using the henderson-hasselbalch equation, calculate the mass of sodium acetate (dry) and volumes of glacial acetic acid (liquid) and dh2o you would need to prepare 50 ml of 0.2 m acetate buffer, ph 4.5.

Option C is the appropriate response. In the third energy level of an element with five electrons, the electron configuration is 1s22s22p63s23p3. This is so because the third energy level, 2p, can only contain a maximum of six electrons while the first two energy levels, 1s and 2s, can each hold two electrons.

Accordingly, two  electrons in the 3s orbital and two electrons in the 3p orbital combine to fill the final four electrons in the third energy level. The symbol for this is 1s22s22p63s23p3.

Because Option A has an additional electron in the third orbital, Option B has an extra electron in the third orbital, and Option D has an extra electron in the second orbital, those other possibilities are erroneous.

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Answer:

D

Explanation:

Does not require energy ...may be slow or fast....

The average rate of a reaction is equal to its instantaneous rate at a given second when the time interval being considered is very small, approaching zero.

In this case, the instantaneous rate represents the exact rate of the reaction at that specific moment, and the average rate over the small time interval becomes equivalent to the instantaneous rate. The average rate of a reaction is calculated over a period of time, while the instantaneous rate refers to the rate of the reaction at a specific moment in time. The two rates can be equal if the reaction is proceeding at a constant rate throughout the time interval being considered. In other words, if the rate of the reaction does not change significantly over the time period, then the average rate will be approximately equal to the instantaneous rate at any given second during that period. However, if the rate of the reaction is changing rapidly over the time period, then the average rate and instantaneous rate may be significantly different.

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pH is a measure of the acidity or basicity of a solution. It is defined as the negative logarithm of the concentration of hydrogen ions (H+) in a solution.

A solution with a pH of 7 is considered neutral, while solutions with a pH below 7 are considered acidic and those above 7 are considered basic or alkaline. The pH scale is logarithmic, meaning that a change of one pH unit represents a tenfold change in the concentration of H+. The pH of a solution can be measured using a pH meter or indicator paper, and it is an important parameter in various chemical and biological processes, such as enzyme activity, drug solubility, and nutrient uptake by plants.

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Answer:

8.68 L is the new volume

Explanation:

You use Boyle's law for this.

\(P_{1}V_{1}=P_{2}V_{2}\)

\(P_{1}\) = first pressure

\(P_{2}\) = second pressure

\(V_{1}\) = first volume

\(V_{2}\) = second volume

Convert pressure from atm to mmHg (use same units):

5.97 x 760 = 4537.2 -> 4.54 x 10³

...maintain 3 significant figures in calculation, and round as needed...

(4.54 x 10³ mmHg)(2.79 L) = (1460 mmHg)(\(V_{2}\))

(4.54 x 10³ mmHg)(2.79 L) / (1460 mmHg) = \(V_{2}\) = 8.68 L

Hope this helps :)

Answer:

Explanation:

Density of a substance is given by

From the question

mass of the wood = 180 g

Since the wood is a cuboid we can find the volume using the formula

Volume = length × width × height

From the question

length = 10cm

width = 6 cm

height = 4 cm

Volume = 10 × 6 × 4 = 240 cm³

Substitute the values into the above formula and solve for the Density

That's

We have the final answer as

Hope this helps you

The term mole concept is used here to determine the mass of butane. The mass of butane needed to produce 47.6 grams of H₂O is 30.68 g.

One mole of a substance is defined as that quantity of it which contains as many entities as there are atoms exactly in 12 g of carbon - 12. The formula used to calculate the number of moles is:

Number of moles = Given mass / Molar mass

Here the balanced equation is:

2 C₄H₁₀ + 13 O₂ --> 8 CO₂ + 10 H₂O

From the equation, we can see that 10 moles of H₂O are produced for every 2 moles of C₄H₁₀ used. We can use this ratio to convert the given mass of H₂O to the corresponding mass of C₄H₁₀.

mass of H₂O = 47.6 g

moles of H₂O =  47.6 g / 18.02 g/mol = 2.64 mol

moles of C₄H₁₀ = (2.64 mol H₂O) / (10 mol H₂O / 2 mol C₄H₁₀) = 0.528 mol C₄H₁₀

molar mass of C₄H₁₀ = 58.12 g/mol

mass of C₄H₁₀ = 0.528 mol x 58.12 g/mol ≈ 30.68 g

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Answer:

Explanation:

A lever is a simple machine that can be used to increase the force or distance of an applied effort. The three main parts of a lever are the fulcrum, resistance arm, and effort arm.

The mechanical advantage of a lever depends on the ratio of the length of the effort arm to the length of the resistance arm. A longer effort arm will require less force to lift a load, but will require more distance to be moved. Conversely, a shorter effort arm will require more force to lift a load, but will require less distance to be moved.

Answer:

malleable

Explanation:

The image represent in malleable property of metal.

The image possibly represents the photoelectric effect of a metal, which is when it emits electrons after being exposed to electromagnetic radiation. Metals are also characterized by physical properties such as conductivity, malleability, metallic luster, and metallic bonding.

Based on your question, the image possibly represents the photoelectric effect, a key property of metals. This phenomenon occurs when a metal surface exposed to electromagnetic waves of a certain frequency absorbs radiation and emits electrons. These emitted electrons are called photoelectrons. Metals can also exhibit free electron model behavior, where electrons freely roam within the metal structure.

Metals possess unique physical properties like conductivity, malleability, and metallic luster. Malleability refers to the metal's ability to deform without breaking, while conductivity refers to the metal's ability to transfer heat or electricity. A metallic luster gives metals their characteristic shiny appearance.

Finally, metals are also known for their metallic bonding—a unique force that holds together the atoms within a metallic solid. Metallic bonding gives rise to many useful and varied bulk properties of metals.

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(A) A student measured the boiling point of water to be 209°F . the accepted value is 212°F. the absolute error is  3°F   and the percent error is 1.41 5

(B) a bowling ball weighs 8 lbs. you decide to test your bathroom scale and you measure that ball weighing 7.35 lbs . the absolute error is 0.65lbs  and the percent error is 8.12 %

(A) The actual value = 212°F and The observed value = 209°F

     The absolute error = | actual value - observed value |

                                     =  |  212 °F - 209 °F |

                                     =  3 °F

percent error = ( | actual value - observed value | /actual value ) × 100 %

                       = ( 3 / 212 ) × 100 %

                       =  1.41 %

(B) The actual  value = 8 lbs

    The observed value = 7.35 lbs

The absolute error = | actual value - observed value |

                                = | 7.35 - 8 |

                               = 0.65 lbs

percent error = ( | actual value - observed value | /actual value ) × 100 %

                      = ( 0.65 / 8 ) × 100%

                      = 8.12 %

Thus, (A) A student measured the boiling point of water to be 209°F . the accepted value is 212°F. the absolute error is  3°F   and the percent error is 1.41 %

(B) a bowling ball weighs 8 lbs. you decide to test your bathroom scale and you measure that ball weighing 7.35 lbs . the absolute error is 0.65 lbs    and the percent error is 8.12 %

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Answer:

Valence electrons

Explanation:

The formation of phosphorus trifluoride is orchestrated by the sharing of the valence electrons between phosphorus and fluorine.

This is called covalent bonding. In covalent bonding, elements with zero or very small electronegativity combines together. Such bonding occurs between non-metals.

For this bond to form, phosphorous shares its 5 electrons with the 3 of the fluorine.

Answer:

a dissolved substance especially or a component of a solution present in smaller amount than the solvent

Explanation:

have a good day

Answer:

A solute is a minor component in a solution, this is dissolved in the solvent.

Explanation:

We can measure the volume of a liquid by using the graduated cylinder and the SI unit which is used for the liquid volume is cubic meter (m3).

Simply we can find or measure the volume of a liquid by using either a graduated cylinder or with the help of the burette. As this is clear from the name of the graduated cylinder is that cylinder in which we can measure the volume of a liquid. The graduated cylinder is sealed from one end and opened from the other side. The scales are also drawn on the graduated cylinder for finding the values.

The SI unit which is used for the liquid volume is called a cubic meter (m3). It is a derived unit. Liter (L) is a special name for the cubic decimeter (dm3). The symbol for the liter is the uppercase letter “ell” (L) is desired to keep away from the danger of misunderstanding among the lowercase letter “ell” (l) and the number one (1).

So we can conclude that graduated cylinder is used for measuring the volume of a liquid and the liquid volume is cubic meter (m3).

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To prepare 5 L of a mouthwash containing 0.1% of ZnCl2,you would need approximately 0.014 grams (or 14.5 mg) of zinc chloride.

The percentage concentration of ZnCl2 in the mouthwash is given as 0.1%. This means that for every 100 parts of the mouthwash, 0.1 parts are ZnCl2.

To calculate the amount of ZnCl2 needed to prepare 5 L of mouthwash, we can use the following formula:

Amount of ZnCl2 = (Percentage concentration/100) × Volume of mouthwash

Plugging in the values, we have:

Amount of ZnCl2 = (0.1/100) × 5 L = 0.005 L

Since the density of ZnCl2 is approximately 2.907 g/mL, we can convert the volume to grams:

Amount of ZnCl2 = 0.005 L × 2.907 g/mL = 0.014535 g

Rounding off to the appropriate number of significant figures, the amount of ZnCl2 needed is approximately 0.0145 g, which can be rounded to 0.014 g.

To prepare 5 L of a mouthwash containing 0.1% of ZnCl2, you would need approximately 0.014 grams (or 14.5 mg) of zinc chloride.

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Using the change of base rule to find the logarithm to four decimal places. the correct answer is 11.4235.

To find the logarithm of 143.2 using the change of base rule, we can choose any base we prefer. Let's use base 10 and natural logarithm (base e) for this calculation.

First, we'll use the change of base formula, which states that log(base b) x = log(base c) x / log(base c) b. In this case, we'll calculate log(base 10) 143.2.

We'll use the natural logarithm (ln) as our intermediary step. The natural logarithm of 143.2 can be calculated as ln(143.2).

Using a calculator, we find that ln(143.2) is approximately 4.9628.

Next, we need to calculate log(base 10) e, which is the logarithm of e with base 10. Using a calculator, we find log(base 10) e is approximately 0.4343.

Finally, we apply the change of base formula:

log(base 10) 143.2 ≈ ln(143.2) / log(base 10) e
                ≈ 4.9628 / 0.4343
                ≈ 11.4235

Rounding to four decimal places, the logarithm of 143.2 using base 10 is approximately 11.4235.

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The freezing point of the solution is -2.67° C.

Depression in freezing point = i ×Kf × m.

i for FeCl3 = 3 .

Kf for water = 1.86 K. Kg/mol.

Molar mass of FeCl3 = 162.2 g / mol .

Moles of FeCl3 = 13.1 / 162.2 = 0.08 mol.

Molality = 0.08/ 0.166 = 0.48 mol / kg .

Freezing point =0 - depression in freezing point = - 3 × 1.86 × 0.48

⇒ - 2.67° C.

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The empirical rule states that, for data having a bell-shaped distribution, the portion of data values being within one standard deviation of the mean is approximately 95 percentage.

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Answer:

The answer is 26.03728. We assume you are converting between grams C2H2 and mole. You can view more details on each measurement unit: molecular weight of C2H2 or mol This compound is also known as Acetylene. The SI base unit for amount of substance is the mole.

Explanation:

The solution is 26.03728. We assume you are converting between grams C2H2 and mole. You could view more information on each size unit: molecular weight of C2H2 or mol This compound is also called Acetylene. The SI base unit for the quantity of the substance is the mole.

The C2H2 molecule is product of sigma-bonds and pi-bonds, with a bond attitude of one hundred eighty ranges. This linear molecular geometry is similar to that of CO2 (Carbon dioxide), which is likewise a non-polar compound.

C2H2 has a linear molecular geometry because all the atoms are symmetrically aligned inside the same aircraft. Both Carbon atoms are inside the centre of the C2H2 Lewis structure due to the fact they may be much less electronegative than Hydrogen atoms.

The chemical formulation for acetylene is C2H2 and the chemical composition for carbon monoxide is CO. There are 2 carbon atoms in every acetylene molecule and 1 carbon atom in every carbon monoxide molecule. In each mol of any chemical substance, there are 6.022*10^23 molecules.

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Answer:

producer and consumer

since the The caterpillar will later evolve and develop into a cocoon.

The cocoon will evolve into a butterfly and hence the organism will grow and develop.

Being a herbivorous animal the caterpillar represents consumer and plant is a producer.

The caterpillar also helps in rearing silk hence they are producers and consumers also

Answer:

16.00 mL

Explanation:

Permanent retrievable storage is extremely expensive and is usually reserved for highly hazardous and long-lasting materials such as spent uranium fuel rods and dioxins. These materials require special handling and containment due to their radioactive and toxic properties.

When it comes to spent uranium fuel rods, they are the byproduct of nuclear power generation. These rods contain highly radioactive elements, such as plutonium and uranium, which have long half-lives and remain hazardous for thousands of years. Therefore, they must be stored in a secure and controlled environment to prevent any release of radiation into the environment.

Similarly, dioxins are highly toxic organic compounds that are produced as byproducts of certain industrial processes, such as waste incineration. They are persistent organic pollutants and can accumulate in the environment, posing significant health risks to humans and wildlife. As a result, their storage requires careful handling and monitoring to prevent contamination and potential harm.

Given the unique nature and long-term risks associated with these materials, permanent retrievable storage facilities are designed to ensure their safe containment and isolation. These facilities are built to meet strict safety standards, including multiple layers of containment and monitoring systems, to prevent any release of hazardous materials. However, due to the high costs involved in constructing and maintaining such facilities, permanent retrievable storage is typically reserved for the most dangerous and persistent materials.

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The charge qₑₙ contained within the Gaussian cylinder is equal to the net charge enclosed by the cylinder.

In the context of Gauss's Law in electromagnetism, a Gaussian cylinder is an imaginary surface used to apply the law. Gauss's Law states that the electric flux through a closed surface is proportional to the net charge enclosed by that surface.

The charge qₑₙ enclosed within the Gaussian cylinder can be determined by calculating the integral of the electric field over the surface of the cylinder. This integral represents the electric flux passing through the surface, which is proportional to the net charge enclosed.

To find the value of qₑₙ, you need to evaluate the integral of the electric field over the surface of the Gaussian cylinder. The result will be the net charge enclosed by the cylinder.

By using Gauss's Law and properly considering the symmetry and characteristics of the electric field, you can determine the charge qₑₙ enclosed within the Gaussian cylinder for a given distribution of charges.

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Answer:

plasma flows but is a solid

Explanation:

example toothpaste flows but is a solid

Answer:

Intensive

Explanation:

The electrical conductivity of a wire depends on its composition, not the length of the wire.

Hope this helps! If correct pls mark brainliest :)

As copper wire was very thin, it will have great electrical conductance and copper wire has a intensive property.

         The electrical resistance of a wire is given by

                                R = ρl/A.

where,

R -Resistivity of the material,

l - length of the wire,

A - cross-sectional area of the wire

As we know the formula, it can be explained as:

Hence, we came to know that, thin wires have a greater electrical resistance than a  thick wire.

So, copper wire was very thin and it can conduct electricity.

Here, concluded that copper wire was very thin and it has intensive property.

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Explanation:

Avogadro's number. What can be said about 1 mol Ag and 1 mol Au? ... They contain the same number of atoms.

1 mole of Ag and 1 mole of Au contain the same number of particle. Therefore, option B is correct.

The International System of Units uses the mole (symbol: mol) as the unit of material quantity. How many elementary entities of a particular substance are present in an object or sample is determined by the quantity of that material. It is specified that the mole contains exactly 6.022140761023 elementary entities.

A mole is defined as the mass of a substance that has the same number of elementary particles as there are atoms in precisely 12.000 g of 12C.

In the periodic chart, group 11 includes the chemical elements roentgenium (Rg), copper (Cu), silver (Ag), and gold (Au). However, no chemical tests have yet been done to demonstrate that roentgenium behaves similarly to the heavier homologue of gold.

Thus, option B is correct.

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Answer:Sulfur

Hope this helps!

Explanation:

Answer:

8 kg mass

Explanation:

As we can see in the image the weight of mass 8 kgs has a large surface area as compared to the surface area of other masses. In general, it has been observed that a wide surface area has more surface particle for heat conduction. Hence, the rate of heat transfer is directly proportional to the surface area of heat conducting surface. Thus, the larger the surface area, the faster is the rate of heat conduction.

Hence, weight of mass 8Kg wil transfer heat a fast rate.