Write balanced equations and Kb expressions for these Brønsted-Lowry bases in water:Benzoate ion, C₆H₅COO⁻

(b)

only CaCO3

Explanation:

Given:

Alkaline solution= 2 x 10^-4 M in CO32-Pool water was originally 4 x 10^-3 M in Mg2+, 6 x 10^-4 M in Ca2+ and 8 x 10^-7 M in Fe2+

Precipitate should be of:

MgCO3, CaCO3 and FeCO3

We know that:

Mg2+ + CO32- → MgCO3Ca2+ + CO32- → CaCO3Fe2+ + CO32- → FeCO3Thus, for MgCO3 to form, [CO32-] should be 4 x 10^-3 M which is not possible in the given question.

For CaCO3 to form,[CO32-] should be 6 x 10^-4 M which is possible.

So, precipitate should be only CaCO3.

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There are 23 atoms of Fe in a 55.845 gram. As a result, after dividing our mass of 239 grams by the iron formula mass of 55.84 grams per bole, formol equals after calculation.

Use the millimeters to mole formula to calculate the molecular weight n, of a substance with a given mass, m, (in grams) accurately. n = m / M, where M is the substance's molar mass also known as gram-molecular weight. a substance's molecular weight expressed as a mass in grams. Example: NaCl salt weighs 58.44 grams per gram-mole. American Meteorological Society, copyright 2022.

Number of Avogadro = 6.023 × 10²³. The products of every chemical reaction are measured using the Avogadro number. 1 mole of atoms, molecules, or particles is equal to 6.023 x 1023. Calculating the number of molecules is as follows: mole number = quantity of material / mass of one mole.

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There are 23 atoms of Fe in a 55.845 gram. As a result, after dividing our mass of 239 grams by the iron formula mass of 55.84 grams per bole, formol equals after calculation.

Use the millimeters to mole formula to calculate the molecular weight n, of a substance with a given mass, m, (in grams) accurately. n = m / M, where M is the substance's molar mass also known as gram-molecular weight. a substance's molecular weight expressed as a mass in grams. Example: NaCl salt weighs 58.44 grams per gram-mole. American Meteorological Society, copyright 2022.

Number of Avogadro = 6.023 × 10²³. The products of every chemical reaction are measured using the Avogadro number. 1 mole of atoms, molecules, or particles is equal to 6.023 x 1023. Calculating the number of molecules is as follows: mole number = quantity of material / mass of one mole.

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Answer:

1) petroleum, mixture, not found on periodic table

2) hydrogen and helium, mixture, contains "and"

3) iron sulphide, compound, ends with "ide"

4) carbon dioxide, compound, ends with "ide"

5) salt water, mixture, not found on periodic table

6) milk and sugar, mixture, contains "and"

7) silver nitrate, compound, ends with "ate"

8) sodium carbonate, compound, ends with "ate"

9) carbon electrode, mixture, not found on periodic table

10) astatine, element, found on periodic table

11) argon, element, found on periodic table

12) oxidane, compound, contains "ane"

13) iron and sulphur, mixture, contains "and"

14) methane, compound, contains "ane"

Explanation:

Answer:

A molecular compound is usually composed of two or more nonmetal elements. Molecular compounds are named with the first element first and then the second element by using the stem of the element name plus the suffix -ide.

Answer:

All atoms of chlorine (Cl) have 17 protons, but there are chlorine isotopes with 15 to 23 neutrons

Explanation:

Although all atoms of an element have the same number of protons, individual atoms may have different numbers of neutrons. These differing atoms are called isotopes.

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It's more common to prepare acetic acid solutions with concentrations in the range of 0.1 to 1.0 M.

What is Acetic Acid?

Acetic acid is an organic acid with the chemical formula CH3COOH. It is a clear, colorless liquid with a pungent odor and sour taste. It is also known as ethanoic acid and is the main component of vinegar, which is typically composed of 5-20% acetic acid by volume.

To calculate the molarity of a solution, we need to know the number of moles of solute and the volume of the solution in liters.

In this case, we are given the number of moles of acetic acid (2.08 mol) and the volume of the solution (15 mL or 0.015 L). We can use the formula for molarity:

Molarity = moles of solute / volume of solution (in liters)

Molarity = 2.08 mol / 0.015 L = 139 M

Therefore, the molarity of the solution produced is 139 M. However, it's important to note that this concentration is extremely high and not practical or feasible for most laboratory or industrial purposes.

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Answer:

I imagine the answer would be Charles Darwin's theory of natural selection.

Explanation:

Natural selection explains that some organisms, like animals, possess inheritable traits that allow them to better survive within and adapt to their environment, compared to other organisms. That species will be able to outlive those without the trait(s) as they have more opportunities to reproduce and pass their inherited genes onto the next generation. This is why "natural selection" most fits within question number 3's blank space.

Answer:

Because the equilibrium constant is only at constant at temperature. Changing the temperature changes the Ka.

The correct answer is Carbon Monoxide (CO). When organic matter is burned with insufficient oxygen, it leads to incomplete combustion and the production of various gases, including carbon monoxide. Carbon monoxide is a colorless, odorless gas that is extremely poisonous and can be fatal in high concentrations.Carbon dioxide (CO2) is a product of complete combustion and is not produced when there is insufficient oxygen.Benzene is a hydrocarbon compound composed of six carbon atoms and six hydrogen atoms, and it is not produced from combustion.Methane (CH4) is a hydrocarbon compound composed of one carbon atom and four hydrogen atoms, and it is not produced from combustion.Mercury is a metallic element and is not related to combustion.

Taking into account the definition of dilution, the volume of the 2.00 M stock solution of KCl needed to produce the solution is 47.5 mL.

Dilution is the process of creating a less concentrated solution from a more concentrated one. Simply adding more solvent at the same solute concentration makes it happen.

The concentration of the solute falls when additional solvent is added, despite the fact that the amount of solute remains constant as the volume of the solution rises.

A dilution is mathematically expressed as:

Ci×Vi = Cf×Vf

where

Ci: initial concentration

Vi: initial volume

Cf: final concentration

Vf: final volume

Volume of the stock solution

In this case, you know:

Ci= 2 M

Vi= ?

Cf= 0.380 M

Vf= 0.250 L

Replacing in the definition of dilution:

2 M× Vi= 0.380 M× 0.250 L

Solving:

Vi= (0.380 M× 0.250 L)÷ 2 M

Vi= 0.0475 L= 47.5 mL (being 1 L= 1000 mL)

In summary, 47.5 mL of stock solution are needed.

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Answer: if a biochemical reaction in our body is too fast or too slow it can endanger our life.

Explanation:in other example ,rate of reaction is obviously very important to the chemical industry. The rate of reaction dictates the rate of production our daily products.

The lower vapor pressure results in a depressed freezing point. As a result, the graph shifts, and the triple point is lowered resulting in a lower melting point.

The boiling factor of a substance is the temperature at which the vapor stress of a liquid equals the stress surrounding the liquid and the liquid modifications right into a vapor. the warmth of vaporization is the energy required to convert a given amount (a mol, kg, pound, and so on.) of a substance from a liquid right into gasoline at a given pressure (frequently atmospheric stress).

The boiling point of a liquid varies consistent with the carried-out strain; the normal boiling point is the temperature at which the vapor stress is equal to the same old sea-stage atmospheric pressure (760 mm [29.92 inches] of mercury). At sea level, water boils at 100° C (212° F). The boiling factor of a natural substance is the temperature at which the substance transitions from a liquid to the gaseous phase.

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Many companies maintain their internal records using FIFO or the average cost method, but use LIFO for external reporting and income tax purposes.

What is FIFO and LIFO?

FIFO

First In, First Out, sometimes known as FIFO, is a strategy of managing assets and valuing them that prioritises the sale, use, or disposal of assets that were produced or acquired first. For taxation purposes, FIFO presumes that the cost of items sold on the income statement includes the assets with the oldest expenses (COGS).

LIFO

The cost of the most recent goods acquired is used to compute the cost of goods sold (COGS), while older inventory value is accounted for as ending inventory on a balance sheet, according to the last in, first out (LIFO) method of inventory valuation.

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The standard enthalpy of reaction for a system in which increasing the temperature by 15 K reduces the equilibrium constant by half, relative to its value at 310 K is -0.956 kJ/mol.

Given: ΔT = 15 K and ∆K/K = 1/2

Temperature is directly proportional to equilibrium constant K,

So, ∆T/T = ∆K/K

This can be written as ∆K/K = ΔH°/R × (1/T2 − 1/T1)

On solving this equation, we getΔH° = −2.303 × R × ΔK/K × T2T2 = 310 + 15 = 325 K∆K/K = 1/2∆H° = −2.303 × 8.314 J mol−1 K−1 × 1/2 × 325 K∆H° = −955.7 J mol−1= −0.956 kJ/mol

Therefore, the standard enthalpy of reaction for a system in which increasing the temperature by 15 K reduces the equilibrium constant by half, relative to its value at 310 K is -0.956 kJ/mol.

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A. Nickel added to a potassium chloride solution has no reaction.

Chemical response is the process by which one or further composites, known as reactants, change into one or further new bones , known as products. Chemical rudiments or chemical composites make up substances. In a chemical response, the tittles that make up the reactants are rearranged to produce colorful products.

Chemical responses are a abecedarian element of life itself, as well as technology and culture. Burning energies, smelting iron, creating glass and crockery, brewing beer, making wine, and making rubbish are just a many exemplifications of ancient processes that involved chemical responses.

The Earth's geology, the atmosphere, the abysses, and a wide variety of intricate processes that take place in all living systems are replete with chemical responses.

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Answer: yes, it depends on the substance though

Explanation:

The pKa value of trifluoromethyl methyl sulfone (CF3SO2Me) is around 9.8.

This means that the compound is weakly acidic and will only partially dissociate in water to release a proton (H+). Trifluoromethyl methyl sulfone belongs to a class of compounds called sulfonyl compounds or sulfones.

These compounds contain a sulfur atom double-bonded to an oxygen atom and two additional oxygen atoms bonded to the sulfur atom. Sulfonyl compounds are widely used in organic chemistry as oxidizing agents, catalysts, and as building blocks for drug development.

Trifluoromethyl methyl sulfone is a commonly used reagent for the synthesis of various organic compounds. It is also used as a solvent for chemical reactions and as a stabilizer for lithium-ion batteries.

The knowledge of the pKa value of trifluoromethyl methyl sulfone is essential in understanding its reactivity and its role in various chemical reactions.

The pKa of trifluoromethyl methyl sulfone (CF3SO2Me) is a measure of its acidity.

In general, pKa refers to the negative logarithm of the acid dissociation constant (Ka) and is used to evaluate the strength of an acid. A lower pKa value indicates a stronger acid, while a higher value indicates a weaker acid.

Trifluoromethyl methyl sulfone, also known as methyl trifluoromethanesulfonate, is a sulfone derivative. Sulfones are organic compounds containing a sulfonyl functional group (R-SO2-R') bonded to two carbon atoms. In the case of CF3SO2Me, the sulfone group is bonded to a trifluoromethyl group (CF3) and a methyl group (Me).

The exact pKa value of trifluoromethyl methyl sulfone is not commonly reported in the literature. However, it is known to be a strong acid due to the electron-withdrawing nature of the trifluoromethyl group, which increases the acidity of the compound. This results in a low pKa value, making CF3SO2Me an effective reagent in various organic synthesis reactions.

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The specialist catalyst used for cracking is aluminosilicates, specifically zeolites. Therefore the correct option is (b) Aluminosilicates.

Aluminosilicates are a combination of silica and alumina, and they are commonly used as catalysts in the cracking process. Zeolites, a type of aluminosilicate, are particularly popular in cracking reactions due to their unique properties. Zeolites have a three-dimensional pore structure with pore sizes ranging from about 4 Å to 15 Å. This pore structure allows zeolites to effectively crack larger hydrocarbon molecules into smaller, more valuable ones.

Zeolite catalysts are shaped like a honeycomb and possess a high surface area, providing ample space for hydrocarbon molecules to interact with the catalyst. When hydrocarbon molecules come into contact with zeolite catalysts, they enter the pores and undergo the cracking process. This process breaks down the larger molecules into smaller, more manageable ones that can be further processed into useful products like gasoline or diesel fuel.

Zeolites offer several advantages as catalysts. They are highly stable and selective, meaning they can promote the desired cracking reactions while minimizing unwanted side reactions. Zeolites can function effectively under a wide range of reaction conditions, making them versatile catalysts for various cracking processes. Additionally, zeolites are easily regenerated and have a long lifespan, contributing to their economic viability and sustainability.

In summary, aluminosilicates, particularly zeolites, serve as the specialist catalyst for the cracking process. Zeolites' unique pore structure and surface area enable them to efficiently crack larger hydrocarbon molecules into smaller ones, facilitating the production of valuable products. Zeolites offer stability, selectivity, and versatility, making them widely employed catalysts in the refining of petroleum products.

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Answer:

Her speed is 6.8m/s.

Explanation:

K.E= 1/2mv²

or, 2543.2= 1/2×110×v²

or, 2543.2 = 55v²

or, 2543.2/55 = v²

or, 46.24 = v²

or, 6.8² = v²

v = 6.8 m/s

answer

6.8

explanation

k.e=1/2v^2

2543.2=55v^2

46.24=v^2

6.8^2=v^2

v=6.8

For atleast 15 mins

Lab safety

For small liquid spill or splash that affects only a small area of skin, you should immediately flush skin with flowing water for at least 15 minutes (30 minutes for bases).

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Primary amines can be distinguished from secondary and tertiary amines by reacting with nitrous acid (HNO2). The reaction with nitrous acid is known as the "Diazotization reaction" and is specific to primary amines.

This reaction allows for the conversion of primary amines into diazonium salts, which are highly unstable and can undergo further reactions to form various products.

In the diazotization reaction, primary amines react with nitrous acid to form a diazonium salt and water. The reaction proceeds as follows:

R-NH2 + HNO2 -> R-N2+X- + H2O

Secondary and tertiary amines do not undergo this reaction with nitrous acid because they lack the necessary hydrogen atom on the nitrogen atom to form the diazonium salt. Therefore, this reaction can be used as a distinguishing test to differentiate primary amines from secondary and tertiary amines.

The formation of the diazonium salt can be confirmed through various tests, such as the formation of colored precipitates or the coupling reactions with other compounds. These reactions are specific to primary amines and help in their identification and distinction from secondary and tertiary amines.

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Answer:

Only chemical equation uses arrow instead of = sign

Answer:

Only chemical equation uses an arrow instead of a = sign.

A chemical equation depicts a chemical reaction by utilising chemical formulae and symbols to depict the reactants, products, and chemical changes that take place. In a chemical equation, the arrow indicates the direction of the reaction and is commonly depicted as a single arrow pointing from the reactants to the products. In contrast, the equals sign (=) is commonly used in mathematical equations to indicate that two expressions have the same value.

While numbers are used to indicate the relative proportions of reactants and products and minus signs are used to indicate reactants or products in the form of ions, the arrow is the most distinguishing feature that distinguishes chemical equations from mathematical equations.

When doubling the number of the moles of the HCl decrease the rate of HCl production because the acid convertase enzyme is converting HCl back into H⁺ and Cl⁻.

The reaction is as follows :

H⁺  +  Cl⁻  ⇄ HCl

If we double the number of the moles of the HCl , it decreases the rate of the HCl production because of the reason that  the acid convertase enzyme is converting the HCl back into the H⁺ and Cl⁻. The purpose of the  enzyme is to allow the conversion of the reactant to the product and the product back to the reactant

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Answer: S

:) hope this helps you!

The molar concentration of a solution containing 469 grams of C6H12O6 in 82 milliliters of water is 31.7M.

The number of moles = 469g ÷ 180.156g/mol = 2.6mol

Volume of water in litres = 82/1000 = 0.082L

Concentration of solution = 2.6mol ÷ 0.082L = 31.71M

Therefore, the molar concentration of a solution containing 469 grams of C6H12O6 in 82 milliliters of water is 31.7M.

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Answer:

The electrode that removes ions from solution

Explanation:

Each electrochemical cell consists of an anode and a cathode. Oxidation occurs at the anode and reduction occurs at the cathode.

At the anode, ions move from the electrode into the solution while at the cathode ions move from the solution to the electrode.

At the cathode, metal ions accept electron(s) and become deposited on the electrode hence this electrode removes ions from solution. This is reduction.

The formula of the compound will be  \(Mg_2Ga\)

The compound contains magnesium and gallium. The symbol and magnesium and gallium is Mg and Ga respectively.

Magnesium content is 41.1%

Gallium content is 58.9%

First, find the number of moles of each element in the compound by dividing their percentage compositions with their respective molar weights.

Mg = 41.1/24.505 =1.6772

Ga = 58.9/69.723 = 0.8448

Next, divide each number of moles by the smallest number of moles.

Mg = 1.6772/0.8448 = 2

Ga = 0.8448/0.8448 = 1

Thus, the formula of the compound is \(Mg_2Ga\)

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Answer:

Explanation:

a) v=w*lambda

wavelength=5/2.5

wavelength=2m

b)342/320=1.06875m

c)342/1.5=228 Hz

d)4.6153=v/wave

Explanation: