histidine is an important amino acid with an aromatic side chain that contains two nitrogens. which nitrogen do you think would get protonated in acid

The percent by mass of water in the hydrated compound is 60.3%.

Percentage by mass is a way to express the concentration of a solution or the composition of a mixture as a percentage of the total mass of the solution or mixture. It is calculated by dividing the mass of the solute or component of interest by the total mass of the solution or mixture and multiplying by 100%.

The formula for percentage by mass is:

Percentage by mass = (Mass of solute or component / Total mass of solution or mixture) x 100%

The mass of water in the hydrated compound can be calculated by subtracting the final mass of the anhydrate from the initial mass of the hydrated:

Mass of water = Initial mass of hydrated - Final mass of anhydrate Mass of water = 9.5 g - 3.77 g Mass of water = 5.73 g

The percent by mass of water in the hydrated compound can be calculated using the following formula:

Percent by mass = (Mass of water / Initial mass of hydrated) x 100%

Substituting the values we get:

Percent by mass = (5.73 g / 9.5 g) x 100% Percent by mass = 60.3%

Therefore, the percent by mass of water in the hydrated compound is 60.3%.

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Answer:

Explanation:

To convert the concentration of the solution from g/100 cm to g/dm^3, we need to first convert the volume unit from cm^3 to dm^3.

1 dm^3 = 10^3 cm^3

So, if 100 cm^3 of the solution contains 10 g of hydrogen peroxide, then 10^3 cm^3 (1 dm^3) of the solution contains 10 g * (10^3 / 100) = 10^3 g = 1000 g.

Therefore, the concentration of the solution in g/dm^3 is 1000 g/dm^3.

According to the question the element undergoing oxidation is nitrogen (N).

Oxidation is a chemical reaction that involves the loss of electrons from an atom, molecule, or ion. This process creates an oxidized version of the original molecule or ion, which can often be identified by a change in color or smell. Oxidation reactions can occur in both organic and inorganic molecules. Examples of oxidation include the rusting of iron and the browning of an apple when exposed to air. Oxidation often results in the release of energy, which can be harnessed for various applications.

This is because it is gaining oxygen (O) atoms in the reaction. The element undergoing reduction is oxygen (O). This is because it is losing electrons (in the form of oxygen atoms) in the reaction.

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The largest change in entropy will be in c) C(graphite)  -----> C(diamond).So,correct option is c.

Entropy is a logical idea, as well as a quantifiable actual property, that is generally usually connected with a condition of turmoil, haphazardness, or vulnerability. The term and the idea are utilized in assorted fields, from traditional thermodynamics, where it was first perceived, to the minuscule depiction of nature in measurable material science, and to the standards of data hypothesis. It has found far-going applications in science and physical science, in natural frameworks and their connection to life, in cosmology, financial aspects, social science, climate science, environmental change, and data frameworks remembering the transmission of data for telecommunication.

The thermodynamic idea was alluded to by Scottish researcher and designer William Rankine in 1850 with the names thermodynamic capability and intensity potential. In 1865, German physicist Rudolf Clausius, one of the main pioneers behind the field of thermodynamics, characterized it as the remainder of a little measure of intensity to the prompt temperature.

Hence,correct option is c.

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(Complete question) is:

Which change occurs with the largest increase in entropy at 25°C?

a)Br₂(l)----->Br₂(g)

b)Br₂(g)-------->Br(l)

c)C(graphite)-------->C(diamond)

d)H₂O(s)-------->H₂O(l)

This error would cause the gas constant to be underestimated because the gas constant is a function of temperature and pressure.

If the temperature is underestimated, then the pressure calculated would be too high, resulting in an underestimation of the gas constant. The gas constant would remain unaffected because it does not depend on the temperature of the hydrogen gas. The gas constant is a physical constant which is the same for all gases regardless of their temperature or pressure. The gas constant is defined as the ratio of the universal gas constant (R) to the molar mass (M) of a particular gas. It is a measure of the ideal gas law and is equal to 8.3144598 joules per Kelvin per mole (J/K/mol). Therefore, an error in the temperature of the hydrogen gas would not affect the gas constant.

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Answer:

ultraviolet, or UV rays from the sun can damage yor skin. thats why you put on sunscreen lol

The molar mass of the monoprotic acid, given that 1.07 g of the acid was dissolved in water is 192.27 g/mol

We'll begin by obtaining the mole of KOH in the solution. Details below:

Mole = Molarity x Volume

Mole of KOH = 0.210 × 0.0265

Mole of KOH = 0.005565 mole

Next, we shall determine the mole of the monoprotic acid. Details below:

Balanced equation:

HA + KOH —> KA + H₂O

From the balanced equation above,

1 mole of KOH reacted with 1 mole of HA.

Therefore,

0.005565 mole of KOH will also react with 0.005565 mole of HA.

Finally, we shall determine the molar mass of the monoprotic acid. Details below:

Molar mass = mass / mole

Molar mass of monoprotic acid = 1.07 / 0.005565

Molar mass of monoprotic acid = 192.27 g/mol

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It is more accurate to standardize the NaOH with KHP than to standardize with a solution of HCl because it is stable under the acid base reaction conditions and has a high molecular weight.

Titration processes may occasionally claim a standardization process to regularize a secondary standard using a primary standard. This is because a secondary standard is what will be used in the titration of a certain analyte and its original attention may not be known directly beforehand.

Strong base solutions need to be standardised since chemicals like NaOH will inadvertently pick up moisture from the air and react with gases like CO2 to produce undesired contaminants in the base's stock sample. As a result, we cannot be certain that the mass of NaOH pellets we measure to create a desired solution is the mass of NaOH itself. The bulk consists of all of the impurities together. As a result, we cannot be certain of the base concentration in the solution we make.

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Answer:

no answer

Explanation:

you can get the answer If you go back to your textbook

The mass percent (m/m) of the solution prepared by dissolving 56.27 g of NaCl in 179.3 g of H2O is 23.85%.To calculate the mass percent (m/m) of a solution prepared by dissolving 56.27 g of NaCl in 179.3 g of H2O, we first need to calculate the total mass of the solution:

Total mass of solution = mass of solute + mass of solvent

Total mass of solution = 56.27 g NaCl + 179.3 g H2O

Total mass of solution = 235.57 g

Next, we can calculate the mass percent (m/m) of NaCl in the solution using the formula:

Mass percent (m/m) = (mass of solute / total mass of solution) x 100%

Mass percent (m/m) of NaCl = (56.27 g / 235.57 g) x 100%

Mass percent (m/m) of NaCl = 23.85%

Therefore, the mass percent (m/m) of the solution prepared by dissolving 56.27 g of NaCl in 179.3 g of H2O is 23.85%.

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A concentration in terms of volume/volume is used to describe a solution with a liquid solvent and a liquid solute.

A homogeneous mixture composed of two or more substances is called a solution.

In a solution, there are two primary components, which are termed as,

The minor component that is dissolved in a solution is known as the solute. The major component that dissolves the solute is known as the solvent.

For a solid substance, it is preferred to use the mass of the solid than the volume of the substance.

Whereas, in the case of liquids it is preferred to use the volume of the liquid than the mass of the liquid.

Hence, if both the solute and solvent of the solution are liquid then only a concentration in terms of volume/volume is used to describe the solution.

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The brine a more effective de-ice solution than solid ice melt products the correct option is b. Since brine is a already a solution, the Van't Hoff Factor is higher than the solid salt, making the freezing point depression greater.

The Salt brine for the roads is the solution of the salt that is generally the sodium chloride and the water, and it will help to keep the roads safe and use as less salt. The brine is a already a solution, the Van't Hoff Factor is higher than the solid salt, forms the freezing point depression greater.

The Freezing point depression will requires the solution to occur. The Brine to starts the solution, where the solid salt will form the solution first.

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When aqueous solutions of barium nitrate and potassium carbonate are mixed, a precipitate of barium carbonate (BaCO3) will form.

A precipitate is a solid that forms and separates out of a solution when two or more soluble compounds are mixed together.

The balanced chemical equation for the reaction is:

Ba(NO3)2 (aq) + K2CO3 (aq) → BaCO3 (s) + 2 KNO3 (aq)

In this reaction, the barium cation (Ba2+) from barium nitrate (Ba(NO3)2) combines with the carbonate anion (CO32-) from potassium carbonate (K2CO3) to form the insoluble salt barium carbonate (BaCO3), which precipitates out of solution.

Note that the potassium cation (K+) and the nitrate anion (NO3-) remain in solution as soluble salts, potassium nitrate (KNO3).

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To find the valence core and unpaired electrons of an atom or molecule, one must first identify the outer electrons of the atom or molecule.

This can be done by looking at the electron configuration of the atom or molecule. The valence core is the set of electrons in the outermost energy level, which is also referred to as the valence shell.

The number of unpaired electrons is equal to the number of electrons in the valence shell that is not part of a covalent bond.

To determine the number of unpaired electrons in a molecule, it is necessary to subtract the total number of electrons in covalent bonds from the total number of electrons in the valence shell.

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The mass of the sample of gold that transferred its energy to the water is 22.7 g

What is Specific Heat Capacity ?

Specific heat capacity is the amount of heat required to raise the temperature of one unit of mass of a substance by one degree Celsius or Kelvin, without a change in phase. It is a physical property of the substance and is typically measured in units of J/(g·°C) or J/(g·K).

We can use the equation for heat transfer to solve this problem:

q = m * c * ΔT

where q is the heat transferred, m is the mass of the sample, c is the specific heat capacity, and ΔT is the change in temperature.

First, we need to calculate the heat transferred from the gold to the water:

q = m_gold * c_gold * ΔT_gold

where m_gold is the mass of the gold, c_gold is the specific heat capacity of gold, and ΔT_gold is the change in temperature of the gold.

ΔT_gold = 150.0oC - 20.0oC = 130.0oC

q = m_water * c_water * ΔT_water

where m_water is the mass of the water, c_water is the specific heat capacity of water, and ΔT_water is the change in temperature of the water.

ΔT_water = 45.0oC - 20.0oC

= 25.0oC

Now, we can set the two expressions for q equal to each other and solve for m_gold:

m_gold * c_gold * ΔT_gold = m_water * c_water * ΔT_water

m_gold = (m_water * c_water * ΔT_water) / (c_gold * ΔT_gold)

Substituting the given values:

m_gold = (50.00g * 4.184 J/g oC * 25.0oC) / (0.130 J/g oC * 130.0oC)

= 22.7 g

Therefore, the mass of the sample of gold that transferred its energy to the water is 22.7 g

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ANS = 0.288 L can be made.

The first thing that you need to do here is to convert the mass of lithium bromide to moles by using the compound's molar mass.

The number of moles of the solute—in your example, lithium bromide—present per 1.00 L of the solution is simply referred to as the molarity of the solution.

For every 1.00 L of this solution, 4.00 moles of lithium bromide must be present in order to create a 4.00-M solution.

You may calculate how many litres of this solution can be made using the molarity of the solution as a conversion factor because you already know that your sample contains 1.1515 moles of lithium bromide.

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you need to measure out 17.0 grams of NaOH to prepare a 1.7 M solution of 250.0 mL.

To calculate the amount of NaOH needed to prepare a 1.7 M solution of 250.0 mL, we can use the formula:

moles of solute = concentration (in M) x volume (in L)

First, we need to convert the volume from milliliters to liters:

250.0 mL = 250.0 / 1000 = 0.25 L

Now, we can plug in the values:

moles of NaOH = 1.7 M x 0.25 L

moles of NaOH = 0.425 mol

Finally, we can calculate the mass of NaOH required using its molar mass:

mass of NaOH = moles of NaOH x molar mass of NaOH

The molar mass of NaOH is 40.00 g/mol (sodium: 22.99 g/mol, oxygen: 15.99 g/mol, hydrogen: 1.01 g/mol).

mass of NaOH = 0.425 mol x 40.00 g/mol

mass of NaOH = 17.0 g

Therefore, To calculate the amount of NaOH needed to prepare a 1.7 M solution of 250.0 mL, we can use the formula:

moles of solute = concentration (in M) x volume (in L)

First, we need to convert the volume from milliliters to liters:

250.0 mL = 250.0 / 1000 = 0.25 L

Now, we can plug in the values:

moles of NaOH = 1.7 M x 0.25 L

moles of NaOH = 0.425 mol

Finally, we can calculate the mass of NaOH required using its molar mass:

mass of NaOH = moles of NaOH x molar mass of NaOH

The molar mass of NaOH is 40.00 g/mol (sodium: 22.99 g/mol, oxygen: 15.99 g/mol, hydrogen: 1.01 g/mol).

mass of NaOH = 0.425 mol x 40.00 g/mol

mass of NaOH = 17.0 g

Therefore, you need to measure out 17.0 grams of NaOH to prepare a 1.7 M solution of 250.0 mL.

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Oxygen and silicon are the two most abundant elements in the Earth's crust, making up approximately 75% of the crust by weight.

The Earth's crust is composed of various elements, but two of the most abundant ones are oxygen and silicon. Oxygen is the most abundant element on Earth, and it makes up about 47% of the Earth's crust by weight. It is found in minerals like quartz, feldspar, and mica, and is an essential component of the Earth's atmosphere and biosphere.

Silicon is the second most abundant element in the Earth's crust and accounts for about 28% of its weight. It is found in minerals such as quartz, feldspar, and mica, and is also a key component in many human-made products, including computer chips and solar panels.

Together, oxygen and silicon make up approximately 75% of the Earth's crust by weight. Other significant elements include aluminum, iron, calcium, sodium, and potassium, while trace elements such as copper, zinc, and gold are present in small amounts. Understanding the composition of the Earth's crust is important for fields such as geology, mineralogy, and environmental science.

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Mg(s) + 2HCl(ag) + MgCl2(ag) + H2
If 1.53 g magnesium reacted,0.064 g of hydrogen gas is produced.

From the balanced chemical equation, 1 mole of magnesium reacts with 2 moles of hydrochloric acid to produce 1 mole of hydrogen gas.
The molar mass of magnesium is 24.31 g/mol. Therefore, the number of moles of magnesium in 1.53 g of magnesium is:

1.53 g / 24.31 g/mol = 0.063 moles

According to the balanced chemical equation, 1 mole of magnesium produces 1 mole of hydrogen gas. Therefore, 0.063 moles of magnesium produce 0.063 moles of hydrogen gas.

The molar mass of hydrogen is 1.008 g/mol. Therefore, the mass of 0.063 moles of hydrogen gas is:
0.063 moles x 1.008 g/mol = 0.064 g
So, 0.064 g of hydrogen gas is produced.

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Answer: ISOTOPES

Explanation:

isotopes are different types of the same element, this could be because they have an extra neutron, for example.

however, this does not apply to atoms that lose or gain electrons.

for example, Hydrogen has an isotope called Deuterium (or Hydrogen-2)  and Tritium (Hydrogen-3).

The observation that shows a change in state of matter has occurred is option A) Wood burns, producing gas and an ashy residue.

A change in state of matter refers to the transformation of a substance from one physical state to another, such as from solid to liquid, liquid to gas, or vice versa. In option A, when wood burns, it undergoes a chemical reaction known as combustion.

During combustion, the wood reacts with oxygen in the air and undergoes a transformation from a solid state to a gaseous state, producing gas (such as carbon dioxide and water vapor) as well as an ashy residue (solid carbon and other impurities remaining after the combustion process). This change in state is accompanied by the release of heat and light.

Option B, where dew forms on the grass overnight, does not indicate a change in state of matter. Dew formation is a physical process known as condensation, where water vapor in the air cools down and changes into liquid water droplets upon contact with a colder surface (such as grass). In this case, the state of matter remains the same (from a gaseous state to a liquid state), and no new substances are formed.

Option C, where an alkali indicator changes color when added to a cleaner, also does not represent a change in state of matter. It suggests a chemical reaction between the alkali indicator and the cleaner, resulting in a color change. However, the states of matter involved (liquid or solid) do not change during this process.

In summary, option A is the observation that indicates a change in state of matter, as it involves the transformation of wood from a solid state to a gaseous state during combustion.

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It is False that acid rain can damage your skin so the correct option among group of choices is (B) False.

Acid rain typically refers to rain with a pH below 5.6, which is more acidic than normal rain. While acid rain can damage certain materials, such as metals and buildings, it is unlikely to directly damage human skin. This is because the skin has a protective outer layer that helps to regulate the pH and prevent the penetration of harmful substances.

However, swimming in an acidic lake could potentially damage the skin, as the acid can disrupt the pH balance of the skin and cause irritation or burns. Additionally, exposure to acid rain can indirectly harm human health by damaging crops and forests, which can impact the food supply and air quality.

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Answer:

A redox reaction, also known as oxidation-reduction reaction, is a type of chemical reaction in which the oxidation state of a molecule changes due to the transfer of electrons from one molecule to another molecule.

Answer:

A chemical reaction that takes place between an oxidizing substance and a reducing substance.

Explanation:

In an ecosystem, the coastal area  that is rotating toward the moon is the area where  tide rising to form a high tide.

Ecosystem is defined as a system which consists of all living organisms and the physical components with which the living beings interact. The abiotic and biotic components are linked to each other through nutrient cycles and flow of energy.

Energy enters the system through the process of photosynthesis .Animals play an important role in transfer of energy as they feed on each other.As a result of this transfer of matter and energy takes place through the system .

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If we wanted to produce 4.30 grams of iron (III) hydroxide, the ml of 1.00 M Fe(NO₃)₃  excess sodium hydroxide is 0.040 L.

The mass of the iron (III) hydroxide = 4.30 grams

The mass molar  of iron (III) hydroxide = 106.87 g/mol

The moles of the iron (III) hydroxide = mass /molar mass

The moles of the iron (III) hydroxide = 4.30 / 106.87

The moles of the iron (III) hydroxide = 0.040 mol

The molarity = 1 M

The volume = moles / molarity

Volume = 0.040 / 1

Volume = 0.040 L

Thus, the volume of Fe(NO₃)₃  is 0.040 L.

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The mass of a substance per mole of that substance is defined as its molar mass. The molar mass of a substance is the mass in grams of one mole of that substance and is usually expressed in grams per mole (g/mol).

The molar mass of a substance is used to convert between the number of moles of a substance and its mass, which can be useful in various chemical calculations and reactions. For example, if you know the molar mass of a substance, you can calculate the number of moles present in a given mass of that substance by dividing the mass by the molar mass.

In addition to its use in chemical calculations, the molar mass of a substance is also used in determining the density of a substance, as well as in various other physical and chemical properties. The molar mass can also be used to compare different substances, as substances with a larger molar mass typically have different physical and chemical properties than substances with a smaller molar mass.

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When we have 10% (m/v) ibuprofen on hand, we have to add 48ml of 10% (m/v) solution.

Lets say, we need 'x' ml of ibuprofen

the molecular weight of ibuprofen = 206.29 g/mol

now we know 4%(m/v) ibuprofen means 100ml of the total solution contains 4g of ibuprofen = 4g/206.29g/mol

= [tex]\frac{4}{206.29}[/tex]mol of ibuprofen

100 ml contains = [tex]\frac{4}{206.29}[/tex]mol

therefore 120 ml contains = = [tex]\frac{4}{206.29}[/tex] x 120 mol........(1)

10% (m/v) means 100ml contains mol

therefore we know 'x' ml is

10/206.29 × x mol........(ii)

we can say that (i) = (ii)

so we get,

120×4 = 10x

10x = 480

x = 48

so now we have to add 48ml of 10% (m/v) solution.

S₁×v₁ = S₂v₂

∴4 × 120 = 8 × v₂

v₂ = 48

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As electron orbital transition a produces light with a wavelength of 690 nm, the wavelength of the light produced by transition b is 1380 nm.

The energy of a photon is inversely proportional to its wavelength, so we can use the fact that transition b involves half the energy of transition a to determine the wavelength of the light it produces.

The energy of transition b is half that of transition a, so the wavelength of the light produced by transition b will be twice that of transition a. Therefore, the wavelength of the light produced by transition b is:

Wavelength b = 2 x Wavelength a

Wavelength b = 2 x 690 nm

Wavelength b = 1380 nm

So, the wavelength of the light produced by transition b is 1380 nm.

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In water, 1 mol of Al(ClO₃)₃ (aq) will dissociate into two moles of Al³⁺ ions and three moles of ClO³⁻ions.

In water, 1 mol of Al(ClO₃)₃ (aq) will dissociate into the following ions: Al³⁺and ClO³⁻.

When Al(ClO₃)₃ is dissolved in water, it will dissociate into its constituent ions. The Al³⁺ ion will separate from the three ClO³⁻ ions. This process is known as dissociation and is a common occurrence when ionic compounds are dissolved in water.

The resulting solution will contain Al³⁺ and ClO³⁻ions that are free to move around and interact with other ions in the solution. In summary, 1 mol of Al(ClO₃)₃ (aq) will dissociate into 1 mol of Al³⁺ ions and 3 mol of ClO³⁻ ions in water.

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A mole of Chromebooks lined up end to end would encircle the moon approximately 1.59 x 10^16 times.

The length of a standard-size school Chromebook is 11.6 inches.

To determine the number of times a mole of Chromebooks lined up end to end would encircle the moon, we need to first convert the length of one Chromebook into meters and then multiply that by Avogadro's number, which is the number of particles in a mole.

One Chromebook is 11.6 inches long, which is approximately 0.2946 meters. Avogadro's number is 6.022 x 10^23.

So, the total length of a mole of Chromebooks lined up end to end would be:

0.2946 meters * 6.022 x 10^23 = 1.75 x 10^24 meters

The circumference of the moon is approximately 10,917 kilometers, which is equal to 10,917,000 meters.

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