6. what is the ph of a buffer that is prepared by mixing 35.0 ml of 0.20 m acetic acid and 25.0 ml of 0.100 m naoh?

Answer:

Explanation:

42.32

Hope this helps sorry if wrong

The molarity of the unknown solution prior to dilution is calculated to be 1.31M.

The molarity of a solution can be calculated using the following formula:

C1V1 = C2V2

Where;

10.5 × C1 = 80 × 0.172

10.5C1 = 13.76

C1 = 13.76/10.5

C1 = 1.31M

Therefore, the molarity of the unknown solution prior to dilution is calculated to be 1.31M.

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The standard reaction entropy of N2(g) + 3 H2(g) → 2 NH3(g) is -196.3 J/K·mol.

What do you mean by standard reaction entropy?

Standard reaction entropy (ΔS°) is a measure of the disorder or randomness of a chemical reaction at a constant temperature and pressure. It is defined as the change in the entropy of the system when a reaction occurs under standard conditions. The standard state for a substance is its pure form at a pressure of 1 bar and a temperature of 25°C (298 K).

The standard reaction entropy (ΔS°) of a reaction can be calculated using the standard molar entropies (S°) of the reactants and products. The formula to calculate the standard reaction entropy is:

ΔS° = ΣS° (products) - ΣS° (reactants)

To calculate the standard reaction entropy for the reaction: N2(g) + 3 H2(g) → 2 NH3(g)

S° (N2) = 191.8 J/K·mol

S° (H2) = 130.6 J/K·mol

S° (NH3) = 192.5 J/K·mol

ΔS° = [2(S° (NH3)) - (S° (N2) + 3(S° (H2))]

ΔS° = [2(192.5) - (191.8 + 3(130.6))] J/K·mol

ΔS° = -196.3 J/K·mol

Hence, the standard reaction entropy of N2(g) + 3 H2(g) → 2 NH3(g) is -196.3 J/K·mol.

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Answer: 3 ,2, 6

Explanation:

3 Cu(NO3)2 + 2 K3PO4 → Cu3(PO4)2 + 6 KNO3

Molecules of glucose (blood sugar) contain 6 carbon atoms, 12 hydrogen atoms, and 6 oxygen atoms.

Hope this helped :)

Ionic bonds are created when two oppositely charged ions are attracted to one another by electrostatic force. A chemical element is uniquely defined by its atoms, which are tiny pieces of substance.

An atom is made up of a core nucleus and one or more negatively charged electrons that orbit it. The positively charged, comparatively hefty protons and neutrons that make up the nucleus may be present. Any elementary particle of matter with at least one proton is referred to as an atom. Examples of atoms are neon (N) and hydrogen (H) (Ne). Chemistry's fundamental building component is an atom. It is the lowest fraction of substance into which electrically charged particles cannot be released. It is also the smallest piece of substance with chemical element-like characteristics.

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One of the isomers of C4H10O that is an alcohol is the 1-butanol or butyl alcohol:

Another of the alcohols that has the given formula is tert-butanol or tert-butyl alcohol:

The third isomer of C4H10O is 2-butanol:

And the last isomer is isobutanol or isobutyl alcohol:

The first blank should be filled with "chemical shift." The chemical shift is the position of a signal on the NMR spectrum, and it is measured in parts per million (ppm). The chemical shift is determined by the magnetic field experienced by the hydrogen atoms in the molecule and is influenced by the surrounding electron density.

The second blank should be filled with "splitting." Splitting is the appearance of a signal on the NMR spectrum and is caused by the spin-spin coupling between neighboring hydrogen atoms. The splitting is based on the formula N+1, where N is the number of equivalent neighboring hydrogen atoms. The splitting pattern gives information about the number and arrangement of hydrogen atoms in the molecule.

The third blank should be filled with "integration." Integration is the area under a signal on the NMR spectrum and is proportional to the number of hydrogen atoms that produce the signal. Integration allows us to determine the relative number of hydrogen atoms in different parts of a molecule and is useful in determining the molecular formula of an unknown compound.

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D

Explanation:

Particles of the same charge repel each other

Answer:

I think carbon.

Explanation:

............

Answer:

Your answer is attached DAME!!!

The vapor pressure of a solution prepared by mixing 25 grams of methanol and 75 grams of ethanol at 20 degrees Celsius can be calculated using Raoult's law, which states that the vapor pressure of a component in a solution is directly proportional to its mole fraction.

To calculate the vapor pressure of the solution, we need to use Raoult's law, which is expressed as:

\(P_{total}\)= \(P_A\) ×   \(x_A\) +\(P_B\) ×   \(x_B\)

Where \(P_{total}\) is the vapor pressure of the solution, \(P_A\) and \(P_B\) are the vapor pressures of the individual components (methanol and ethanol in this case), and  \(x_A\) and  \(x_B\) are their respective mole fractions.

First, we need to calculate the mole fractions of methanol ( \(x_A\) ) and ethanol ( \(x_B\)) in the solution. To do this, we need to convert the masses of methanol and ethanol into moles using their molar masses. The molar mass of methanol \((CH_3OH)\) is 32.04 g/mol, and the molar mass of ethanol \((C_2H_5OH)\) is 46.07 g/mol.

Moles of methanol = 25 g / 32.04 g/mol

Moles of ethanol = 75 g / 46.07 g/mol

Next, we calculate the mole fractions:

\(x_A\) = Moles of methanol / (Moles of methanol + Moles of ethanol)

\(x_B\) = Moles of ethanol / (Moles of methanol + Moles of ethanol)

Now that we have the mole fractions, we can substitute them into Raoult's law to calculate the vapor pressure of the solution:

\(P_{total}\) = 92 torr × \(x_A\) + 45 torr ×  \(x_B\)

Substituting the calculated values of \(x_A\) and \(x_B\) will give us the vapor pressure of the solution at 20 degrees Celsius.

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Answer:

ionic covalent

Explanation:

Answer:

423.44 moles

Explanation:

The patagium (plural: patagia) is a membranous structure that assists an animal in gliding or flight. The structure is found in living and extinct groups of animals including bats, birds, some dromaeosaurs, pterosaurs, gliding mammals, some flying lizards, and flying frogs.

A prehensile tail is the tail of an animal that has adapted to grasp or hold objects. Fully prehensile tails can be used to hold and manipulate objects, and in particular to aid arboreal creatures in finding and eating food in the trees.

Answer:

patagium in American English

1. a wing membrane, as of a bat. 2. the extensible fold of skin of certain insects or of a gliding mammal or reptile, as a flying squirrel.

Explanation:

A prehensile tail pertains to the tail of certain animals that enable the latter to grasp or hold objects. ... A fully prehensile tail is one in which the animal can fully hold on to and manipulate an object with its tail.

Answer:

1 mole is equal to 1 moles Copper(II) Oxide, or 79.5454 grams. Note that rounding errors may occur, so always check the results.

Explanation:

This quantity may be expressed in scientific notation as 6.25 x 106 milliliters.

 You can convert the number of quarts to liters using the conversion factor in order to determine the number of milliliters in a family pool that contains 25,000 quarts of water. 0.25 liters are contained in 1 quart.

This means that 6,250 liters are equal to 25,000 quarts, or 25,000 * 0.25.

The conversion factor can then be used to convert liters to milliliters. Milliliters are equivalent to one liter. Accordingly, 6,250 liters are equivalent to 6,250 * 1,000, or 6,250,000 milliliters.

This quantity may be expressed in scientific notation as 6.25 x 106 milliliters.

It is frequently used to convey extremely big or extremely small values. In this instance, scientific notation enables us to express the volume of the family pool in a more condensed and readable manner.

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Answer:

animal cell

Explanation:

Cytokinesis -

It refers to the process of cell division, which takes place during mitosis, is known as cytokinesis.

The process of cytokinesis is different for animal cell and plant cell.

Hence, from the given information of the question,

The correct answer is animal cell.

Answer:

nitrogen

nitrogen oxide

zincflorite

?

potassium oxide

The accumulate lead sulfate and then convert it back into usable components helps to ensure that the battery can provide a reliable source of power over a long period of time.

In an automotive lead-acid battery, the negative plate is typically made of lead, although it may also contain small amounts of other elements such as tin, antimony, and calcium. The lead is usually in the form of a sponge-like structure that allows for a larger surface area, which helps to increase the battery's capacity.

During the charging process, lead sulfate forms on both the negative and positive plates. However, the negative plate tends to accumulate more lead sulfate than the positive plate. This is because the negative plate has a higher affinity for sulfate ions.

When the battery is charged, the lead sulfate on the negative plate is converted back into lead and sulfuric acid, which are the components needed to produce electricity. This process is known as the discharge cycle, and it is the opposite of the charging cycle.

Overall, the negative plate plays an important role in the operation of an automotive lead-acid battery.

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Answer:

X is hydrochloric acid solution, Z is sodium chloride solution and Y is sodium hydroxide solution.

Explanation:

I will try be as detailed as possible.

Litmus paper:

-Short summary: Bases will turn blue and red litmus papers to blue and acids will turn blue and red litmus papers to pink while the pink will remain pink.(Simple Mnemonic: You can say B from base turns blue litmus blue and the others are the opposite).

-Also, neutral solutions will have not cause any color change on litmus papers. This is because litmus papers have a color change in the presence of H+ from acids and Oh- from bases. So, blue litmus paper remains blue and red litmus paper remains pink.

-Hydrochloric acid solution is a strong monoprotic acid because it fully dissociates to produces H+ ions. Therefore, in the presence of blue and pink litmus papers it will turn the blue to pink and the pink will remain pink.

-Sodium chloride solution is a neutral solution because it dissociates to Na+ and Cl- which do not play a role in the color change.

-Sodium hydroxide solution is a strong monoprotic base hence it fully dissociates to produce OH- no wonder the high pH value.

pH value:

-Acids have a pH value is <7 while pH of neutral solutions is 7 and basic solutions is >7.

-So from this analogy we can say that hydrochloric acid solution is 2,sodium chloride solution is 7 and sodium hydroxide solution is 10.

Universal indicator:

-A universal indicator gives a more precise data as compared to litmus because it not only identifies the type of the solution (acidic, basic or neutral) it also tells us the strength of the solution by comparing the color of the solution when the universal indicator is added against the pH universal indicator scale.

-Unfortunately ,the colors are quite a lot and I cannot type all of them but you could search for 'pH universal indicator scale' to clearly see the whole thing.

-In the scale, you can see that after addition of the universal indicator, sodium chloride solution neutral solutions (pH7) will give a green color, hydrochloric acid solution (pH=2) which is a strong acidic solution will give a red color and sodium hydroxide solution (pH=10) which is a strong base will give a blue solution.

Reaction with Magnesium:

-I'd like to recommend also that you search for 'metal reactivity' so that you can be able to see the trend .

-A highly reactive metal can displace a low reactive metal but a low reactive metal cannot displace a high reactive metal under normal  conditions.

-So, for sodium hydroxide and sodium chloride solutions with magnesium ,magnesium cannot displace  sodium because sodium is one of the most reactive metals therefore there will be no change.

-For hydrochloric acid solution, the reaction will take place because Magnesium is more reactive than hydrogen thus can be able to displace hydrogen ions and form Magnesium chloride solution.

~I hope this will help. All the best:)

In the gradient method of HPLC, the solvent system can become more or less "reverse phase" over time, depending on the gradient program that is used.

In a reverse phase chromatography, the stationary phase is nonpolar while the mobile phase is polar. This means that the less polar or nonpolar components will be retained longer on the stationary phase, while the more polar components will elute faster with the mobile phase.

In a gradient program, the composition of the mobile phase is changed over time, with the proportion of the nonpolar or polar solvent increasing or decreasing gradually. In a reverse phase gradient, the proportion of the nonpolar solvent (typically an organic solvent like acetonitrile or methanol) will be increased over time, leading to a more nonpolar solvent system. This can cause the retention times to decrease for more polar compounds as they elute faster due to the increasing proportion of the nonpolar solvent.

Conversely, in a "forward" or "normal" phase gradient, the proportion of the polar solvent (typically water) will be increased over time, leading to a more polar solvent system. This can cause the retention times to increase for more polar compounds as they are retained longer due to the increasing proportion of the polar solvent.

In summary, the polarity of the solvent system in a gradient program can change over time, and whether it becomes more or less "reverse phase" depends on the gradient program that is used.

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The volume percentage of silicon in the alloy is approximately 38.2%.

To calculate the volume percentage of silicon in the alloy, we need to consider the weight percentage and the densities of silicon and aluminium.

First, we calculate the volume of each component in the alloy based on their weight percentages. Since the density is defined as mass per unit volume, we can use the weight percentage to determine the mass of each component. For example, in 100 grams of the alloy, we have 16 grams of silicon and 84 grams of aluminium.

Next, we calculate the volume of silicon and aluminium by dividing their respective masses by their densities. Using the density of silicon (2.35 gm/cc), we find that the volume of silicon is approximately 6.81 cc. Similarly, using the density of aluminium (2.7 gm/cc), we find that the volume of aluminium is approximately 31.11 cc.

Finally, we calculate the volume percentage of silicon in the alloy by dividing the volume of silicon by the total volume of the alloy (sum of the volumes of silicon and aluminium) and multiplying by 100. In this case, the volume percentage of silicon in the alloy is approximately 38.2%.

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Answer:

Liquid

Explanation:

Answer:

For the reaction CH3COOH→CH3COO– + H+

Among the given statements which is the correct statement?

CH3COOH is a Brønsted-Lowry base.

CH3COO– is an Arrhenius base.

CH3COOH is a Brønsted-Lowry acid.

CH3COO– is a Lewis base.

Explanation:

Bronsted acid is the proton donor.

Bronsted base is the proton acceptor.

Arrhenius base is the one that releases OH- ions when dissolved in water.

Lewis base is the one that is an electron-pair donor.

In the given reaction,

CH3COOH→CH3COO– + H+

Acetic acid releases a proton.

So, it is a proton donor.

Hence, It is a Bronsted-Lowry acid.

Third option is the correct answer.

The balanced chemical equation for the reaction of methane (CH4) with chlorine (Cl2) to form carbon tetrachloride (CCl4) and hydrogen chloride (HCl) is:

CH4 + 4Cl2 → CCl4 + 4HCl

From the equation, we can see that 1 mole of methane reacts with 4 moles of chlorine to produce 1 mole of carbon tetrachloride. The molar masses of CH4 and CCl4 are:

CH4: 12.01 g/mol + 4(1.01 g/mol) = 16.05 g/mol
CCl4: 12.01 g/mol + 4(35.45 g/mol) = 153.82 g/mol

Using the given mass of methane (1.93 g), we can calculate the number of moles of methane:

n(CH4) = m(CH4) / M(CH4) = 1.93 g / 16.05 g/mol = 0.120 mol

Since there is an excess of chlorine, all of the methane will react to form carbon tetrachloride. Therefore, the number of moles of CCl4 formed will be the same as the number of moles of methane used:

n(CCl4) = n(CH4) = 0.120 mol

Using the molar mass of CCl4, we can convert the number of moles to mass:

m(CCl4) = n(CCl4) x M(CCl4) = 0.120 mol x 153.82 g/mol = 18.46 g

Therefore, the mass of CCl4 formed by the reaction is 18.46 g. The answer is not any of the given options.
To determine the mass of CCl4 formed in the reaction of 1.93 g of methane (CH4) with an excess of chlorine (Cl2), we'll use stoichiometry.

First, balance the chemical equation: CH4 + 4Cl2 → CCl4 + 4HCl

Next, find the molar mass of CH4 and CCl4:
CH4: (12.01 g/mol C) + (4 × 1.01 g/mol H) = 16.05 g/mol
CCl4: (12.01 g/mol C) + (4 × 35.45 g/mol Cl) = 153.81 g/mol

Now, convert the given mass of methane to moles:
1.93 g CH4 × (1 mol CH4 / 16.05 g CH4) = 0.120 mol CH4

According to the balanced equation, 1 mol of CH4 reacts to produce 1 mol of CCl4. So, we have:
0.120 mol CH4 × (1 mol CCl4 / 1 mol CH4) = 0.120 mol CCl4

Finally, convert moles of CCl4 to mass:
0.120 mol CCl4 × (153.81 g CCl4 / 1 mol CCl4) = 18.46 g CCl4

The mass of CCl4 formed is approximately 18.5 g.

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