Calculate the isoionic and isoelectric pH of 0.02784 M isoleucine Enter your answers to the hundredths place. Amino Acid pKpk2 Asparagine 2.168.73 Glutamine 2.19 9.00 Isoleucine 2.318 9.758 Leucine 2.328 9.744 Number Isoionic pH10.72 Methionine 2.18 9.08 Phenylalanine 2.20 9.31 Proline Serine Tryptophan 2.37 9.33 Number Isoelectric pH6.038 1.952 10.640 2.187 9.209 Valine2.286 9.719

Answer:

False. Answer in pic above

In fact protons have no role in chemical reactions. The regrouping of atoms itself forms the new products in chemical reactions. The reactions involves the loss/gain or sharing of electrons.

A chemical reaction is a chemical change in which two or more atoms combine together to form a new product or a compound decomposes to form its constituent compounds. This  involves breaking or making of bonds.

In a chemical reaction, no change occurs in the nuclear composition but the valence electrons are involved in the reaction. Atoms loss or gain electrons or share valence electrons with other atoms to form ne compounds.

The electrostatic force of attraction or the overlapping of atomic orbitals make the new products in a chemical reaction. Hence, the statement is false.

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There are some important equations that we must know:

\(PV=nRT\)

\(n=\dfrac{m}{M}\)

We're given:

First, solve for n:

\(n=\dfrac{m}{M}\)

\(n=\dfrac{128}{32.00}\\\\n=4\)

Now, solve using the Ideal Gas Law:

\(PV=nRT\)

⇒ Isolate V:

\(V=\dfrac{nRT}{P}\)

⇒ Plug in given values:

\(V=\dfrac{4*8.31*273}{101.3}\\\\V =89.6\)

a. 89.6 L

Answer:

A person spends Rs. 10,000 per second.

In one year, he will spend = Rs. (10,000 x 3600 x 24×365) = Rs. 3.1536 x 10^11

1 mole rupees = Rs. 6.022 x 10^23

So it will take approximately 1.91 x 1012 years to spend 1 mole rupees.

Explanation:

ヾ(＾-＾)ノ

The final product beaker for the reaction between nitric acid and strontium hydroxide would contain strontium nitrate and water. [Precipitation] of strontium nitrate would occur, while water would remain in the solution. The beaker may also contain some excess nitric acid if it was not completely neutralized by strontium hydroxide.

When nitric acid (HNO3) reacts with strontium hydroxide (Sr(OH)2), a neutralization reaction occurs. The balanced chemical equation for this reaction is:

2HNO3 + Sr(OH)2 -> Sr(NO3)2 + 2H2O

In this reaction, the hydrogen ions (H+) from nitric acid react with the hydroxide ions (OH-) from strontium hydroxide to form water (H2O). The remaining components, strontium ions (Sr2+) and nitrate ions (NO3-), combine to form strontium nitrate (Sr(NO3)2), which is a soluble salt.

In the final product beaker, the strontium nitrate would be in the form of dissolved ions since it is soluble in water. Water would be present in the solution as the solvent. If there was any excess nitric acid that was not completely neutralized, it would also be present in the beaker.

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Explanation:

loss of electrons and an increase in oxidation number

The oxidation number of an atom is shown with a numerical value or a sign.

The oxidation number of an atom is a concept used in chemistry to indicate the degree of oxidation or reduction of an atom within a compound or ion. It represents the hypothetical charge that an atom would have if all its bonds were purely ionic.

The oxidation number can be represented by a numerical value or a sign. A positive numerical value indicates that the atom has lost electrons and undergone oxidation, while a negative numerical value indicates that the atom has gained electrons and undergone reduction. The sign is typically placed before the numerical value to indicate the direction of electron transfer.

Hence, the oxidation number of an atom is shown with a numerical value or a sign.

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Answer:

1) Organ

2) Organism

3) Organ System

4) Tissue

5) Cell or Tissue (im not sure)

6) Organism

7) Organ

8) Organism

9) Organism

Because of their differing nuclear charges, and as a result of shielding by inner electron shells, the different atoms of the periodic table have different affinities for nearby electrons.

The electron affinity is the potential energy change of the atom when an electron is added to a neutral gaseous atom to form a negative ion. So the more negative the electron affinity the more favourable the electron addition process is.

Not all elements form stable negative ions in which case the electron affinity is zero or even positive.

Electron affinity depends on the nuclear charge of an atom.

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Answer:

Explanation:

All compounds are molecules, but not all molecules are compounds. That is because a molecule can be made up of two atoms of the same kind, as when two oxygen atoms bind together to make an oxygen molecule. However, all compounds are made up of two or more different types of atoms.

Answer:

the last one

Explanation:

It is to be noted that there are no p orbitals accessible for multiple bonding in an sp3 hybrid. The two unhybridized p orbitals are accessible for multiple bonding in sp hybridization.

Bonds are formed using unhybridized p atomic orbitals. Two unhybridized p atomic orbitals from distinct atoms overlap side by side, resulting in a shared electron pair filling the area above and below the connecting line between the atoms (the internuclear axis).

An atom will contain the same amount of hybridized orbitals as electron density areas. There can be a total of four hybridized sp3 orbitals, thus take the number of regions of electron density and divide that by four to get the number of unhybridized p orbitals.

An atomic orbital is a function in atomic theory and quantum mechanics that describes the position and wave-like behavior of an electron in an atom. This formula may be used to determine the likelihood of locating any atom's electron in any given location surrounding the nucleus.

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The molar concentration of a 12% sodium chloride solution is approximately 2.05 M.

To determine the molar concentration of a 12% sodium chloride solution, we need to convert the given percentage concentration into molarity.

First, we need to understand that the percentage concentration refers to the mass of the solute (sodium chloride) relative to the total mass of the solution.

In this case, a 12% sodium chloride solution means that there are 12 grams of sodium chloride in 100 grams of the solution.

To convert this into molar concentration, we need to consider the molar mass of sodium chloride, which is 58.5 g/mol.

We can start by calculating the number of moles of sodium chloride in 12 grams:

Moles of sodium chloride = mass of sodium chloride / molar mass of sodium chloride

Moles of sodium chloride = 12 g / 58.5 g/mol = 0.205 moles

Next, we calculate the volume of the solution in liters using the density of the solution. Since the density is not provided, we assume a density of 1 g/mL for simplicity:

Volume of solution = mass of solution / density

Volume of solution = 100 g / 1 g/mL = 100 mL = 0.1 L

Finally, we calculate the molar concentration (Molarity) by dividing the number of moles by the volume in liters:

Molar concentration = moles of solute / volume of solution

Molar concentration = 0.205 moles / 0.1 L = 2.05 M

Therefore, the molar concentration of a 12% sodium chloride solution is approximately 2.05 M.


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Answer: the answer is D the last one.

Explanation:

hope this helps! have a good day! :) ^-^

The refrigerator would use 180 kilowatt-hours (kWh) of electric energy over the course of 30 days, assuming it runs for 12 hours each day.

To calculate the kilowatt-hours (kWh) of electric energy used by the refrigerator in 30 days, we need to multiply the power rating by the total running time.

Given:

Power rating of the refrigerator = 500 W

Running time per day = 12 hours

Number of days = 30

First, we need to convert the power rating from watts to kilowatts:

Power rating = 500 W / 1000 = 0.5 kW

Next, we calculate the total energy used in kilowatt-hours (kWh) over the 30-day period:

Energy used = Power rating × Running time × Number of days

Energy used = 0.5 kW × 12 hours/day × 30 days

Energy used = 180 kWh

Therefore, the refrigerator would use 180 kilowatt-hours (kWh) of electric energy over the course of 30 days, assuming it runs for 12 hours each day.

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Use the state equation for ideal gases: pV = nRT

Data:

V = 88.89 liter

n = 17 mol

T = 67 + 273.15 = 340.15 K

R = 0.0821 atm * liter / (K*mol)

=> p = nRT / V = 17 mol * 0.0821 (atm*liter / K*mol) * 340.15 K / 88.89 liter

p = 5.34 atm

Answer: p = 5.34 atm

Answer:

The answer would be C.

Explanation:

I took a test with the same question.

The activation energy is very high. Hence, option C is correct.

Activation energy is the sufficient amount of energy necessary to initiate a chemical reaction.

When sodium hydroxide (NaOH) dissolves in water, it is distributed into positively-charged sodium ions and negatively - charged hydroxide ions.

These cations and anions move around in the water, free and independent of each other, though cations tend to be surrounded more closely by anions and vice versa.

Hence, when sodium hydroxide and water will react at room temperature, the activation energy is very high.

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Answer:

Foods that are basic can be identified by its bitter taste. Option C

The final temperature of the gas is approximately 40.96 Kelvin.

To determine the final temperature of the gas, we can use the ideal gas law, which states:

PV = nRT

where P is the pressure, V is the volume, n is the number of moles of the gas, R is the ideal gas constant, and T is the temperature in Kelvin.

First, let's convert the given temperatures to Kelvin. We have:

Initial temperature: -125 degrees Celsius = 148 K (approximate)

Final temperature: Unknown

The initial conditions of the gas are as follows:

Initial pressure (P1) = 1.25 atm

Initial volume (V1) = 1250 mL = 1.25 L (since 1 L = 1000 mL)

Initial temperature (T1) = 148 K

The final conditions of the gas are as follows:

Final pressure (P2) = 50.0 atm

Final volume (V2) = 325 mL = 0.325 L

Final temperature (T2) = Unknown

Using the ideal gas law, we can set up the following equation:

(P1 * V1) / T1 = (P2 * V2) / T2

Substituting the known values:

(1.25 atm * 1.25 L) / 148 K = (50.0 atm * 0.325 L) / T2

Simplifying the equation:

T2 = (50.0 atm * 0.325 L * 148 K) / (1.25 atm * 1.25 L)

T2 = 40.96 K

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The correct options are: The boiling point is the temperature at which the vapor pressure equals the external pressure and Boiling occurs when the vapor pressure of the liquid is sufficient for bubbles of vapor to form in the interior of the liquid.

The first option is a fundamental concept in thermodynamics and describes the point at which a liquid changes into a gas. At the boiling point, the vapor pressure of the liquid becomes equal to the external pressure, causing the liquid to boil and turn into a gas. The boiling point is a unique property of a substance and can be used to identify and characterize it.

The second option is a description of the process by which boiling occurs. Boiling occurs when the vapor pressure of the liquid exceeds the external pressure and bubbles of vapor form in the interior of the liquid. These bubbles then rise to the surface and escape into the atmosphere. The temperature at which boiling occurs is the boiling point.

The other options are incorrect. A substance with strong intermolecular forces will have a high boiling point, not a low one. The boiling point of a substance increases as the external pressure decreases, not increases. Finally, while evaporation is a related process, it is not the same as boiling, which involves the entire volume of the liquid changing to a gas.

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When an atom becomes an anion it loses ions, so its becoming smaller

Answer:

This is called a hypothesis, which can be identified by the if... then... format.

So, the correct option is B. Form a hypothesis.

Let me know if this helps!

Answer:

C

Explanation:

the nucleus is an organelle containing the cell's chromosomes

2.70 grammes of N₂ must dissolve in 30.5 litres of water at 25 degrees Celsius and 4.46 atm of pressure.

The solubility of N₂ in water depends on the temperature and pressure. To determine the volume of water needed to dissolve 2.70 grams of N₂ at 25 °C and 4.46 atm, we need to use the Henry's law equation, which relates the solubility of a gas in a liquid to its partial pressure:

C = kH x P

where C is the concentration of the gas in the liquid, kH is the Henry's law constant for the gas, and P is the partial pressure of the gas above the liquid.

The Henry's law constant for N₂ in water at 25 °C is 7.07 x 10⁻⁴ M/atm.

First, we need to convert the mass of N₂ to moles using its molar mass:

moles of N₂ = 2.70 g / 28.02 g/mol = 0.0963 moles

Next, we can use Henry's law equation to find the concentration of N₂ in water:

C = kH x P = (7.07 x 10⁻⁴ M/atm) x (4.46 atm) = 3.16 x 10⁻³ M

Finally, we can use the definition of concentration (C = moles of solute / volume of solvent) to solve for the volume of water needed:

Volume of water = moles of solute / concentration = 0.0963 moles / 3.16 x 10⁻³ M = 30.5 L

Therefore, 30.5 liters of water are needed to dissolve 2.70 grams of N₂ at 25 °C under a pressure of 4.46 atm.

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Answer:

other guy is correct. it is C Quebec.

Explanation:

got it right on the unit test review, edge 2021

Answer:bromine

Explanation:

The mass of magnesium is 24 whereas 1 bromine atom is 80 (rounded up from 79.9) and there is 2 bromine atoms which means you have to multiply 80 by 2, giving you 160.

Answer:

B. Na

Explanation:

Once balanced you get 2Na + Cl₂ ⇒ 2NaCl. Sodium is the limiting reagent because it would produce the smallest amount of the product (NaCl)–while chlorine is the excess reagent. Based off of the Na in the balanced equation, it would produce 3 moles of NaCl, and for Cl₂ it would produce an excess of 6 moles of NaCl. [It'd be wise to utilize stoichiometric factors to get a good grasp of this]

Answer:

Explanation:

The work done by an object can be found by using the formula

From the question we have

workdone = 20 × 2

We have the final answer as

Hope this helps you

Answer: The answer is B. The pressure inside the tires increased.

Explanation:

The relationship between the pressure, volume, and temperature of a gas is described by the ideal gas law, which is usually written as:

\($$PV = nRT$$\)

where:

- \(\(P\)\) is the pressure,

- \(\(V\)\) is the volume,

- \(\(n\)\) is the number of moles of gas,

- \(\(R\)\) is the ideal gas constant, and

- \(\(T\)\) is the temperature (in Kelvin).

In this case, the volume \(\(V\)\) and the number of moles \(\(n\)\) of air in the tires stay the same. The temperature \(\(T\)\) is increasing. Therefore, for the equation to remain balanced, the pressure \(\(P\)\) must also increase.

So, the answer is B. The pressure inside the tires increased.