5. Briefly state the cause of the following diseases: hypertension, stroke, heart attack give a good answer to these suggested

Answer:

Volume of 10M HCl containing 4 moles HCl = 400 ml

Explanation:

Molarity x Volume (L) = moles

10M·V = 4 moles HCl

V = 4moles/10Molar = 4moles/10moles/Liter = 0.40L = 400ml

To calculate the mass of sodium benzoate needed to create a buffer with a pH of 4.25, we need to use the Henderson-Hasselbalch equation:

pH = pKa + log([A-]/[HA])

where pKa is the acid dissociation constant of benzoic acid (6.46), [A-] is the concentration of sodium benzoate, and [HA] is the concentration of benzoic acid.

First, we need to calculate the concentration of benzoic acid:

0.15 M = [HA]/0.151 L

[HA] = 0.02265 M

Next, we need to plug in the values for pH, pKa, and [HA] to solve for [A-]:

4.25 = 6.46 + log([A-]/0.02265)

-2.21 = log([A-]/0.02265)

[A-]/[HA] = 0.0075

Now we can calculate the concentration of sodium benzoate:

0.0075 = [A-]/0.151 L

[A-] = 0.00113 M

Finally, we can calculate the mass of sodium benzoate needed:

mass = moles x molar mass

mass = 0.00113 mol x 144.11 g/mol

mass = 0.163 g

Therefore, you would need to add 0.163 g of sodium benzoate to 151.0 mL of a 0.15 M benzoic acid solution to obtain a buffer with a pH of 4.25.
To calculate the mass of sodium benzoate needed to create a buffer with a pH of 4.25, we'll use the Henderson-Hasselbalch equation:

pH = pKa + log ([A-]/[HA])

Here, pH = 4.25, and [HA] is the concentration of benzoic acid (0.15 M). We need to find [A-], the concentration of the sodium benzoate. First, we need the pKa value of benzoic acid (HC7H5O2). The Ka value for benzoic acid is approximately 6.5 × 10^-5, so its pKa value is:

pKa = -log(Ka) = -log(6.5 × 10^-5) ≈ 4.19

Now we can find the concentration of sodium benzoate ([A-]):

4.25 = 4.19 + log ([A-]/[0.15])
0.06 = log ([A-]/[0.15])
10^0.06 = [A-]/[0.15]
[A-] = 0.15 × 10^0.06 ≈ 0.158 M

Now that we have the concentration of sodium benzoate, we can calculate the moles needed:

moles = (0.158 M) × (0.151 L) ≈ 0.0239 mol

Finally, we'll find the mass of sodium benzoate (molecular weight ≈ 144 g/mol):

mass = (0.0239 mol) × (144 g/mol) ≈ 3.44 g

So, you should add approximately 3.44 g of sodium benzoate to the 151.0 mL of 0.15 M benzoic acid solution to obtain a buffer with a pH of 4.25.

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The compound structure shows different functional groups present in the compound.Amine functional group (-NH2), amide functional group (-CONH2), and ester functional group (-COO-) are the functional groups present in Compound 2083. Therefore,

the correct option is B. Amine, amide, ester.

Compound 2083 is a potent ADAMTS-5 receptor antagonist. Among the given choices, the functional groups that are found on compound 2083 are Amine, amide, ester. Therefore,

the correct option is B. Amine, amide, ester.

Details are provided below.Functional groups are groups of atoms that exist within molecules and have particular chemical properties. The presence of different functional groups is a crucial aspect in determining the activity of a compound.Compound 2083 is a potent ADAMTS-5 receptor antagonist.

It is a compound with a molecular weight of 523.64 g/mol.

Compound structure  is shown in the word doc. The compound structure shows different functional groups present in the compound.Amine functional group (-NH2), amide functional group (-CONH2), and ester functional group (-COO-) are the functional groups present in Compound 2083. Therefore,

the correct option is B. Amine, amide, ester.

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The doctor will use the unit "degrees Celsius (°C)" to measure temperature.

Temperature is a measure of the average kinetic energy of particles in a substance. The Celsius scale is commonly used in medical settings for measuring body temperature. On the Celsius scale, the freezing point of water is defined as 0°C, and the boiling point of water is defined as 100°C at standard atmospheric pressure.

Using a clinical thermometer, the doctor will place it in contact with the person's body, typically under the tongue, in the ear, or in the armpit, to obtain an accurate measurement of their body temperature. The reading will be displayed in degrees Celsius (°C), which is the most widely used temperature unit in the medical field.

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Answer:

The answer is

Explanation:

The percentage error of a certain measurement can be found by using the formula

\(P(\%) = \frac{error}{actual \: \: number} \times 100\% \\ \)

From the question

actual volume = 35 mg

error = 35 - 28 = 7

The percentage error is

\(P(\%) = \frac{7}{35} \times 100 \\ = \frac{1}{5} \times 100 \\ = 20\)

We have the final answer as

Hope this helps you

Answer:

20%

Explanation:

The formula is [ |va-ve/ve| * 100% ] where e = error and n = number.

|28-35/35| * 100

|-7/35| * 100%

|-1/5| * 100%

0.2 * 100%

20%

Best of Luck!

Answer:

1160mg

Explanation:

Molarity = number of moles ÷ volume

According to the information in the question, molarity = 1.25 M, volume = 18.0 mL = 18/1000 = 0.018L

M = n/V

n = M × V

n = 1.25 × 0.018

n = 0.0225moles.

Using mole = mass/molar mass, to find the mass of lithium phosphide (Li3P)

Molar mass of Li3P = 6.9(3) + 31 = 51.7g/mol

mole = mass/molar mass

0.0225 = mass/51.7

mass = 1.16grams.

In milligrams (mg), mass of Li3P = 1.16 × 1000 = 1160mg

Answer:

if its multiple, C and D, if not, C

Explanation:

brainliesttt?

One organism was ancestor of the other organism and both organisms lived around the same time is the conclusion made by scientist.

Fossil scientist are the specialists in studying the ancient fossils of animals and plants.

If fossils of two different species of very similar organisms are found in different layers of rock then it might be the possibility that one organism was ancestor of the other or both organisms lived around the same time. Because it is not necessary that if two species had the same organism then they have same behavior.

Hence, option (c) & (d) is correct.

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Answer: Why exacly am i a rat

Explanation:

,....

but thanks

Answer:

what!!!??????

Answer:A

Explanation: A hydrogen bond is two hydrogen atoms being bonded together

Answer:

The hypthesis of the stated thesis, states that the changes in solar irradiance effect surface tempeture of the glove. Why does the suns tempture effects the globes tempture?

Explanation:

The hypthesis of the stated thesis, states that the changes in solar irradiance effect surface tempeture of the glove. Why does the suns tempture effects the globes tempture?

The standard reduction potential for the half-reaction M3+(aq) + 3e- → M(s) can be determined by subtracting the standard reduction potential of the half-reaction Ag+(aq) + e- → Ag(s) from the overall reaction's standard potential.

Given:

E°(overall reaction) = +2.46 V (from the balanced equation)

E°(Ag+(aq) + e- → Ag(s)) = +0.80 V (given)

To find E°(M3+(aq) + 3e- → M(s)):

E°(M3+(aq) + 3e- → M(s)) = E°(overall reaction) - E°(Ag+(aq) + e- → Ag(s))

E°(M3+(aq) + 3e- → M(s)) = +2.46 V - (+0.80 V)

E°(M3+(aq) + 3e- → M(s)) = +1.66 V

Therefore, the standard reduction potential for the half-reaction M3+(aq) + 3e- → M(s) is +1.66 V.

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Answer:

Explanation:

hope it helps

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The molarity of HCl is found in a titration where 30 mL of HCl is titrated with 15 mL of 0.1 M NaOH is 0.05 M.

Molarity is the measure of the concentration of any solute per unit volume of the solution.

The reaction is \(\rm NaOH(aq)+HCl(aq) \rightarrow H2O(l)+NaCl(aq)\)

The ratio is 1:1

Step1- to calculate the equal moles of HCl

\(\dfrac{0.1\;mol\;NaOH}{ L} \times 15\;ml = 1.5\; mmol\)

Step2: Calculate the molar concentration

\(\dfrac{1.5 \; m mols\;HCl}{ 30\;ml\;HCl} = 0.05 \;M \;HCl\)

Thus, the molarity of HCl is 0.05 M.

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answer

Please add answer choice

Explanation:

Answer:

Explanation:

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

Gasohol is a blend of gasoline and ethanol. To determine the maximum work that can be obtained by burning 1.003 mol of C2H5OH at 25°C and 1 atm, the Gibbs free energy equation can be utilized. What is Gibbs free energy equation? Gibbs free energy equation is a thermodynamic equation that quantifies the maximum quantity of work that may be obtained during a chemical reaction. T

he equation is as follows: ΔG = ΔH - TΔSThe values of ΔH and ΔS are calculated from thermodynamic tables or by calculating the enthalpy and entropy of the products and reactants, and the temperature, T, is usually specified in Kelvin. The change in Gibbs free energy, ΔG, is the maximum amount of energy that can be obtained from the reaction in the form of useful work if the reaction takes place at constant pressure and temperature. The reaction will proceed spontaneously if ΔG is negative. And if ΔG is positive, the reaction will not take place spontaneously. The solution to this problem is shown below:

First, let's figure out how much heat is produced when one mole of C2H5OH is burnt.ΔHrxn = [2(moles of CO2)(-393.5 kJ/mol) + 3(moles of H2O)(-285.8 kJ/mol)] - [(moles of C2H5OH)(-277.7 kJ/mol)]ΔHrxn = [2(2.006 mol)(-393.5 kJ/mol) + 3(3.009 mol)(-285.8 kJ/mol)] - [1.003 mol(-277.7 kJ/mol)]ΔHrxn = -2043.5 kJ/mol. Now, we'll figure out the entropy change for the reaction.ΔSrxn = [2(moles of CO2)(213.8 J/mol-K) + 3(moles of H2O)(69.9 J/mol-K)] - [(moles of C2H5OH)(160.7 J/mol-K)]ΔSrxn = [2(2.006 mol)(213.8 J/mol-K) + 3(3.009 mol)(69.9 J/mol-K)] - [1.003 mol(160.7 J/mol-K)]ΔSrxn = -104.3 J/mol-KThe temperature in Kelvin is 25°C.273 + 25 = 298 KΔG = ΔH - TΔSΔG = -2043.5 kJ/mol - (298 K)(-104.3 J/mol-K)/1000ΔG = -2032.6 kJ/mol. Therefore, the maximum work that can be obtained by burning 1.003 mol of C2H5OH is 2032.6 kJ/mol, which is the value of ΔG.

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An air mass is a volume of air whose temperature and humidity are specified. Many hundreds or thousands of square miles are covered by air masses, which adjust to the properties of the land underneath them.

An air mass is a volume of air whose temperature and humidity are specified. Many hundreds or thousands of square miles are covered by air masses, which adjust to the properties of the land underneath them. Latitude and their continental or marine source regions are used to categorize them.

There is a temperature and air pressure differential. Storms are caused by abrupt changes in the weather. Two natural wind patterns come into conflict.

The hot and dry continental tropical (cT) air mass is prevalent over subtropical and tropical continents. The world's largest deserts, such the Sahara, Arabian, and Australian, are important source areas.

Thus, Latitude and their continental or marine source regions are used to categorize them. An air mass is a volume of air whose temperature and humidity are specified.

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Answer:

a. friction

Explanation:

What is a common unbalanced force acting in motion? Common forces that are often unbalanced include the force of gravity and applied forces. When these forces are unbalanced, objects accelerate, change their position and find new configurations for which all forces are again balanced.

Friction is a kind of force.

The elements that make up the solid bonding patterns between atoms is the characteristic of a solid is most responsible for their structure.

When the forces binding atoms or molecules together are greater than the energy separating them, solids are created. Atomic bonding patterns are one of the most crucial elements that determine the final physical makeup of a given solid item. The more solid an object is, the stronger the bond pattern. Solids have hard, rigidly defined shapes and volumes. Around fixed axes, particles oscillate. Strong intermolecular interactions, or strong interactions between molecules, result in the tight aggregation and fixed locations of solids' molecules. Solid particles are strongly attracted to one another.

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The following nuclear equation isn't balanced because the atomic number or subscript of element is not correct as it is meant to be 97.

This is referred to as an equation for a chemical reaction in which the number of atoms for each element in the reaction and the total charge are the same for both the reactants and the products.

This is referred to an alpha nuclear reaction due to the presence of helium atom as the product.in this scenario, addition of the superscript and subscript on the reactant and product side will give the accurate value. This therefore means that 95+2 = 97 will make the equation balanced.

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Answer:

Chemical reaction

Explanation:

Answer:

pH = 6.20

Explanation:

The pKa of cacodylic acid is 6.

To solve this question we must use Henderson-Hasselbalch equation:

pH = pKa +log [A⁻] / [HA]

Where pKa is the pKa of the weak acid = 6

And [] could be taken as the moles of A⁻ the conjugate base, and HA, the weak acid.

The moles of the NaOH added to the solution of the weak acid are = Moles A⁻

And moles HA = Initial moles HA - Moles NaOH added

Initial moles HA:

0.0200L * (0.130mol / L) = 0.00260 moles

Moles NaOH:

0.0200L * (0.0800mol / L) = 0.00160 moles = [A⁻]

Moles HA =

0.00260 moles - 0.00160 moles = 0.00100 moles = [HA]

pH = 6 +log [0.00160 moles] / [0.00100 moles]

The pH of the resulting solution is 1.6.

Let cacodylic acid be HA, mixing cacodylic acid and NaOH, the following occurs;

HA(aq) + NaOH(aq) ------> NaA(aq) + H2O(l)

Number of moles of NaOH = 0.0800 molL−1 × 20.0/1000 = 0.0016 moles

Number of moles of HA = 20.0/1000  × 0.130 = 0.0026 moles

We can see that the HA is in excess, Number of moles of excess acid =

0.0026 - 0.0016 = 0.001 moles

Total volume of solution = 20.0 mL + 20.0 mL = 40 mL or 0.004 L

Molarity of excess acid =  0.001 moles/0.004 L = 0.025 M

pH = -log[H^+]

pH = -log[0.025 M]

pH = 1.6

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The thermal energy of one system must be the same as the thermal energy of the other system. Therefore, the correct option is option D.

A pan heats up when you place it on the flame. It's because heat is transferred from the burner to the pan. Additionally, it allows any other utensil or pan to heat up. But after a while, the vessel cools down when you remove it from the heat. It happens because the vessel's heat is dissipated onto the surrounding area. It enables the vessel to cool.

Heat that flows by conduction is the transfer of thermal energy between substances in contact. The thermal energy of one system must be the same as the thermal energy of the other system.

Therefore, the correct option is option D.

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Answer:

\(\% \: error = | \frac{origina - expirimental}{original} | \times 100 \\ | \frac{78.40 - 75.70}{78.40} | \times 100 \\ = \frac{2.7}{78.4} \times 100 \\ =3.44 \\ thank \: you\)

Answer:

Explanation:

When Iron is dipped in Aluminium Chloride, a redox reaction occurs. Basically iron reacts with Chloride ion and forms a solid precipitate of Aluminium.

End result :Iron (II) Chloride forms and Aluminium forms the precipitate

Answer:

13.9

Explanation:

Answer:

A.) an exothermic reaction that has an increase in disorder.

Explanation:

got it correct (unit review test)

The answer is- NADH and FADH

An oxidizing agent is a chemical that has one of the three properties listed.

1. Can receive electrons.

2. Can remove hydrogen.

3. Oxygen can be added to the reactants.

How NAD+ acts as a oxidising agent?

Image attached.

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The amount of precipitate formed in both cases will be the same. If 50.0 mL of 2.0 M NaCl(aq) and 50.0 mL of 1.0 M AgNO3(aq) are combined, the reaction will consume the same number of moles of each reactant as if 50.0 mL of 1.0 M NaCl(aq) and 50.0 mL of 1.0 M AgNO3(aq) were combined.

If 50.0 mL of 2.0 M NaCl(aq) and 50.0 mL of 1.0 M AgNO3(aq) were combined, the amount of precipitate formed would be the same as if 50.0 mL of 1.0 M NaCl(aq) and 50.0 mL of 1.0 M AgNO3(aq) were combined.

This is because the balanced chemical equation for the reaction between NaCl(aq) and AgNO3(aq) shows that the reactants are present in a 1:1 ratio. This means that for every 1 mole of NaCl(aq) that reacts, 1 mole of AgNO3(aq) is also consumed. The concentration of a solution is a measure of the amount of solute present in a given amount of solvent, and is typically expressed in moles per liter (M).

Since the concentration of a solution is proportional to the number of moles of solute present, a 2 M solution of NaCl(aq) contains twice as many moles of NaCl(aq) as a 1 M solution of NaCl(aq). Similarly, a 1 M solution of AgNO3(aq) contains the same number of moles of AgNO3(aq) as a 1 M solution of NaCl(aq).

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