for a buffers solution, when small amounts of acids or bases are added to the buffer solution then buffer keeps the ph of the solution stable.
TRUE OR FALSE

Answer:

Explanation:

To find the number of moles in a substance given it's number of entities we use the formula

\(n = \frac{N}{L} \\\)

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

From the question we have

\(n = \frac{9.20 \times {10}^{24} }{6.02 \times {10}^{23} } \\ = 15.282392..\)

We have the final answer as

Hope this helps you

we need to consider the types of intermolecular forces present in each compound. Ranking from weakest to strongest intermolecular forces: H₂S < H₂Se < H₂Po < H₂Te

a. H₂S is a polar molecule with dipole-dipole interactions. It exhibits London dispersion forces as well.

b. I₂ is a nonpolar molecule with only London dispersion forces.

c. N₂ is a nonpolar molecule with only London dispersion forces.

d.  H₂O is a polar molecule with stronger dipole-dipole interactions compared to H2S.

H₂Se, H₂S, H₂Po, H₂Te:

a. H₂Se: H₂Se is similar to H₂S and exhibits polar covalent bonds with dipole-dipole interactions.

b. H₂S: H₂S is a polar molecule with dipole-dipole interactions.

c. H₂Po: H₂Po is a polar molecule with dipole-dipole interactions. The presence of heavier atoms .

d. H₂Te: H₂Te is a polar molecule with dipole-dipole interactions

Ranking from weakest to strongest intermolecular forces: H₂S < H₂Se < H₂Po < H₂Te

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Answer:

CH4

Explanation:

A= CH4

If you drink 2.00 large cups of dark roasted coffee, you would consume 608.0 mg of N-methylpyridinium (NMP).

To calculate this, first, we need to convert the volume of coffee from fluid ounces to liters, using the conversion factor 1 L = 33.814 fl oz:

2.00 large cups × 10.0 fl oz/large cup ÷ 33.814 fl oz/L = 0.591 L

Next, we can use the concentration of NMP in the coffee to calculate how much NMP is in 0.591 L of coffee:

30.4 mg NMP/L × 0.591 L = 17.9584 mg NMP

Therefore, if you drink 2.00 large cups of dark roasted coffee, you would consume approximately 18 mg of NMP.

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The biosynthesis of cholesterol is a complex process that involves multiple steps and intermediates. The pathway starts with acetyl CoA, which is converted to HMG-CoA by the enzyme HMG-CoA reductase. Mevalonate is then formed by the action of several enzymes. The next intermediates are isopentenyl pyrophosphate, geranyl pyrophosphate, and farnesyl pyrophosphate, which are formed by the condensation of several molecules of isopentenyl pyrophosphate.

Finally, lanosterol is formed from squalene through several intermediate steps, which ultimately lead to the production of cholesterol. This process is tightly regulated, and any disruption in the biosynthesis of cholesterol can lead to various diseases. In the biosynthesis of cholesterol, the correct order of the first three intermediates is: acetyl CoA → HMG-CoA → mevalonate.
The next three intermediates, in the correct order, are: isopentenyl pyrophosphate → geranyl pyrophosphate → farnesyl pyrophosphate.
The remaining intermediates to form cholesterol are: squalene → squalene epoxide → lanosterol → cholesterol.

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Answer:

t = 42.4 years

Explanation:

To find the amount of time needed for the sample to decay, you need to use the half-life equation:

\(N(t) = N_0(\frac{1}{2})^{t/h}\)

In this equation,

-----> N(t) = final mass (mg)

-----> N₀ = initial mass (mg)

-----> t = time passed (yrs)

-----> h = half-life (yrs)

You can find how much time passed by plugging the given variables into the equation and solving for "t". The final answer should have 3 sig figs like the given values.

N(t) = 9.38 mg                       t = ? yrs

N₀ = 25.0 mg                        h = 30.0 yrs

\(N(t) = N_0(\frac{1}{2})^{t/h}\)                                <----- Half-life equation

\(9.38mg = 25.0mg(\frac{1}{2})^{t/30.0yrs}\)              <----- Insert variables

\(0.3752 = (\frac{1}{2})^{t/30.0yrs}\)                          <----- Divide both sides by 25.0 mg

\(ln(0.3752) = ln((\frac{1}{2})^{t/30.0yrs})\)              <----- Take the natural log of both sides

\(ln(0.3752) = \frac{t}{30.0yrs} ln(\frac{1}{2})\)                   <----- Rearrange the exponent

\(-9.803 = \frac{t}{30.0yrs} (-0.6931)\)                 <----- Solve the natural logs

\(1.1414= \frac{t}{30.0yrs}\)                                  <----- Divide both sides by -0.6931

\(42.4 yrs= t\)                                        <----- Multiply both sides by 30.0 yrs

Photosynthesis is a process of food and energy production by autotrophs. Water and carbon dioxide in the presence of sunlight gives oxygen and sugar.

Photosynthesis is a biochemical reaction that uses organic and inorganic compounds and converts the molecules with the help of biological organs and substances.

The reactant of the process includes atmospheric water vapours, carbon dioxide and the heat and energy from the sun. These reactants are used by plants and some other organisms.

The organism utilizes the reactants and produces molecules of sugar like glucose and by-product oxygen. These molecules are necessary for the metabolic and respiratory processes.

Therefore, option B. \(\rm sunlight + water + carbon\; dioxide \rightarrow oxygen + sugar\) is the correct equation that describes photosynthesis.

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The lakes having characteristics of being clean, high in DO, deep and receiving few nutrients are typically classified as "oligotrophic" lakes.

The lakes having characteristics of being clean, high in DO, deep and receiving few nutrients are typically classified as "oligotrophic" lakes. Oligotrophic lakes are generally low in nutrients and productivity, resulting in clear water, high oxygen levels, and limited biological productivity.

These  lakes are often deep and have a low rate of nutrient input, usually from sources such as rainfall or groundwater. The opposite of oligotrophic lakes is eutrophic lakes, which are high in nutrients and productivity, resulting in murky water, low oxygen levels, and high biological productivity.

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The maximum mass of MgO produced is 1.64 g.

The given equation is not balanced. Assuming the correct equation is:

Mg + H₂O → MgO + H₂

The balanced equation shows that 1 mole of Mg reacts with 1 mole of H₂O to produce 1 mole of MgO and 1 mole of H₂.

The molar mass of Mg is 24.31 g/mol, which means that 1.00 g of Mg is equal to 1.00 g / 24.31 g/mol = 0.0411 mol Mg.

According to the balanced equation, 1 mol of Mg produces 1 mol of MgO. Therefore, 0.0411 mol of Mg produces 0.0411 mol of MgO.

The molar mass of magnesium oxide is 40.31 g/mol, which means that 0.0411 mol of MgO is equal to 0.0411 mol × 40.31 g/mol

= 1.64 g of MgO.

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Answer:

For atoms of elements in the same group (except the last 2 columns of group VIIIB), what is the relationship between the group number and the valence electron?

Given :

A balanced chemical equation :

\(Zn +Cl_2->ZnCl_2\)

To Find :

How many grams of zinc are needed to produce 12 grams of zinc chloride.

Solution :

Moles of \(ZnCl_2\) ,

\(n=\dfrac{Given \ wt}{Molecular\ Mass}\\\\n =\dfrac{12}{136.30}\ mol\\\\n=0.088\ mol\)

Now, by balanced chemical equation we can say that 1 mol of Zn produce

1 mol of \(ZnCl_2\) .

So, 0.088 mol of Zn is required to produced 0.088 mol of \(ZnCl_2\) .

\(Mass \ required = molecular \ mass \times moles\\\\m = 65.38 \times 0.088\\\\m=5.8 \ gm\)

Therefore, 5.8 grams of zinc is required.

Hence, this is the required solution.

Answer:

c. 1.0 mole C5H5N and 1.5 mole C5H5NHCl

Explanation:

We can determine pH of a buffer using H-H equation:

pH = pKa + log [A⁻] / [HA]

Where [A⁻] is concentration of conjugate base and [HA] concentration of weak acid. These concentrations can be computed as moles of each species.

We need to determine pKa of both NH₃ and C₅H₅N buffers, thus:

pKb = -log Kb

NH₃ pKb = -log 1.8x10⁻⁵ = 4.74

C₅H₅N pKb = -log 1.7x10⁻⁹ = 8.77

And pKa = 14 - pKb:

NH₃ pKa = 14 - 4.74 = 9.26

C₅H₅N pKb = 14 - 8.77 = 5.23

A buffer works only under pH's between pKa-1 and pKa + 1. As pKa NH₃ buffer is 9.23 is not possible to produce a buffer with pH 5.05 for this system.

Thus, we only will compute the buffers made with C₅H₅N:

c. 1.0 mole C5H5N (Weak base) and 1.5 mole C5H5NHCl (Conjugate acid)

pH = pKa + log [A⁻] / [HA]

pH = 5.23+ log [1.0 moles] / 1.5 moles]

d. 1.5 mole C5H5N and 1.0 mole C5H5NHCl

pH = pKa + log [A⁻] / [HA]

pH = 5.23+ log [1.5 moles] / 1.0 moles]

Right solution is:

The removal of the alcohol seen in the conversion of the nasal decongestant pseudoephedrine to the illicit drug methamphetamine constitutes reduction process.

Redox is a type of chemical reaction in which the oxidation states of substrate change. Oxidation is the loss of electrons or an increase in the oxidation state, while reduction is the gain of electrons or a decrease in the oxidation state. The removal of the alcohol seen in the conversion of the nasal decongestant pseudoephedrine to the illicit drug methamphetamine constitutes reduction process. The “Birch method” is a chemical reduction reaction to convert pseudoephedrine in base form into methamphetamine. The “Red Phosphorous method” is a chemical reduction reaction utilizing red phosphorus/hydriodic acid chemistry to convert pseudoephedrine to methamphetamine.

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Answer:

10.77

Explanation:

The relationship between pH and pOH is

pH + pOH = 14

Plugging in the pOH makes

pH + 3.23 = 14

And solving for pH by subtracting 3.23 on both sides

pH = 10.77

220.035 grams of HNO3 are needed to make 700.0 mL of a 5.0 M solution.

To make 700.0 mL of a 5.0 M solution of HNO3, we need to calculate the number of moles of HNO3 required, then convert that to grams. We can use the formula: Molarity = moles of solute / liters of solution.We know that the molarity is 5.0 M and the volume is 700.0 mL.

To convert mL to L, we divide by 1000. So: 5.0 M = moles of HNO3 / (700.0 mL / 1000)Solving for moles of HNO3: moles of HNO3 = (5.0 M) x (700.0 mL / 1000) = 3.5 moles of HNO3. Then we can use the molar mass of HNO3 to convert moles to grams.

HNO3 molar mass is 63.01 g/mol. So, the number of grams of HNO3 required is: 3.5 moles x 63.01 g/mol = 220.035 g. Therefore, 220.035 grams of HNO3 are needed to make 700.0 mL of a 5.0 M solution.

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The concept molarity is an important method which is used to calculate the concentration of a solution. It is mainly employed to calculate the concentration of a binary solution. Here the grams of HNO₃ is 220.53 g.

The term molarity is defined as the number of moles of the solute present per litre of the solution. It is represented by using the letter 'M' and its unit is mol/L. The term molarity is also known as the molar concentration.

Molarity = Number of moles of the solute / Volume of the solution in litres

700.0 mL = 0.7 L

Number of moles  = Molarity × Volume of the solution

5.0 × 0.7 = 3.5

Number of moles = Mass / Molar mass

3.5 = m / 63.01

m = 220.53 g

Thus the mass in grams of HNO₃ is 220.53 g.

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Degenerate orbitals are orbitals that have the same energy level and are equivalent in their spatial distribution. They are often found in atoms with partially filled subshells or in molecules with similar electronic configurations.

Some characteristics of degenerate orbitals include:

Degenerate orbitals have the same energy: This means that electrons in degenerate orbitals have equal energy levels and cannot be distinguished from one another by their energy.

All orbitals belonging to the same atom are degenerate with respect to one another: This means that within an atom, all orbitals with the same energy level are degenerate.

Degenerate orbitals do not necessarily have the same shape and orientation: This means that orbitals with the same energy level can have different shapes and orientations, such as p orbitals in different directions.

Degenerate orbitals may or may not have the same number of electrons: This means that degeneracy is related to energy level rather than electron count.

Overall, the degeneracy of orbitals is an important concept in understanding electronic structure and chemical bonding.

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Answer:

d) Earth is more massive than Pluto.

Explanation:

The force of gravity is greater for an object orbiting the Earth than for the same object orbiting Pluto, because Earth is more massive than Pluto.

The common factor is that the greater the planet's mass, the greater its gravitational force acting on an object. Hence, the option (d) is the correct answer.

Answer:

Magnesium would be the metal

Explanation:

The heat involved in a physicochemical process follows the formula:

Q = m×C×ΔT

Where Q is heat involved,

m is mass of substance,

C is specific heat of the susbtance

And ΔT change in temperature

We can solve por specific heat of the solution:

C = Q / m*ΔT

Replacing the values of the problem:

C = 2090J / 40g*(81.7°C-30°C)

C = 1.01J/g°C

This specific heat is the specific heat of Magnesium. Thus:

Answer:

alcohol

Explanation:

In photosynthesis, carbon dioxide is reduced and H₂O is oxidized. The type of chemical reaction is Redox reaction.

Oxidation is the loss of electron and reduction is the gain of electrons. When in a reaction both oxidation and reduction occurs called as redox reaction.

oxidation :

2H₂O ---->   O₂   +   4H⁺

reduction :

4H⁺   +   6CO₂   ---->   CH₂O   +   6H₂O

overall reaction : redox reaction

CO₂   +   H₂O   ----->   (CH₂O)n   +   H₂O   + O₂

The photosynthesis equation is given as :

6CO₂   +   6H₂O   ----->   C₆H₁₂O₆   +    6H₂O   +   6O₂

Thus, In photosynthesis, carbon dioxide is reduced and H₂O is oxidized. The type of chemical reaction is Redox reaction.

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The reduction potential for the zinc half-reaction with copper as the reference electrode is -0.42 V.

To find the reduction potential for the zinc half-reaction with copper as the reference electrode, we need to use the Nernst equation:

Ecell = Eºcell - (RT/nF) ln(Q)

where Eºcell is the standard cell potential, R is the gas constant, T is the temperature, n is the number of electrons transferred in the cell reaction, F is the Faraday constant, and Q is the reaction quotient.

We know that the standard reduction potential for the zinc half-reaction is -0.76 V (with SHE as the reference electrode). To convert this to the potential with copper as the reference electrode, we need to add the standard reduction potential for the copper half-reaction:

\(\mathrm{Cu^{2+} + 2e^- \rightarrow Cu} \qquad E^\circ_{\mathrm{red}} = +0.34 , \mathrm{V}\)

We can then use the equation:

Eºcell (with Cu as the reference) = Eºcell (with SHE as the reference) + Eºred (for the copper half-reaction)

Eºcell (with Cu as the reference) = -0.76 V + 0.34 V = -0.42 V

Therefore, the reduction potential for the zinc half-reaction with copper as the reference electrode is -0.42 V.

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Answer:

Best  

Explanation:

physical, best, greatest.

Answer:

Explanation:

Suggestions:

Make sure all words are spelled correctly.

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Try more general keywords.

The given salt K4[Pt(CO3)2F2] is Potassium dicarbonatodifluoroplatinate (II) as per the IUPAC nomenclature.

The International Union of Pure and Applied Chemistry (IUPAC) developed the IUPAC nomenclature as a standard for naming organic molecules and compounds (IUPAC). Every chemical structure has a distinct, clear name thanks to its design. Each molecule or compound is given a name according to the IUPAC nomenclature depending on its structure.

In this case, the prefix "di" is utilized because the carbonate ion is acting as a monodentate ligand. If a bidentate ligand had been present, the prefix "bis" would have been used.

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In a permanent magnet, a magnetic field is produced by the composite motions of electrons in geometrically aligned atoms.

A magnetic field is characterized by poles called north and south. Magnetic polarity refers to the orientation of these poles in space.

Answer:

The polarity of a magnet usually means the direction of a vector which points from the south pole of the magnet toward the north pole. ... In this case the polarity is expressed in a way that indicates a circular direction, such as clockwise, or as a perpendicular vector representing the curl of the internal field.

Explanation:

Answer:

it decrease when a solution becomes more acidic which means that decrease in pH means increase..

Answer:

it's ph decreases.. meaning those with a small ph value are more acidic.forinstance one with a ph of 1 is more acidic than the one with a ph of 3.

I hope this helps

The mass of the solid sample is 2.539 g. Suppose you are measuring the mass of a solid sample on a balance using a weigh boat. you record the data in a table. mass of weigh boat 3.081 g mass of weigh boat and sample 5.620 g

To find the mass of the solid sample, you need to subtract the mass of the weigh boat from the combined mass of the weigh boat and the sample.
Step 1: Write down the given values:
Mass of weigh boat = 3.081 g
Mass of weigh boat and sample = 5.620 g
Step 2: Subtract the mass of the weigh boat from the combined mass:
Mass of solid sample = Mass of weigh boat and sample - Mass of weigh boat
Mass of solid sample = 5.620 g - 3.081 g
Step 3: Calculate the mass of the solid sample:
Mass of solid sample = 2.539 g
The mass of the solid sample is 2.539 g.

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A balanced chemical equation always obeys law of conservation of mass.

A  balanced chemical equation generally obeys to law of conservation of mass. As per this regulation the mass of items should be equivalent to the mass of reactants. A response is supposed to be adjusted when the complete mass of particles on the two sides of the substance response is equal.According to the law of conservation of mass, the mass of the items in a synthetic response should rise to the mass of the reactants.

The law of conservation of mass is helpful for various computations and can be utilized to tackle for obscure masses, such how much gas consumed or delivered during a reaction.They should submit to the Law of conservation of Mass that expresses that matter can't be made or obliterated, it is saved. The mass of the reactants should rise to the mass of the products.Thus, the mass of substances created in a synthetic response is consistently equivalent to the mass of responding substances. Consequently, you really want to have a similar number of each kind of component on each side of a synthetic condition. This is the entire reason for adjusting a synthetic condition.

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Answer:

The age of the sample is \(t \approx 6\times 10^{10}\,yr\). It is possible, since the definition of half-life is the time taken by the isotope to halve its mass.

Explanation:

All radioactive isotopes decays exponentially, the decay is represented by the following formula:

\(m(t) = m_{o}\cdot e^{-\frac{t}{\tau} }\) (1)

Where:

\(m_{o}\) - Initial mass of the isotope, measured in grams.

\(m(t)\) - Current mass of the isotope, measured in grams.

\(t\) - Time, measured in years.

\(\tau\) - Time constant, measured in years.

Now we clear the time of the isotope within the formula:

\(t = -\tau\cdot \ln \frac{m(t)}{m_{o}}\)

In addtion, the time constant can be calculated in terms of the half-life (\(t_{1/2}\)), measured in years:

\(\tau = \frac{t_{1/2}}{\ln 2}\) (2)

If we know that \(m_{o} = 2.5\,g\), \(m(t) = 1.25\,g\) and \(t_{1/2} = 6\times 10^{10}\,yr\), then the age of the isotope is:

\(\tau = \frac{6\times 10^{10}\,yr}{\ln 2}\)

\(\tau \approx 8.656\times 10^{10}\,yr\)

\(t = -(8.656\times 10^{10}\,yr)\cdot \ln \frac{1.25\,g}{2.5\,g}\)

\(t \approx 6\times 10^{10}\,yr\)

The age of the sample is \(t \approx 6\times 10^{10}\,yr\). It is possible, since the definition of half-life is the time taken by the isotope to halve its mass.

Answer: fixed shape and volume

Explanation:

i took the quiz so its right