Which buffer system is the best choice to create a buffer with pH = 7.30? For the best system, calculate the ratio of the masses of the buffer components required to make the buffer.
o HC2H3O2/KC2H3O2HC2H3O2/KC2H3O2
o HClO2/KClO2HClO2/KClO2
o NH3/NH4ClNH3/NH4Cl
o HClO/KClO

If the cytosol loses K+ ions through leak channels, it will become more negative and increase the potential difference between the cytosol and extracellular fluid.

Potassium (K+) ions are positively charged and are important for many cellular processes, including maintaining the membrane potential. The cytosol, which is the fluid inside the cell, has a negative charge relative to the extracellular fluid due to the presence of negatively charged molecules. The loss of K+ ions through leak channels will cause the cytosol to become even more negative, increasing the potential difference between the cytosol and extracellular fluid. This can lead to changes in cellular activity, such as the opening or closing of ion channels or the release of neurotransmitters. Maintaining the proper balance of K+ ions is essential for normal cellular function.

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Answer:

Preparation and Standardization of 0.1 M Ferrous Ammonium...

Dissolve 40 g of ferrous ammonium sulfate in a previously cooled mixture of 40 ml of sulphuric acid and 200 ml of water.

Dilute with sufficient freshly boiled and cooled water to produce 1000 ml.

Standardize the solution in the following manner.

Explanation:

Answer:B

Explanation: according  to the law of electrostatics it states that  "unlike charge attract each other and like charges repel each other ".

we can use the ideal gas law, which relates the pressure (P), volume (V), temperature (T), and number of moles (n) of a gas. There are 2.32 moles of gas in the sample.

How to calculate no. of moles in the given sample?

To find the number of moles of gas in the sample, we can use the ideal gas law, which relates the pressure (P), volume (V), temperature (T), and number of moles (n) of a gas:

PV = nRT

where R is the gas constant. We can rearrange this equation to solve for n:

n = PV/RT

where P is the pressure in atmospheres, V is the volume in liters, T is the temperature in Kelvin, and R is the gas constant (0.08206 L atm/(mol K)).

First, we need to convert the temperature from Celsius to Kelvin by adding 273.15:

T = 133 C + 273.15 = 406.15 K

Then, we can plug in the given values:

n = (6.9 atm)(25.1 L)/(0.08206 L atm/(mol K))(406.15 K)

n = 2.32 moles

Therefore, there are 2.32 moles of gas in the sample.

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Explanation:

Remember, a hypothesis is an assumption that may only be accepted after been tested.

a. A formal question using chemistry language for this experiment could be;

Among plastic, foam, and paper, which has a better thermal insulating capacity?

b. Hypothesis: Plastic has a better thermal insulating capacity.

c. The Experimental variable is all the different kinds of materials used in cup production.

d. Three important control variables include;

e. Note in other to test your hypothesis, we need to measure the initial and final temperatures in all three kinds of cups.

Substance C is a solid solute because the solubility of a solid increases with increasing temperature. Therefore, option B is correct.

Solubility refers to the ability of a solute to dissolve in a solvent and form a homogeneous mixture called a solution. It is a measure of how much of a solute can dissolve in a given amount of solvent under specific conditions, such as temperature and pressure.

Solubility is typically expressed as the maximum amount of solute that can dissolve in a specified amount of solvent. The solubility of a substance is influenced by various factors, including the nature of the solute and solvent, temperature, pressure, and the presence of other substances.

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Answer: it's substance A hope it helps.!

The heat of vaporization for water is 2260 J/g. To find out how much heat is required to evaporate 2.54 g of water, we can use the formula: Q = m x ΔHv

Where Q is the heat required, m is the mass of the substance being evaporated, and ΔHv is the heat of vaporization. Therefore, to find out how much heat would be needed to evaporate 2.54 g of water, we can substitute the given values into the formula: Q = 2.54 g x 2260 J/g Q = 5740.4 J Thus, it would take 5740.4 J of heat to evaporate 2.54 g of water.

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Based on the the relative strengths of the intermolecular attractions, the correct selections are:

a. C₃H₈ > CH₄

c. ICl > I₂

e. H₂Se > H₂O

g. CH₂Cl₂ > CH₃Cl

i. NOF > NOCl

To determine the substance with the higher boiling point based on the relative strengths of intermolecular attractions, we need to consider the types of intermolecular forces present in each substance. The stronger the intermolecular forces, the higher the boiling point.

a. C₃H₈ > CH₄: C₃H₈ (propane) has a higher boiling point than CH₄ (methane) because propane has a larger molecular size and exhibits stronger London dispersion forces due to increased electron-electron interactions.

c. ICl > I₂: ICl (iodine chloride) has a higher boiling point than I₂ (diatomic iodine) due to the presence of polar covalent bonds in ICl. The dipole-dipole interactions between the polar I-Cl bonds in ICl are stronger than the London dispersion forces in I₂.

e. H₂Se > H₂O: H₂Se (hydrogen selenide) has a higher boiling point than H₂O (water) because H₂Se molecules exhibit stronger London dispersion forces compared to H₂O, which has hydrogen bonding.

g. CH₂Cl₂ > CH₃Cl: CH₂Cl₂ (dichloromethane) has a higher boiling point than CH₃Cl (chloromethane) due to the presence of two chlorine atoms in CH₂Cl₂, which enhances the strength of London dispersion forces compared to the single chlorine atom in CH₃Cl.

i. NOF > NOCl: NOF (nitrogen monoxide fluoride) has a higher boiling point than NOCl (nitrogen monoxide chloride) because the fluorine atom in NOF forms a stronger hydrogen bond with nitrogen compared to the chlorine atom in NOCl, resulting in stronger intermolecular forces.

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Silk and wool are more easily dyed with azo dyes than other fabrics like nylon or cotton because they are polypeptides.

Polypeptides or polymers made of amino acids are what makeup wool and silk. Natural protein fibers like wool and silk, synthetic polyamide fibers like nylon, and, to a lesser extent, acrylic fibers and blends of these fibers, are typically dyed with acid dyes. They are applied to these fibers from a dyebath under acidic or neutral conditions, thus their name. The azo group is the most widely used chromophore in acid dyes. When an ionic bond is formed between the protonated amine group of the fiber and the acid group of the dye, acid dyes that are anionic and soluble in water are applied to wool, silk, and nylon

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Answer:

Explanation:

here you will use the POEM:

% to mass, mass to mole, divide by small, multiply til whole (if needed)

2) find the molecular formula by using the formula

n = molecular weight or molar mass of true compound/empirical weight x 100

Assume 100 g of Compound X to make % equal mass:

% to mass, then mass to mole, now divide by small

40.00 g C x 1 mole/12.01 gC =    3.33  mole C  /3.33 = 1

6.71 g H x 1mole/1.01 g H =         6.64   mole H /3.33 = 2

53.29g O x 1 mole/16.00 g O =   3.33   mole O /3.33 =1

because we end up with the whole numbers, we do not need to use the 4th step.

so the empirical formula is C1H2O1

now to figure out what the molecular formula is we use:
n = multiple = mw/ew = m

we need to find the empirical weight:
C1H2O1 = 1x12.01 + 2x1.01 + 1 x 16 = 30.03 g/mol

molecular formula = (empirical formula)n

n = 180.15/30.03 = 6

so the answer is (C1H2O2)6  = C6H12O6

The compound X has a molar mass of\(180.15 g.mol^-^1\) and consists of 40.00% carbon, 6.71% hydrogen, and 53.29% oxygen.

To determine the molecular formula of compound X, we need to find the empirical formula and then determine the factor by which the empirical formula should be multiplied to obtain the molecular formula.

First, we calculate the number of moles of each element present in 100g of compound X.

The mass of carbon in 100g of X is 40.00g, which corresponds to 40.00/12.01 ≈ 3.33 moles of carbon.

The mass of hydrogen in 100g of X is 6.71g, which corresponds to 6.71/1.01 ≈ 6.64 moles of hydrogen.

The mass of oxygen in 100g of X is 53.29g, which corresponds to 53.29/16.00 ≈ 3.33 moles of oxygen.

Next, we find the simplest whole-number ratio of the elements. Dividing the number of moles by the smallest number of moles (3.33 moles) gives us a ratio of approximately 1:2:1 for carbon, hydrogen, and oxygen, respectively.

Therefore, the empirical formula of compound X is \(CH_2O\).

Finally, to find the molecular formula, we need to determine the factor by which the empirical formula should be multiplied to obtain the molar mass of \(180.15 g.mol^-^1\). The molar mass of \(CH_2O\) is 12.01 + 1.01 * 2 + 16.00 = \(30.03 g.mol^-^1\).

Dividing the molar mass of the compound (\(180.15 g.mol^-^1\)) by the molar mass of the empirical formula (\(30.03 g.mol^-^1\)), we find that the factor is approximately 6.

Therefore, the molecular formula of compound X is \(C_6H_1_2O_6\).

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The moles would be 12 moles, 4 moles and 11.34 moles

When hydrogen gas (H2) reacts with oxygen gas (O2) to produce water (H2O), the balanced chemical equation is:

2H2 + O2 -> 2H2O

So,

For every 6 moles of H2, 12 moles of H2O will be produced

For every 2 moles of H2, 4 moles of H2O will be produced

For every 5.67 moles of H2, 11.34 moles of H2O will be produced.

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Answer:

B

Explanation:

The nonrenewable energy source among the options provided is fossil fuel energy, option C is correct.

Fossil fuels, such as coal, oil, and natural gas, are derived from ancient organic matter that has been buried and transformed over millions of years. These resources are finite and cannot be replenished within a human lifespan. Additionally, their combustion releases carbon dioxide and other greenhouse gases, contributing to climate change and air pollution.

Solar energy, wind energy, tidal energy, and geothermal energy are renewable sources of energy. They rely on naturally replenishing resources like sunlight, wind, tides, and heat from the Earth's core, making them sustainable and environmentally friendly alternatives to fossil fuels, option C is correct.

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The complete question is:

Which of the following energy sources is considered nonrenewable?

A. solar energy

B. wind energy

C. fossil fuel energy

D. tidal energy

E. geothermal energy

Answer:

22.4 L.

Explanation:

Answer:

Explanation:

The law of conservation of mass states that matter cannot be created or destroyed in a chemical reaction. For example, when wood burns, the mass of the soot, ashes, and gases, equals the original mass of the charcoal and the oxygen when it first reacted.

Answer:

Br

Explanation:

Answer:

Styrofoam dissolves in acetone similar to how sugar dissolves in water.

Explanation:

Vanillyl alcohol can be synthesized through the sodium borohydride reduction of vanillin.

The reaction proceeds through several steps, starting with the addition of sodium borohydride to the carbonyl group of vanillin. This results in the formation of an alkoxide intermediate, which is then protonated to yield the reduced product, vanillyl alcohol.
The full mechanism of the sodium borohydride reduction of vanillin involves several steps. First, the sodium borohydride (\(NaBH_4\)) adds to the carbonyl group of vanillin, resulting in the formation of an alkoxide intermediate. Next, water is added to the reaction mixture to protonate the alkoxide, forming the desired product, vanillyl alcohol.
The balanced reaction equation for the reduction completed in this lab is:
\(C_8H_8O_3 + 4 NaBH_4 + 4 H_2O --> C_8H_{10}O_3 + 4 NaBO_2 + 6 H_2\)
In this equation, vanillin (\(C_8H_8O_3\)) reacts with 4 equivalents of \(NaBH_4\) and 4 equivalents of water to yield 1 equivalent of vanillyl alcohol (\(C_8H_{10}O_3\)), 4 equivalents of \(NaBO_2\), and 6 equivalents of hydrogen gas.

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The valence electrons are located in the outermost orbitals of an atom.

The valence electrons of an atom are located in its outermost orbitals, also known as valence shells. These orbitals, which vary in size and energy depending on the atom, hold the electrons that are most likely to be involved in chemical reactions. Valence electrons are responsible for most of the bonding interactions between atoms, making them the most important electrons in a chemical reaction. In general, the number of valence electrons corresponds to the number of bonds an atom can form. For example, carbon, which has four valence electrons, can form four covalent bonds. As such, the valence electrons of an atom have a major impact on its chemical properties.

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Answer:

precipitate

Explanation:

pretty sure it's right but sorry if i'm wrong:)

The three sentences about the micro ecosystem have been given below

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Answer:

10250.8

Explanation:

Formula

multiply the energy value by 4184

Polyprotic Acid : Acids that can mislay, and bases that can gather up, more than one H+ (e.g. diprotic H2A and triprotic H3A acids).

Ionization take place stepwise, and each and every step has its own Ka.

H3PO4 (aq) ⇌ H+ (aq) + H2PO4 - (aq) Ka1 = 7.2 x 10-3

H2PO4 - (aq) ⇌ H+ (aq) + HPO4 2- (aq) Ka2 = 6.3 x 10-8

HPO4 2- (aq) ⇌ H+ (aq) + PO4 3- (aq) Ka3 = 4.2 x 10-13

According to question

To decide the fractional concentrations of one and all species at assorted pH values, first write the Henderson-Hasselbalch equation for each and every dissociation reaction.

Formula of Henderson-Hasselbalch equation is :

pH = pKa + log10 ([A–]/[HA])

pH = pK1+log[H2PO^4-] / [H3PO4]

pH=pK2+log[ HPO^2-] / [H2PO^4-]

pH = pK3+log[PO^3- 4] / [HPO^2- 4]

a. Fraction of H3PO4: pH0 = 0.993; pH2 = 0.58; pH4 = 0.01 ; pH 6 is negligible.

b. Fraction of HPO4 ^2- : pH 0 is negligible and 0.06; pH8 = 0.86; pH10 = 1.0; pH12 = 0.72

c. Fraction of PO3 ^2- : negligible at any pH < 10 ; pH 12 = 0.28

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The first step to calculate the percent hydrogen by weight of the given solution is to determine the mass of hydrogen in the solution.

CH₂COCH is the molecular formula for acetone, which has a molecular weight of 58.08 g/mol. It has a molecular structure of C3H6O, which means it has 6 hydrogen atoms in its structure.

To determine the amount of acetone present in the solution, we need to use its density. Given that the density of acetone is 0.788 g/mL, the mass of acetone in 53.5 mL of the solution can be calculated as follows:

Mass of acetone = Volume of solution × Density of acetone

Mass of acetone = 53.5 mL × 0.788 g/mL

Mass of acetone = 42.108 g

Now that we know the mass of acetone in the solution, we can calculate the mass of hydrogen present in the solution.

Mass of hydrogen = Number of hydrogen atoms × Atomic weight of hydrogen × Number of moles of acetone

Mass of hydrogen = 6 × 1.008 g/mol × (42.108 g / 58.08 g/mol)

Mass of hydrogen = 2.744 g

Finally, to calculate the percent hydrogen by weight, we divide the mass of hydrogen by the total mass of the solution and multiply by 100.

% hydrogen by weight = (Mass of hydrogen / Total mass of solution) × 100

% hydrogen by weight = (2.744 g / 42.108 g) × 100

% hydrogen by weight = 6.51%

Therefore, the percent hydrogen by weight of the given solution is 6.51%.

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The demand for almond milk decreases because of a change in price from $5 to $10. Details about demand can be found below.

Demand refers to the amount of goods a consumer is willing and able to buy at a given price and at a particular time.

Several factors can affect the demand of a particular good. According to this question, the price of a gallon of almond milk increases from $5 to $10, so people start buying more oat milk as an alternative.

Therefore, it can be said that the demand for almond milk decreases because of a change in price from $5 to $10.

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Answer:

decreased:related goods

Explanation:

ik it seems like decreased:income but i just took the test twice and ik for a fact its c not d

As an antimicrobial, silver nitrate, an organic compound, is used. Silver nitrate is used topically (to also be applied to a skin) to cauterise sick tissues around a skin wound.

Dip its caustic tip of a potassium iodide applicator stick into deionized or distilled water to slightly moisten it. Along the tissue that needs to be cauterised, rub and turn the applicator tip. Never use the tip to contact any other parts of the body.

Dip its caustic tip of a potassium iodide applicator stick into deionized or distilled water to slightly moisten it. Along the tissue that needs to be cauterised, rub and turn the applicator tip. Never use the tip to contact any other parts of the body.

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