calculate ph of buffer formed by mixing 85ml of .13m lactic acid with 95ml of .15m sodium lactate

Answer:

2.12atm

Explanation:

Boyle's Law: P1V1 = P2V2

Manipulate to solve for unknown: P2 = P1V1/V2

Substitute values:  P2=(1.2atm)(4.6L)/2.6L

P2 = 2.1230769atm

Round to 3 sig figs to get 2.12atm

Answer:(c)

Explanation:

Answer:l ectrons will occupy a p orbital only after the s orbital is full

Explanation: Electrons can begin to occupy energy levels with the next highest integer designation only after all of the orbitals on the energy level below it are occupied.

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Combustion, breakdown, single-replacement, double-replacement, and combinations are the five fundamental types of chemical reactions.

Scientists have for the first time compiled a global inventory of more than 350,000 chemicals and chemical mixes that are authorized for commercial manufacturing and usage, which is up to three times the number typically assumed.

Sulfuric acid, also referred to as H2SO4, is the chemical that is most frequently manufactured worldwide. The majority of the time, it is utilized in fertilizers, but it is also present in many industrial cleaning products.

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A lists with only essential trace elements is (d) boron, copper, iodine, selenium, manganese

Boron is involved in maintaining healthy bones and joints, as well as supporting cognitive functions. Although the exact mechanisms of its action are not fully understood, boron is believed to influence the metabolism and utilization of calcium, magnesium, and vitamin D.

Copper is an essential trace element involved in the formation of red blood cells, connective tissues, and the functioning of several enzymes. It plays a role in iron metabolism, assisting in the absorption, transport, and utilization of iron in the body. Copper is also important for antioxidant defense, as it is a component of enzymes involved in neutralizing harmful free radicals.

Iodine is a vital trace element necessary for the synthesis of thyroid hormones. Thyroid hormones regulate metabolism, growth, development, and the functioning of various organs and tissues. Iodine deficiency can lead to thyroid disorders, such as goiter and hypothyroidism.

Selenium is an essential trace element with antioxidant properties. It is a component of selenoproteins, which act as antioxidants, help regulate thyroid hormone metabolism, and play a role in immune function. Selenium deficiency can impair immune function and increase the risk of certain diseases.

Manganese is involved in numerous enzymatic reactions in the body. It plays a role in carbohydrate, amino acid, and cholesterol metabolism. Manganese is also necessary for the synthesis of connective tissues and bone formation. Additionally, it functions as a cofactor for several antioxidant enzymes.

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Answer:

CaKr Na2S BaCl3 MgF. CaKr-Kr is a noble gas Na2S-not balanced BaCl3-not balanced MgF-not balanced.

Explanation:

The CaKr is  compound which is likely to form because its charge will be balanced.

A chemical compound is referred to as a substance made up of several similar molecules linked together with chemical bonds and containing atoms from multiple elements. A molecule made up of only one element's atoms is hence not a compound.

It gains charge when electrons are transferred between each other. When the count of protons is higher than the count of electrons, the charge is positive.

Ca has 1 charge and Kr has also 1 charge. hence, CaKr will form as a compound. The charge of  \(Na_{2}S, BaCl_{3}\) and MgF is not balanced that's why they can not form compound.

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0.123 mol of methane contains 7.4 x 1022 molecules of methane (ch4). Four hydrogen atoms are joined to the one carbon atom that makes up the molecule methane by single bonds.

It is a gas that is combustible, colourless, odourless, non-toxic, and has a melting point of -161°C. It serves as a fossil fuel, greenhouse gas, and bacterial metabolite, among other things. Avogadro's number refers to the fact that a mole of methane really consists of 6.0221023 molecules. To calculate the required number of molecules, find the substance's molecular weight for one mole. Next, multiply the result by the Avogadro constant after dividing the molar mass value by the molecular mass.

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The expected blood gas values for this patient at the time of admission of patient is option E. pH 7.51; PaCO₂ = 20 mm Hg; [HCO₃]⁻ = 24 mEq/L; Anion Gap = 12 mEq/L

A 20-year-old woman presents to the Emergency Department with persistent symptoms of palpitations, dizziness, sweating, and paresthesia. She has a history suggestive of an anxiety disorder.

To assess her condition, blood gases and electrolytes are ordered, and a positron emission tomography (PET) scan is performed. The PET scan reveals increased perfusion in the anterior portion of each temporal lobe. Based on these findings, the doctor prescribes a benzodiazepine medication.

The expected blood gas values at the time of admission can be determined by analyzing the given options:

A. pH 7.51; PaCO₂ = 49 mm Hg; [HCO₃]⁻ = 38 mEq/L; Anion Gap = 12 mEq/L

B. pH 7.44; PaCO₂ = 25 mm Hg; [HCO₃]⁻ = 16 mEq/L; Anion Gap = 12 mEq/L

C. pH 7.28; PaCO₂ = 60 mm Hg; [HCO₃]⁻ = 26 mEq/L; Anion Gap = 12 mEq/L

D. pH 7.28; PaCO₂ = 20 mm Hg; [HCO₃]⁻ = 16 mEq/L; Anion Gap = 25 mEq/L

E. pH 7.51; PaCO₂ = 20 mm Hg; [HCO₃]⁻ = 24 mEq/L; Anion Gap = 12 mEq/L

By evaluating the options, the most appropriate choice is:

E. pH 7.51; PaCO₂ = 20 mm Hg; [HCO₃]⁻ = 24 mEq/L; Anion Gap = 12 mEq/L

This option presents a higher pH (alkalosis) and a decreased PaCO₂ (respiratory alkalosis), which could be consistent with the patient's symptoms of hyperventilation due to anxiety. The [HCO₃]⁻ level within the normal range and a normal anion gap further support this interpretation.

In summary, the expected blood gas values for this patient at the time of admission are a higher pH, decreased PaCO₂, normal [HCO₃]⁻, and a normal anion gap, indicative of respiratory alkalosis likely caused by hyperventilation related to her anxiety disorder.

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Given data:H2O vapor content: 13 gramsH2O vapor capacity: 52 grams at 25 degrees Celsius 13 grams at 10∘C52 grams at 30∘CFormula used to find the dew point:$$\dfrac{13}{52}=\dfrac{(A*3\pi)/(ln100)}{(17.27-A)}$$$$\frac{1}{4}=\dfrac{(A*3\pi)/(ln100)}{(17.27-A)}$$

Where A is the constantDew Point:It is the temperature at which air becomes saturated with water vapor when the temperature drops to a point where dew, frost or ice forms. To solve this question, substitute the given data into the formula.$$13/52=\dfrac{(A*3\pi)/(ln100)}{(17.27-A)}$$$$13(17.27-A)=3\pi A(ln100)$$By simplifying the above expression, we get$$A^2-17.27A+64.78=0$$Using the quadratic formula, we get$$A=9.9,7.4$$

The dew point is 7.4 since it is less than 10°C.More than 100:The term "More than 100" has not been used in the question provided.

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Answer:

See explanation

Explanation:

The laboratory provides a controlled environment for scientific studies. In the field, it is more difficult to control extraneous variables. Extraneous variables are other variables which are not the independent variable but could inadvertently affect the dependent variable.

Extraneous variables are better controlled in the secluded environment of a laboratory better than they could be controlled in the field. This makes it more difficult to have control variables in the field than it is to have them in the laboratory. Recall that control variables are variables that must remain unchanged throughout the study.

The oscillation of the oxygen atom occurs with frequency fo = 3.7 × 10¹³ Hz when oxygen atom replace to sulfur the frequency of sulfur is 2.7 × 10¹³ Hz.

The frequency expression is given as :

F = ( 1/ 2π ) × √(k/m)

or F² m =  k / 4π²

now. if oxygen atom is replaced by the sulfur atom:

(F² m) oxygen = ( F² m) sulfur

F sulfur = F oxygen × √ (m oxygen / m sulfur)

F sulfur = 3.7 × 10¹³  × √ 16 / 32

F sulfur = 2.7 × 10¹³ Hz.

Thus, An oxygen atom at a particular site within a DNA molecule can be made to execute simple harmonic motion when illuminated by infrared light. the oxygen atom is bound with a spring-like chemical bond to a phosphorus atom, which is rigidly attached to the DNA backbone. the oscillation of the oxygen atom occurs with frequency fo = 3.7 × 10¹³ Hz when oxygen atom replace to  sulfur atom the frequency of sulfur is 2.7 × 10¹³ Hz.

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To calculate the empirical formula of a compound, you need to know the mass of each element in the compound and the molar mass of each element.

Calculate the number of moles of each element in the compound.

Divide the number of moles of each element by the smallest number of moles.

Convert the results to whole numbers by multiplying by the smallest whole number that will do so.

In this case, we have the following information:

Mass of sodium = 58.87 g

Mass of sulfur = 41.13 g

Molar mass of sodium = 22.99 g/mol

Molar mass of sulfur = 32.06 g/mol

Step 1: Calculate the number of moles of each element in the compound.

Code snippet

Number of moles of sodium = (58.87 g) / (22.99 g/mol) = 2.56 mol

Number of moles of sulfur = (41.13 g) / (32.06 g/mol) = 1.28 mol

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Step 2: Divide the number of moles of each element by the smallest number of moles.

Mole ratio of sodium:sulfur = 2.56 mol / 1.28 mol = 2

Step 3: Convert the results to whole numbers by multiplying by the smallest whole number that will do so.

The smallest whole number that will divide 2 evenly is 2.

Therefore, the empirical formula of the compound is Na2S.

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The method used to convert measurements in one unit to their equivalent in a second unit is called the conversion method.

The process of converting one unit of measurement to another unit of measurement is referred to as unit conversion.

For example, converting kilometers to miles, liters to gallons, and so on. When we measure something, we can use a variety of units to describe the amount of something. However, converting these measurements can sometimes be challenging, especially if they use different units of measurement.

Converting units of measurement can be done in a variety of ways, but the most common method is using conversion factors. Conversion factors are ratios that indicate how much of one unit is equal to another unit. They are typically expressed in the form of fractions, with the unit being converted in the numerator and the unit being converted to in the denominator.

For instance, to convert kilometers to miles, you would use the conversion factor 1 kilometer = 0.621371 miles.

This means that one kilometer is equal to 0.621371 miles.

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ANSWER:

moles CO2 = 88 mol

EXPLAIN:

In order to go from molecules of CO2 to moles of CO2, we have to use the following relationship:

I usually set up dimensional analysis questions like this:

Quantity sought = Quantity given x conversion factor

Now we just plug the values into the format I have above (make sure your units cancel out as you are going through this process, that's how you know if you are doing the calculations correctly or not):

moles CO2 = 5.3×10∧25 molecules×1mol/6.02×10∧23 molecules

moles CO2 = 88 mol

There are approximately 0.000486 moles of hydrogen present in the sample.

To find the number of moles of hydrogen present in the sample, you need to use the ideal gas law equation, which is PV = nRT where P is the pressure of the gas (in atm), V is the volume of the gas (in L), n is the number of moles of gas, R is the ideal gas constant, and T is the temperature of the gas (in K). First, you need to convert the pressure from torr to atm. You can do this by dividing the pressure in torr by 760, since 1 atm is equal to 760 torr. In this case, the pressure in atm would be: P = 764.5 torr / 760 = 1.0059 atm Next, you need to convert the volume from ml to L. You can do this by dividing the volume in ml by 1000, since 1 L is equal to 1000 ml. In this case, the volume in L would be: V = 30.42 ml / 1000 = 0.03042 L Finally, you need to convert the temperature from degrees Celsius to Kelvin. You can do this by adding 273.15 to the temperature in Celsius. In this case, the temperature in K would be:T = 25.58 degrees Celsius + 273.15 = 298.73 K Now that you have all the necessary values, you can plug them into the ideal gas law equation to solve for the number of moles of hydrogen: n = (PV) / (RT) = (1.0059 atm * 0.03042 L) / (8.31 J/mol*K * 298.73 K) = 4.86 x 10^-4 mol Therefore, there are approximately 0.000486 moles of hydrogen present in the sample

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The specific heat of the metal is 0.30J/g°C.

The specific heat capacity is defined as the quantity of heat (J) absorbed per unit mass (kg) of the material when its temperature increases 1 K (or 1 °C), and its units are J/(kg K) or J/(kg °C).

Step 1: Data given

Mass of metal = 75.0 g

Temperature of the metal = 65°C

Mass of water = 100.0 g

Temperature of the water = 20.0°C

Final temperature of the water = 22.3 °C

The specific heat of water is 4.184 J/g°C

Step 2: Calculate the specific heat of metal

Qlost = -Qgained

Q= m xCxΔT

Qmetal = -Qwater

m(metal) x c(metal) x ΔT(metal) = - m(water) x c(water) x ΔT(water

⇒m(metal) = the mass of metal = 75.0 g

⇒c(metal) = the specific heat of the metal = ?

⇒ΔT = The change of temperature = 22.3 - 65°C = -42.7 °C

⇒m(water) = the mass of water = 100.0 g grams

⇒c(water) = the specific heat of water = 4.186 J/g°C

⇒ΔT(water) = T2 - T1 = 22.3 - 20.0 = 2.3 °C

75.0 g x c(metal) x -42.7 °C= -100.0 g x  4.186 x 2.3

75.0 g x c(metal) x -42.7 °C = −962.78

c(metal) = 0.3006338798J/g°C =0.30J/g°C

The specific heat of the metal is 0.30J/g°C.

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Answer:

P2 = 2.25 atm

Explanation:

Given:

V1 = 1.5 L. V2 = 2.0 L

P1 = 3.0 atm. P2 = ?

Use Boyle's law and solve for P2:

P1V1 = P2V2

or

P2 = (V1/V2)P1

= (1.5 L/2.0L)(3.0 atm)

= 2.25 atm

The binding of the amino acid in aminoacyl-tRNA involves the formation of an ester bond.  Option b

Aminoacyl-tRNA is a complex molecule that plays a crucial role in protein synthesis. It consists of a tRNA molecule covalently linked to an amino acid. The amino acid is attached to the 3' end of the tRNA molecule through an ester bond.

An ester bond is formed between the carboxyl group (-COOH) of the amino acid and the hydroxyl group (-OH) of the ribose sugar at the 3' end of the tRNA molecule. This ester bond is also referred to as an ester linkage. The formation of the ester bond is catalyzed by the enzyme aminoacyl-tRNA synthetase.

The ester bond in aminoacyl-tRNA is essential for protein synthesis. During translation, the aminoacyl-tRNA molecule carries the specific amino acid to the ribosome, where it is incorporated into the growing polypeptide chain. The ester bond is later hydrolyzed, releasing the amino acid for further use in protein synthesis.

In summary, the binding of the amino acid in aminoacyl-tRNA involves the formation of an ester bond between the carboxyl group of the amino acid and the hydroxyl group of the ribose sugar in the tRNA molecule.

Option b

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Without knowing the specific values of the Rf values for sample A and B, it is difficult to draw a definitive conclusion about the intermolecular forces (IMFs) both samples have for the eluent and paper.

However, in general, the Rf value is influenced by the intermolecular forces between the compound being separated and the stationary phase (in this case, the paper) as well as the intermolecular forces between the compound being separated and the mobile phase (in this case, the eluent). A higher Rf value indicates that the compound is more soluble in the mobile phase and has weaker interactions with the stationary phase.

Therefore, if sample A has a higher Rf value than sample B, it suggests that sample A has weaker intermolecular forces with the stationary phase and stronger intermolecular forces with the mobile phase than sample B. Conversely, if sample B has a higher Rf value than sample A, it suggests that sample B has weaker intermolecular forces with the mobile phase and stronger intermolecular forces with the stationary phase than sample A.

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The energy of the photon is 3.7 * 10^-19 J while the energy of one mole of the photon is  6.1 * 10^-43 J/mol.

We know that the energy of the photon is the energy that can be obtained from just a mole of the photons that were emitted. Now we are told that what we have is a mixture of argon and mercury vapor used in advertising signs emits light of wavelength 530 nm.

Given;

E = hc/λ

E = energy

h = Plank's constant

c =  Speed of light

λ = wavelength

E = 6.6 * 10^-34 * 3 * 10^8/530 * 10^-9

E =3.7 * 10^-19 J

For one mole of the photon;

3.7 * 10^-19 J * 1 photon/6.02 * 10^23

= 6.1 * 10^-43 J/mol

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Answer:

In a physical change the appearance or form of the matter changes but the kind of matter in the substance does not. However in a chemical change, the kind of matter changes and at least one new substance with new properties is formed.

Answer:

Water is a remarkable substance, and its unique properties are largely due to the presence of polar covalent bonds and hydrogen bonds in its structure. These characteristics play a crucial role in the physical and chemical properties of water, making it essential for life as we know it.

Explanation:

The polar covalent bonds in water arise from the unequal sharing of electrons between oxygen and hydrogen atoms. This results in the oxygen atom having a partial negative charge (δ-) and the hydrogen atoms having partial positive charges (δ+). These charges create polarity within the water molecule, leading to the formation of hydrogen bonds.

Hydrogen bonds occur when the partially positive hydrogen atom of one water molecule is attracted to the partially negative oxygen atom of another water molecule. These hydrogen bonds are relatively weak individually, but when present in large numbers, they contribute to the cohesion, surface tension, and high boiling point of water.

The importance of these bonds is manifold. The cohesion between water molecules due to hydrogen bonding enables water to form droplets, have a high surface tension, and flow freely, facilitating transport within organisms and in the environment. Additionally, hydrogen bonding leads to the high specific heat capacity and heat of vaporization of water, making it an effective regulator of temperature in living organisms and ensuring stable environmental conditions.

Furthermore, hydrogen bonds play a crucial role in the unique properties of water as a solvent. The polar nature of water allows it to dissolve a wide range of substances, including ionic compounds and polar molecules, facilitating various biological processes such as nutrient transport and chemical reactions in cells.

Answer:

potassium.

Explanation:

located at start of period 3, will have larger radius

Answer:

bromine

Explanation:

When comparing peer-to-peer (P2P) apps and services, the most important factors to consider can vary depending on individual needs and preferences. However, in general, factors such as security, user interface, ease of use, fees, availability in different countries, and customer support are often considered more important than the color scheme or design of the app.

Security measures are crucial, as users want to ensure that their transactions are protected from fraud or hacking. User interface and ease of use are also important, as users want to be able to easily navigate the app and perform transactions without difficulty. Fees can vary between different P2P services, so users may want to compare these to determine which service is most cost-effective. Availability in different countries can also be a key factor for users who need to send or receive money internationally. Finally, good customer support is important to ensure that any issues or questions can be quickly addressed.

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Claim: The separation of Mesosaurus fossils can be explained by the continental drift hypothesis. Evidence: Fossil Distribution, Geological Similarities, Matching Climate and Habitat. The distribution of Mesosaurus fossils across South America and Africa, the geological similarities between these regions, and the matching climate and habitat conditions all support the claim that the separation of Mesosaurus populations can be explained by the process of continental drift.

Claim: The separation of Mesosaurus fossils can be explained by the continental drift hypothesis.

Evidence:

Fossil Distribution: Mesosaurus fossils are found in both South America and Africa. This distribution aligns with the hypothesis of continental drift, which suggests that these continents were once connected and later separated. The similarity in fossil remains on different continents supports the claim that Mesosaurus populations were separated when the continents drifted apart.

Geological Similarities: The geological formations and sedimentary layers in which Mesosaurus fossils are found in South America and Africa display remarkable similarities. This similarity implies that these regions were once part of the same landmass and were subsequently separated. The matching geological features provide further evidence for the separation of Mesosaurus populations due to continental drift.

Matching Climate and Habitat: Mesosaurus fossils indicate that the species was adapted to a freshwater environment. The presence of similar freshwater environments in both South America and Africa further supports the claim that Mesosaurus populations were separated when the continents drifted apart. The matching climate and habitat conditions provide evidence that supports the idea of geographic isolation and subsequent speciation.

In conclusion, the distribution of Mesosaurus fossils across South America and Africa, the geological similarities between these regions, and the matching climate and habitat conditions all support the claim that the separation of Mesosaurus populations can be explained by the process of continental drift.

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Answer:

Be,Mg,Ra etc

Explanation:

It should be palced in group 2A because as it reacts with chlorine in ratio of 1:2 . It's valancy is 2 and is metal as it react with non metal donating two electrons .

one more thing it fits there orderly

NICE its did not work at all

The pH of the given solution is 2.07,  the pH of the given solution is 1.38, the pH of the given solution is 1.90, and the pH of the given solution is 0.78.

Given, HBr is a strong acid, [HBr] = 8.5 × 10⁻³ M

(a) Calculation of pH: pH of the solution is given by: pH = -log[H⁺]Substituting the given values, pH = -log(8.5 × 10⁻³)pH = 2.07. Thus, the pH of the given solution is 2.07.

(b) Calculation of molarity: The molarity of the solution is given by:

Molarity = number of moles of solute/volume of solution in L

Number of moles of HNO3 = mass of HNO3 / molar mass of HNO₃

Molar mass of HNO3 = 1 + 14 + 3(16) = 63 g/mol

Number of moles of HNO3 = 1.52 g / 63 g/mol = 0.0241 moles

Volume of the solution = 575 mL = 0.575 L

Substituting the given values,

Molarity = 0.0241 moles / 0.575 L

Molarity = 0.042 M

Calculation of pH:

pH of the solution is given by:

pH = -log[H⁺]pH = -log(0.042)pH = 1.38

Thus, the pH of the given solution is 1.38.

(c) Calculation of molarity: The molarity of the solution is given by:

Molarity = number of moles of solute/volume of solution in L

Number of moles of HClO4 = molarity × volume in L

The number of moles of HClO4 = 0.250 M × (5.00 mL / 1000 mL)

A number of moles of HClO4 = 1.25 × 10⁻³ M

The volume of the solution after dilution = 50.0 mL = 0.0500 L

Substituting the given values,

M₁V₁ = M₂V₂0.250 M × (5.00 mL / 1000 mL) = M₂ × (50.0 mL / 1000 mL)M₂ = 1.25 × 10⁻² M

Calculation of pH: pH of the solution is given by:

pH = -log[H⁺]pH = -log(1.25 × 10⁻²)pH = 1.90

Thus, the pH of the given solution is 1.90.

(d) Calculation of moles:

Given, Volume of HBr = 10.0 mL = 0.01 L

The volume of HCl = 20.0 mL = 0.02 L

Moles of HBr = molarity × volume in L

Moles of HBr = 0.100 M × 0.01 L = 0.0010 M

Moles of HCl = molarity × volume in L

Moles of HCl = 0.200 M × 0.02 L = 0.0040 M

Total moles = 0.0010 M + 0.0040 M = 0.0050 M

The volume of the mixture = 10 mL + 20 mL = 30 mL = 0.03 L

Calculation of pH: pH of the solution is given by: pH = -log[H⁺]

The molarity of the solution is given by:

Molarity = total moles of solute/volume of solution in L

Molarity = 0.0050 M / 0.03 LMolarity = 0.1667 M[pH] = -log(0.1667)[pH] = 0.778

Thus, the pH of the given solution is 0.78.

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Answer:

the heat differs to the air as heat is energy and energy likes to travel