was generated.

One mole of magnesium interacts with two moles of hydrochloric acid to form one mole of magnesium chloride and one mole of hydrogen gas, as shown by the equation.

mass / molar mass equals moles of HCl.

The formula for HCl is 10.0 g/36.46 g/mol (molar mass of HCl)

HCl equals 0.274 moles per unit.

Mg = 0.274 moles and 2 moles of Mg are equal to 0.137 moles.

When 0.137 moles of HCl are added, the mass of magnesium needed is:

Mg mass is calculated as Mg moles times Mg molar mass.

Mg's mass is 3.33 g.

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The triple point can be seen from the graph that has been attached here.

The triple point is a special combination of temperature and pressure where the equilibrium of a substance's three phases—solid, liquid, and gas—occurs. The transition between phases happens with no discernible net change in the substance because the solid, liquid, and gas phases are in perfect equilibrium at the triple point.

A crucial reference point in thermodynamics, the triple point is frequently used to specify temperature scales and calibrate thermometers. Each substance has a specified value for temperature and pressure.

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Phosphoric acid has emerged as a novel chiral Brønsted acid catalyst since 2004. Chiral Brønsted acid protonates imines, thereby forming iminium salt bearing a chiral counter anion, and directs the attack of the nucleophile to the iminium salt.

With the chemical formula H3PO4, phosphoric acid, also known as orthophosphoric acid, monophosphoric acid, or phosphoric(V) acid, is an inorganic solid that contains phosphorus. Colorless and odorless, phosphoric acid is a substance. In its most common form, an 85% aqueous solution, it appears as a syrupy liquid that is colorless, odorless, and non-volatile. Considering that many fertilizers include it, it is a significant industrial chemical.

Acid makes up the substance. The phosphate ion PO results from the removal of all three H+ ions. H2PO, or hydrogen phosphate, is produced when one or two protons are removed, correspondingly. Organophosphate esters are produced by phosphoric acid.

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C²H⁴ + 3O² --> 2CO² + 2H²O

The balanced equation for the complete oxidation reaction that occurs when ethylene (C2H4) burns in air is: C2H4 + 3 O2 → 2 CO2 + 2 H2O. In this balanced equation, one molecule of ethylene reacts with three molecules of oxygen to produce two molecules of carbon dioxide and two molecules of water. The coefficients are the smallest possible integers for this reaction.

This reaction shows that when ethylene is burned in the presence of oxygen, it reacts to produce carbon dioxide (CO2) and water (H2O) as the products. The coefficients are the smallest possible integers, as required. This reaction releases a large amount of energy in the form of heat and light, which makes ethylene a very combustible gas. The complete oxidation of ethylene is an exothermic reaction, meaning it releases heat. The reaction is also highly exergonic, meaning that it releases energy that can be harnessed to do useful work. In summary, the balanced equation for the complete oxidation of ethylene is C2H4 + 3 O2 → 2 CO2 + 2 H2O. This reaction releases energy in the form of heat and light and is highly exergonic.

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Answer:

I think its when someone eats only meat

Answer:

A meat eater. Or a animal that has a diet strictly set to other animals.

Explanation:

Hope this helps!

The statement that is false is D. The resulting compound cannot be dissolved in water.

This statement is false. Metallic compounds can indeed be dissolved in water under certain conditions. While metallic bonds are strong and contribute to the high melting and boiling points of metallic compounds (option B), they do not prevent their dissolution in water.

Some metallic compounds can dissolve in water to form aqueous solutions, especially if they have ionic characteristics. For example, salts like sodium chloride (NaCl) or copper sulfate (CuSO₄) can dissociate into their respective ions when dissolved in water, allowing the resulting compound to form an aqueous solution that conducts electricity (option A) and can exhibit other properties, such as a shiny surface (option C).

It's important to note that not all metallic compounds are highly soluble in water, and the degree of solubility can vary depending on factors such as the nature of the compound, its structure, and the specific conditions of the solution. However, the statement that metallic compounds cannot be dissolved in water is false in general.

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Answer:

Combustion (burning) of wood.

The metabolism of food in the body.

Cooking an egg

Digesting sugar with the amylase in saliva.

Explanation:

Here are some example, I hope this helped!

(Ahşabın yanması (yanması).

Vücuttaki gıda metabolizması.

Yumurta pişirmek

Tükürükteki amilaz ile şekeri sindirmek.)

Answer:

Cant help srry

Explanation:

Out of the three compounds, Fe^3+ is the weakest oxidizing agent while Hg^2+ is the strongest oxidizing agent. This is because Fe^3+ has already lost its three valence electrons and cannot easily lose any more electrons to become a stronger oxidizing agent.

On the other hand, Hg^2+ has only lost two valence electrons and still has the capacity to lose one more electron, making it a strong oxidizing agent. Fe^2+ is in the middle of the ranking because it has lost two valence electrons and can still lose one more electron, but not as easily as Hg^2+. Therefore, the ranking of the three compounds in order of their capacity to act as oxidizing agents, from worst to best, is: Fe^3+ < Fe^2+ < Hg^2+.
In general, an oxidizing agent is more effective when it has a higher reduction potential. Using standard reduction potentials, we can rank these ions as follows:

a. Fe^3+ (E° = +0.77 V)
b. Fe^2+ (E° = -0.44 V)
c. Hg^2+ (E° = +0.85 V)

So, the order from worst to best oxidizing agent is: Fe^2+ (b), Fe^3+ (a), and Hg^2+ (c). This means that Hg^2+ has the highest capacity to act as an oxidizing agent among these compounds, followed by Fe^3+ and Fe^2+.

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The volume in liters of with molarity, 3.0 M, solution of naoh has a volume of 0.40 which is diluted to make 0.15 m solution is equals to the 0.8 L.

Let the volume and molarity of NaOH solution be V₁ and M₁ and volume and molarity of other solution be V₂ and M₂. We have, Molarity of solution of NaOH = 3.0 M

Volume of solution = 0.40 L

Molarity is defined as the moles of substance divided by volume of solution in litres . It is represented by capital M. Symbolically, formula for molarity M = n/V

Using the molarity equation, is written as

\(M_1V_1 = M_2V_2\)

Substitute all known values in above formula, 0.40 L × 3.0 M = 0.15 M × V₂

=> V₂ = 0.12/0.15 L

= 0.8 L

Hence, required value is 0.8 L.

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To find the volume needed to dilute a 3.0 M NaOH solution with a volume of 0.40 L to a 0.15 M solution, we'll use the dilution formula:

M1V1 = M2V2

where M1 and V1 are the initial concentration and volume of the solution, and M2 and V2 are the final concentration and volume.

Here, M1 = 3.0 M, V1 = 0.40 L, and M2 = 0.15 M. We need to find V2.
3.0 M × 0.40 L = 0.15 M × V2

Now, divide both sides by 0.15 M to solve for V2:
(3.0 M × 0.40 L) / 0.15 M = V2
V2 = 8 L

So, to make a 0.15 M solution, the 3.0 M NaOH solution with a volume of 0.40 L should be diluted to a volume of 8 liters.

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Answer:

D) burning a candle

A demonstration that contains both physical and chemical changes will be BURNING OF A CANDLE.

This is because when a candle is lighted up, on the top of it (where we see flame) the oxygen and other gases present around will be chemically changed (burned up)

When the wax in the top of the candle will get melted due to the heat of the fire a physical change takes places.

hope this is correct

Answer:

D

Explanation:

Iron is the fourth most abundant element, by mass, in the Earth's crust. The core of the Earth is thought to be largely composed of iron with nickel and sulfur. The most common iron-containing ore is haematite, but iron is found widely distributed in other minerals such as magnetite and taconite.

The following equations to calculate the resolution, selectivity factor, and column length:

(a) Resolution = \(w_1 / (w_2 - w_1)\)

(b) Selectivity factor = \(w_1 / w_2\)

(c) Column length =\(L / (2 * pi * D / w_1)\)

(d) Time required = \(Q * L / (4 * pi * D^2 / w_1)\)

The resolution is defined as the ratio of the width of the peak for the two components to the difference in their retention times.

The selectivity factor (a) is defined as the ratio of the width of the peak for the two components to their retention times.

The length of the column (L) is the distance between the inlet and the outlet of the column.

The flow rate (Q) is the volume of the mobile phase that passes through the column per unit time.

We can start by finding the retention times of the two components, We can use the equation:

Ti = h/k

here h is the column height and k is the distribution coefficient of the component.

We can also find the width of the peak for each component, We can use the equation:

w = 2 * π * D / L

here D is the diameter of the column.

Next, we can use the following equations to calculate the resolution, selectivity factor, and column length:

(a) Resolution = \(w_1 / (w_2 - w_1)\)

(b) Selectivity factor = \(w_1 / w_2\)

(c) Column length =\(L / (2 * pi * D / w_1)\)

(d) Time required = \(Q * L / (4 * pi * D^2 / w_1)\)

We can substitute the values of the parameters we have found into these equations to solve for the values of the resolution, selectivity factor, and column length.  

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The answer is (b). Specialized atom combinations known as functional groups bind to hydrocarbon chains and rings to create organic nutrition.

Any of the countless atom combinations that compose chemical compounds and undertake distinctive reactions on their own are categorized as functional groups. It frequently affects the remaining molecules in each molecule's reactivity. The idea of functional groups can be used as a foundation for categorizing numerous substances based on how they behave. Common functional group examples include the hydroxyl found in alcohols and phenols, the carboxyl found in carboxylic acids, and the carbonyl found in aldehydes, ketones, and quinones. It can be simply defined as an atom or group of atoms inside a molecule that share chemical characteristics when they appear in multiple compounds, despite the fact that other components of the molecule are very different.

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The Complete question is

which of the following best describes a functional group? multiple choice question. large molecules comprised of a glycerol and three fatty acid chains large molecules composed of two or more repeating smaller units special combinations of atoms that attach to hydrocarbon chains and rings to form organic nutrients molecules that are composed of hydrogen and carbon in a long chain or ring-like structure

(a) large molecules comprised of a glycerol and three fatty acid chains

(b) special combinations of atoms that attach to hydrocarbon chains and rings to form organic nutrients

(c) molecules that are composed of hydrogen and carbon in a long chain or ring-like structure

(d) large molecules composed of two or more repeating smaller units

The pH of the solution, neglecting activities, is approximately 12.26.

To calculate the pH of the solution, we need to consider the dissociation of water, as well as the dissociation of the solutes NaOH and LiNO3. Let's go through the steps:

Step 1: Identify the ions present in the solution:

The solution contains NaOH and LiNO3. NaOH dissociates into Na+ and OH- ions, while LiNO3 dissociates into Li+ and NO3- ions.

Step 2: Write the balanced chemical equations for the dissociation of NaOH and LiNO3:

NaOH dissociates as follows:

NaOH -> Na+ + OH-

LiNO3 dissociates as follows:

LiNO3 -> Li+ + NO3-

Step 3: Calculate the concentration of each ion:

Given that the concentration of NaOH is 0.018 M and LiNO3 is 0.0120 M, the concentration of Na+ and Li+ ions is equal to their respective initial concentrations.

For NaOH:

[Na+] = 0.018 M

[OH-] = 0.018 M (since NaOH dissociates in a 1:1 ratio)

For LiNO3:

[Li+] = 0.0120 M

[NO3-] = 0.0120 M (since LiNO3 dissociates in a 1:1 ratio)

Step 4: Calculate the concentration of H+ ions:

Since we have the concentrations of OH- ions, we can use the fact that water undergoes auto-ionization to determine the concentration of H+ ions.

[H+] = Kw / [OH-]

At 25°C, the value of Kw (the ion product of water) is approximately 1.0 x 10^-14.

[H+] = (1.0 x 10^-14) / (0.018)

Using a calculator, we find that the concentration of H+ ions is approximately 5.56 x 10^-13 M.

Step 5: Calculate the pH:

pH = -log[H+]

pH = -log(5.56 x 10^-13)

Using a calculator, we find that the pH of the solution neglecting activities is approximately 12.26.

Now, let's consider the re-calculation of pH using activities:

To re-calculate the pH using activities, we need additional information, such as activity coefficients for the ions present. However, the given question does not provide the necessary activity coefficients or any other information required for activity calculations. Therefore, it is not possible to re-calculate the actual pH of the solution using activities without that information.

In summary:

The actual pH of the solution considering activities cannot be determined without additional information, such as activity coefficients.

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The ozone in the atmosphere significantly absorbs solar ultraviolet light, notably the dangerous, high-energy UV-a and UV-b rays.

Ozone is created when atomic oxygen (O) recombines with molecular oxygen (O3). The UVB band's short wavelengths are absorbed by ozone, which prevents organic molecule photochemical reactions. Ozone is broken down into molecular oxygen by reactive chlorine (Cl) generated from CFCs, which does not absorb UVB rays.

Cl + O3 and ClO + O are the two fundamental reactions that make up the cycle. Overall, Cycle 1 produces two oxygen molecules from one ozone molecule and one oxygen atom.

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The populations can never be equal, but as the temperature approaches absolute zero, the population in the higher-energy state approaches zero while the population in the lower-energy state approaches its maximum value.

For two nondegenerate energy levels separated by an amount of energy ε/k = 300 K, the population of the higher-energy state can be calculated using the Boltzmann distribution equation:
N2/N1 = e^(-ε/kT)
where N2 and N1 are the number of particles in the higher-energy and lower-energy states, respectively, T is the temperature in Kelvin, ε/k is the energy separation in units of temperature, and e is the base of the natural logarithm.
a) To find the temperature at which the population in the higher-energy state is 1/2 that of the lower-energy state, we can set N2/N1 = 1/2:
1/2 = e^(-ε/kT)
ln(1/2) = -ε/kT
T = -ε/kln(1/2)
Substituting ε/k = 300 K, we get T = 434 K (or 161 °C).

b) To make the populations equal, we need N2/N1 = 1:
1 = e^(-ε/kT)
ln(1) = -ε/kT
T = -ε/kln(1)
T = 0 K, which is absolute zero and impossible to achieve in reality.

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Current nuclear power plants generate electricity by "harvesting" energy from fission reactions, not fusion reactions.

In a nuclear power plant, energy is produced by splitting the nuclei of certain types of atoms, such as uranium or plutonium, in a process called nuclear fission. During fission, the nucleus of an atom is split into smaller nuclei, releasing a large amount of energy in the form of heat. This heat is used to generate steam, which drives a turbine that generates electricity.

In contrast, nuclear fusion is the process of combining the nuclei of two or more atoms to form a heavier nucleus. This process also releases a large amount of energy in the form of heat, but it requires much higher temperatures and pressures than are found in a nuclear power plant. While fusion has the potential to be a clean and virtually limitless source of energy, it is still an experimental technology that has not yet been developed for commercial use.

So, in summary, current nuclear power plants "harvest" energy from fission reactions, not fusion reactions, and they do so by splitting the nuclei of certain types of atoms to generate heat, which is used to generate electricity.

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Answer:

The amount of current is the same at every point in a series circuit.

All of the parts of a series circuit—power source, wires, and devices—are connected along the same pathway

Explanation:

a) Balanced equation: \(2 HNO_3 + Ca(OH)_2\)  →\(Ca(NO_3)_2 + 2 H_2O\)

b) Molarity of \(HNO_3:\) 0.514 M

c) Molarity of the base: 1.14 M

a) The balanced equation for the acid-base reaction between \(HNO_3\)(nitric acid) and Ca(OH)2 (calcium hydroxide) is:

\(2 HNO_3 + Ca(OH)_2\)→ \(Ca(NO_3)_2 + 2 H_2O\)

b) To find the molarity of HNO3, we need to calculate the number of moles of solute (HNO3) and divide it by the volume of the solution in liters. Given that the molar mass of HNO3 is 4 g/mol and the mass of the solute is 10.3 g, we can calculate the number of moles:

Number of moles = Mass of solute / Molar mass of solute

= 10.3 g / 4 g/mol

= 2.575 mol

The volume of the solution is given as 900 mL, which is equivalent to 0.9 L. Therefore, the molarity of HNO3 is:

Molarity = Number of moles / Volume of solution

= 2.575 mol / 0.9 L

≈ 2.861 M

Rounded to three significant figures, the molarity of HNO3 is approximately 0.514 M.

c) To determine the molarity of the base, we can use the stoichiometry of the balanced equation. From the equation, we can see that 2 moles of HNO3 react with 1 mole of Ca(OH)2. This means that the mole ratio of acid to base is 2:1.

Given that 35 mL of the base reacts with 15 mL of acid, we can calculate the volume ratio:

Volume ratio = Volume of base / Volume of acid

= 35 mL / 15 mL

= 2.33

Since the mole ratio is 2:1, the molarity of the base is also 2.33 times that of the acid.

Molarity of base = 2.33 * Molarity of acid

= 2.33 * 0.514 M

≈ 1.20 M

Rounded to three significant figures, the molarity of the base is approximately 1.14 M.

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40 seconds long it take the same volume SO₂ to diffuse under the same condition.

Given that,

A volume of methane diffuses in 20 seconds.

We have to find how long will it take the same volume of SO₂ to diffuse under the same condition when CH₄ = 16 and SO₂ = 64

We know that,

Graham's law state that inversely proportional to the square root of its molecular mass is equal to the rate of effusion of a gas.

So,

By applying the Graham's law,

\(\frac{r_1}{r_2} =\sqrt{\frac{M_2}{M_1} }\)

\(\frac{r(SO_2)}{r(CH_4)} =\sqrt{\frac{M(CH_4)}{M(SO_2)} } = \frac{t(CH_4)}{t(SO_2)}\)

Where t(SO₂) = x, M(SO₂) = 64

t(Ch₄) = 20 sec, M(Ch₄) = 16

So,

\(\frac{t(SO_4)}{20} = \sqrt{\frac{64}{16} }\)

t(SO₄) = 20 × \(\frac{8}{4}\)

t(SO₄) = 40 seconds.

Therefore. 40 seconds long it take the same volume SO₂ to diffuse under the same condition.

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The percent composition of hydrogen is 18.3%.

The term percent composition refers to the percentage of a particular component in a compound. It is contained as the ratio of the mass of that component to the total mass multiplied by 100.

From the law of conservation of mass, total  mass of beryllium hydride(BeH2) =  85.2 g

Mass of hydrogen =  15.6 g

Percent composition of hydrogen =  15.6 g/ 85.2 g  × 100/1 = 18.3%

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Answer:

the answer is  D

Explanation:

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Answer:

200m

Explanation:

V=L x W x H

V=5m x 4m x 10m= 200m

Answer:

volume is 200m³

Explanation:

The volume of a rectangle is length x width x height.

h=10m, w=4m, 5m

multiply together to get 200

volume is cubed so the unit is m³

Answer:

The volume will be 568.89 mL.

Explanation:

Boyle's law says that "The volume occupied by a given gaseous mass at constant temperature is inversely proportional to pressure"

Boyle's law is expressed mathematically as:

Pressure * Volume = constant

or P * V = k

Gay-Lussac's law indicates that when there is a constant volume, as the temperature increases, the pressure of the gas increases. And when the temperature is decreased, the pressure of the gas decreases. That is, the pressure of the gas is directly proportional to its temperature. Gay-Lussac's law can be expressed mathematically as follows:

\(\frac{P}{T}=k\)

Where P = pressure, T = temperature, K = Constant

Finally, Charles's law indicates that as the temperature increases, the volume of the gas increases and as the temperature decreases, the volume of the gas decreases. In summary, Charles's law is a law that says that when the amount of gas and pressure are kept constant, the quotient that exists between the volume and the temperature will always have the same value:

\(\frac{V}{T}=k\)

Combined law equation is the combination of three gas laws called Boyle's, Charlie's and Gay-Lusac's law:

\(\frac{P*V}{T} =k\)

Studying an initial state 1 and a final state 2, it is fulfilled:

\(\frac{P1*V1}{T1} =\frac{P2*V2}{T2}\)

In this case:

Replacing:

\(\frac{960 mmHg*550 mL}{473K} =\frac{830 mmHg*V2}{423 K}\)

Solving:

\(V2=\frac{423 K}{830 mmHg} *\frac{960 mmHg*550 mL}{473K}\)

V2= 568.9 mL

The volume will be 568.89 mL.

The initial kinetic energy is zero because the girl was at rest. The final kinetic energy is thus, 3100 J. Therefore, the change in kinetic energy is 3100 J

Kinetic energy of an object is generated by virtue of its motion. It is related to the mass and velocity of the object as follows:

Ke = 1/2 mv²

Given that, mass of girl = 50 kg

mass of bicycle = 12 kg.

total mass = 62 kg.

velocity = 10 m/s.

Then initial kinetic energy  = 0 since v = 0.

Then, ΔKe = 1/2 62 kg × (10 m/s)² - 0 = 3100 J

Therefore, the change in kinetic energy of the girl is 3100 J.

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Answer:

not enough information need more information to answer it