Determine the mass of ammonium chloride, NH4Cl, required to prepare 0. 250 L of a 0. 35 M solution of ammonium chloride

The replacement of the polar amino acid residue His 57 with a nonpolar residue in the chymotrypsin active site could impair the proper positioning of catalytic residues, potentially reducing or eliminating the enzyme's activity.

His 57 forms a hydrogen bond with Ser 195 in the chymotrypsin active site. His 57 is a polar amino acid residue, and its interaction with Ser 195 contributes to the proper positioning of the catalytic residues in the active site.

If His 57 were replaced by a nonpolar amino acid residue, such as alanine or valine, the hydrogen bond with Ser 195 would be lost. This could result in a change in the positioning of the catalytic residues in the active site, which could impair the ability of chymotrypsin to properly interact with its substrate and perform its enzymatic function. Therefore, the replacement of His 57 with a nonpolar amino acid residue could potentially reduce or eliminate the enzymatic activity of chymotrypsin.

Learn more on amino acid residue here;

https://brainly.com/question/14351754

#SPJ1

The balanced net ionic equation for the reaction between manganese(II) hydroxide, Mn(OH)2, and hydrochloric acid can be written as:

Mn(OH)2(s) + 2H+(aq) + 2Cl-(aq) → MnCl2(aq) + 2H2O(l)

In this reaction, the hydrogen ions (H+) from the hydrochloric acid react with the hydroxide ions (OH-) from the manganese(II) hydroxide to form water (H2O). The remaining chloride ions (Cl-) and manganese ions (Mn2+) combine to form manganese(II) chloride (MnCl2) in aqueous solution.

The net ionic equation removes spectator ions, which are ions that appear on both sides of the chemical equation and do not participate in the reaction. In this case, the spectator ions are the hydroxide ions (OH-) and the hydrogen ions (H+), which are present in equal amounts on both sides of the equation.

This net ionic equation accurately represents the chemical species that are involved in the reaction between Mn(OH)2 and HCl, making it useful for predicting the behavior of the reaction under different conditions.

Learn more about manganese here:

https://brainly.com/question/29288266

#SPJ11

Answer: The correct option is A) They have fixed energy values.

Explanation:

Electron is one of the sub-atomic particle present around the nucleus of an atom which is negatively charged.

In an atomic model, it is assumed that the electron revolves around the nucleus in discrete orbits having fixed energy levels.

These electrons when jumping from one energy level to another, some amount of radiation is either emitted or absorbed.

These fixed energy levels are given by the Bohr model and thus, the electrons are quantized.

Hence, the correct option is A) They have fixed energy values.

Answer: They have fixed energy values

Explanation: a pex

Answer:

who do I submit my questions to there is no submit or done sign I download this app for help not to waste my money and time. I need help with math please don't let us start off on the wrong foot

Answer:

(o) Al + NaOH + H2O -NaAlO2 + H2.

When aluminum oxide Al 2 O 3 reacts with sodium hydroxide solution, it forms sodium aluminate and water H 2 O . This reaction takes place at a temperature of 900 - 1100 ° C

A micelle is a tiny cluster of soap molecules arranged in a spherical shape with the hydrophilic (water-loving) heads pointing outwards and the hydrophobic (water-fearing) tails pointing inwards. When soap is added to water, these micelles form, with the hydrophilic heads being attracted to the water molecules and the hydrophobic tails being repelled by them.

When soap is applied to oily or dirty surfaces, the hydrophobic tails of the micelles attach to the oils and dirt, while the hydrophilic heads remain in contact with the water. This allows the micelles to surround and trap the oils and dirt, effectively suspending them in the water. The micelles can then be easily rinsed away, taking the oils and dirt with them, leaving the surface clean.

Overall, micelles play a crucial role in allowing soap to dissolve oils and dirt in water, making it an effective cleaning agent.
Hi! A micelle is a spherical structure formed by soap molecules when they interact with water. Here's a step-by-step explanation of how micelles enable soap to dissolve oils/dirt in water:

1. Soap molecules consist of a hydrophilic (water-attracting) head and a hydrophobic (water-repelling) tail.
2. When soap is added to water, the hydrophilic heads are attracted to the water, while the hydrophobic tails try to avoid it.
3. As a result, the soap molecules arrange themselves into a micelle, with the hydrophilic heads pointing outward and the hydrophobic tails pointing inward.
4. When oils/dirt come into contact with the soap solution, the hydrophobic tails of the micelle interact with the oils/dirt, trapping them inside the micelle.
5. The hydrophilic heads remain in contact with the water, allowing the micelle to be easily rinsed away, taking the trapped oils/dirt with it.

This is how micelles allow soap to dissolve oils and dirt in water, effectively cleaning surfaces.

To know more about soap visit:

https://brainly.com/question/27660538

#SPJ11

The new concentration of the above solution  would be 0.76 mol/L.

The most common way to solve this problem is to use the formula

c1V11=c2V2

In your problem,

c1  = 4.2 mol/L;  V1  = 45.0 mL

c2  = ?;  

V2  = 250 mL

c2=c1×V1V2 = 4.2 mol/L ×  45.0mL250ml  = 0.76 mol/L

This makes sense. You are increasing the volume by a factor of about 6, so the concentration should be about ¹/₆ of the original (¹/₆ × 4.2 = 0.7).

The amount of solvent which has been digested in a given volume of solvent or solution is evaluated by the optimizer concentration. A solution that includes a considerable amount of dissolved solute is said to be concentrated. A solution is said to be dilute if it only contains a little amount of dissolved solute.

Learn more about concentration here:

https://brainly.com/question/21841645

#SPJ4

The given statement "The molar enthalpy of sublimation of a given substance can be determined if its enthalpies of fusion and vaporization are known" is true.

The molar enthalpy of sublimation of a substance can be determined if its enthalpies of fusion (melting) and vaporization (boiling) are known. The enthalpy of sublimation refers to the energy required to change a substance from the solid phase directly to the gaseous phase, bypassing the liquid phase.

The enthalpy change during sublimation can be calculated by considering the enthalpies of fusion and vaporization. When a substance undergoes sublimation, it first requires energy to melt from the solid phase to the liquid phase (enthalpy of fusion) and then additional energy to vaporize from the liquid phase to the gaseous phase (enthalpy of vaporization). The sum of these two enthalpies represents the overall energy change during sublimation.

Therefore, by adding the enthalpy of fusion and the enthalpy of vaporization, one can determine the molar enthalpy of sublimation for a given substance.

Learn more about molar enthalpy from the link given below.

https://brainly.com/question/32136429

#SPJ4

The number of atoms in 0.0082g of gold is 2.50 x 10^19 atoms.

What is a molar mass in chemistry?

Molar mass is the mass of one mole of a substance, usually expressed in grams per mole (g/mol). It is a fundamental concept in chemistry that allows us to relate the mass of a substance to the number of atoms or molecules present.

The molar mass of gold (Au) is approximately 197 g/mol. To find the number of atoms in 0.0082 g of gold, we first need to calculate the number of moles of gold present:

moles of gold = mass of gold / molar mass of gold moles of gold = 0.0082 g / 197 g/mol moles of gold = 4.16 x 10^-5 mol

Next, we can use Avogadro's number (6.022 x 10^23 atoms/mol) to convert the number of moles to the number of atoms:

number of atoms = moles of gold x Avogadro's number number of atoms = 4.16 x 10^-5 mol x 6.022 x 10^23 atoms/mol number of atoms = 2.50 x 10^19 atoms

Therefore, there are approximately 2.50 x 10^19 atoms in 0.0082 g of gold.

To learn more about molar mass the link

https://brainly.com/question/837939

#SPJ1

Answer:

The light represented the Sun, and each of the flasks represented the atmosphere, but with different compositions. One flask had a higher carbon dioxide concentration than the other.

Explanation:

Answer:

The enthalpy of reaction is -185 kJ

Explanation:

To get the reaction:

 H₂(g) + Cl₂(g) → 2 HCl(g)

you must follow the following steps:

1)  Reactive molecules must break their bonds to obtain their atoms.

H₂(g) → 2 H(g)

Cl₂(g) → 2 Cl(g)

Bond energy (or enthalpy) is the energy required to break one mole of bonds of a gaseous substance. In the case of diatomic molecules with a single bond, it corresponds to the energy necessary to dissociate 1 mole of said substance in the atoms that form it.

Whenever you want to break links you must supply energy, so the link enthalpy will have positive values; while when a mole of bonds is formed energy is released and the bond enthalpy of this process will be negative.

In this case you will then have:

H₂(g) → 2 H(g)           ΔH=436 kJ/mol

Cl₂(g) → 2 Cl(g)         ΔH=243 kJ/mol

So the total energy needed to break all the bonds is:

ΔH=1 mol*436 kJ/mol +1 mol* 243 kJ/mol= 679 kJ

2) The atoms that were obtained in the break of the bonds must be combined to obtain the product.

2 H (g) + 2 Cl (g) → 2 HCl (g)

Being the single bond energy for one mole of 431 kJ H-Cl bonds and considering that two moles of H-Cl bonds are formed, the ΔH is:

ΔH = -2 moles* (432 kJ/mol) = -864 kJ

As mentioned, when a mole of bonds is formed energy is released, the bond enthalpy of this process will be negative.  So the formation of HCl is negative.

Hess's law states that the energy change in an overall chemical reaction is equal to the sum of the energy changes in the individual reactions comprising it. So:

ΔHtotal= -864 kJ + 679 kJ

ΔHtotal= -185 kJ

The enthalpy of reaction is -185 kJ

Answer:

Explanation:

Decomposition reaction, also known as analysis or dissociation, is a type of chemical reaction in which a compound breaks down into simpler substances or elements. In this reaction, a single reactant undergoes a chemical change and produces two or more products.

The decomposition reaction can be represented by the general equation:

AB → A + B

Where AB is the reactant, and A and B are the products. The reactant AB is usually a compound, and it breaks down into its constituent elements or simpler compounds.

There are different types of decomposition reactions, including:

Thermal decomposition: It occurs when a compound is heated, resulting in its decomposition into simpler substances. For example, the thermal decomposition of calcium carbonate (CaCO3) produces calcium oxide (CaO) and carbon dioxide (CO2):

CaCO3 → CaO + CO2

Electrolytic decomposition: It takes place when an electric current is passed through an electrolyte, causing it to break down into its component ions. For instance, the electrolysis of water (H2O) leads to the decomposition into hydrogen gas (H2) and oxygen gas (O2):

2H2O → 2H2 + O2

Photochemical decomposition: It occurs when a compound undergoes decomposition due to exposure to light energy. Chlorine gas (Cl2) can decompose into chlorine atoms (Cl) under the influence of light:

Cl2 → 2Cl

These are just a few examples of decomposition reactions. They are important in various chemical processes and are used in industries, laboratory experiments, and natural phenomena. By understanding and controlling decomposition reactions, scientists can gain insights into the behavior of different compounds and develop practical applications in fields such as chemistry, materials science, and environmental science.

Answer:

Explanation:

reaction in which a compound breaks down into simpler substances or elements

Fusion is the term used in science to describe the process wherein two lighter atoms collide to generate a heavier atom.

Nuclear fusion is the scientific name for what happens when two atoms collide to create a heavier atom.

When two unstable atoms are too close together, they combine to create a much heavier, more stable atom.

Energy is released during the recombination process by the substances that can be provided by the mass energy equivalence,

E = Δmc².

Where c is the speed of light and m is the change in mass caused by the recombination

To know more about nuclear fusion, visit,

https://brainly.com/question/17870368

#SPJ4

Answer:

cytsdfywty ++=

Explanation:

V-pneumonoultramicroscopicsilicovolcanoconiosis

The IUPAC name for the compound 2-bromobutanal is 2-bromobutane-1-al.


The IUPAC name for the compound 3-bromobutanone is 3-bromobutane-1-one.  The IUPAC name for the compound 2-bromobutanone is 2-bromobutane-1-one. The IUPAC name for the compound 3-bromobutanal is 3-bromobutane-1-al.
The given compound is a ketone, identify the longest carbon chain that includes the carbonyl group, then change the -e ending of the corresponding alkane name to -one, which is the suffix for a ketone.

We can see that the carbonyl group is located at the second carbon atom of the parent chain, and the parent chain is the butane which has four carbon atoms. The name of this ketone is 2-bromobutanone because the bromine atom is bonded to the second carbon atom of the parent chain. Hence, the correct option is c. 2-bromobutanone.

Read more about carbonyl :

https://brainly.com/question/13564853

#SPJ11

It is very dangerous to hear anything loud or cause any impact or shock while working with nitroglycerin because it can cause an explosion. Therefore, you cannot hear a dump truck driving through a nitroglycerin plant due to the danger it poses to the employees and the facility.

Nitroglycerin is an explosive material that is highly sensitive to impact, heat, or friction. It is also a primary explosive, which means that it can detonate by itself without any external stimulus. This property makes nitroglycerin one of the most dangerous substances on the planet. As a result, it is always stored in a safe location and transported with the utmost care and security to prevent accidental explosions.

When working with nitroglycerin, it is essential to follow strict safety protocols and procedures to ensure the safety of the employees and the facility. Any loud noise or impact can cause a shock wave that can trigger an explosion. Therefore, it is vital to maintain a quiet environment to avoid any unnecessary risks or accidents.

You cannot hear a dump truck driving through a nitroglycerin plant because it is incredibly dangerous to do so. The vibration and noise generated by the truck can cause a shock wave that can trigger an explosion. Therefore, the facility's employees must maintain a quiet environment and avoid any loud noises or vibrations that can cause an accident or explosion.

Learn more about nitroglycerin here:

https://brainly.com/question/6347387

#SPJ11

When the gas is heated from -50°C to 28°C, the new volume is approximately 17.24 L.

To calculate the new volume of a gas when it is heated from -50°C to 28°C, we can use the combined gas law, which relates the initial and final conditions of temperature and volume.

The combined gas law is expressed as:

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

Where:

P1 = Initial pressure

V1 = Initial volume

T1 = Initial temperature in Kelvin

P2 = Final pressure (assumed constant in this case)

V2 = Final volume (to be calculated)

T2 = Final temperature in Kelvin

First, we need to convert the initial and final temperatures from Celsius to Kelvin:

Initial temperature in Kelvin (T1) = -50°C + 273.15 = 223.15 K

Final temperature in Kelvin (T2) = 28°C + 273.15 = 301.15 K

Since the pressure is assumed to be constant, we can simplify the equation:

(V1 / T1) = (V2 / T2)

Now we can substitute the given values into the equation:

(12.78 L / 223.15 K) = (V2 / 301.15 K)

Cross-multiplying and solving for V2:

V2 = (12.78 L * 301.15 K) / 223.15 K

V2 ≈ 17.24 L

For more such question on volume. visit :

https://brainly.com/question/1972490

#SPJ8

Answer:

See explanation

Explanation:

1) The formula of the compound is Fe2(SO4)3. There are two ion atoms in any formula unit as we can see here. Three sulphate ions are attached to iron. Each iron ion carries a +3 charge as we saw in the formula. The total positive charge in each formula unit is +6.

Changing a subscript in a correctly written chemical formula changes the formula so that it no longer represents the compound it previously represented. Hence FeSO4 is a different compound from Fe2(SO4)3.

For getting an indication whether a chemical reaction or chemical change has taken place, if  B)Heat is given off then chemical reactions occur. So,correct option is B.

Chemical reactions are surrounding us, from the digestion of food in our body to how the light we get from the sun is the consequence of compound responses. Prior to starting with compound responses, realizing about physical and synthetic changes is significant

Option A can't be the response is dissolving is an actual change. No substance response occurred.

Option B is the response as it is an EXOTHERMIC reaction so intensity will be emitted.

Option C can't be the response as dissolving is essentially ions becoming particles, not a synthetic response by which a reactant responds with one more reactant to shape an item.

Option D can't be the response. Same explanation with respect to why An isn't the response.

Hence, correct option is B.

To know more about chemical reactions, visit here:

https://brainly.com/question/29762834

#SPJ4

(Complete question) is:

When determining whether a chemical reaction has taken place, you observe and look for several indicators. Which would be considered an indication that a chemical reaction or chemical change has taken place? A) Solid melts. B) Heat is given off. C) Substance dissolves D) Substance changes shape.

Answer:

atomic weight..................

Answer:

C. Density

all the others are chemical properties

Answer:

C: Density

Explanation:

The boiling point of a 2.5 M glucose solution is 100 °C + 1.28 °C = 101.28 °C

The boiling point of a solution is defined as the temperature at which the vapor pressure of the solution becomes equal to the external pressure of the atmosphere. When a solute such as glucose is added to a solvent such as water, the boiling point of the resulting solution is different from that of the solvent alone. This is due to the fact that the presence of solute particles raises the boiling point of the solution.In general, the boiling point of a solution increases as the concentration of the solute increases. This is known as boiling point elevation. The magnitude of the boiling point elevation depends on the concentration of the solute as well as the nature of the solvent and solute.The boiling point of 2.5 M glucose can be determined using the formula:ΔTb = Kb * molalitywhere ΔTb is the change in boiling point, Kb is the boiling point elevation constant, and molality is the concentration of the solute in mol/kg.For water, the boiling point elevation constant is Kb = 0.512 °C/m. Therefore, if we assume that the density of the solution is 1 kg/L (which is approximately true for dilute solutions), then we can calculate the molality as follows:molality = moles of solute / mass of solvent in kgFor a 2.5 M glucose solution, the molality is:molality = 2.5 moles / 1 kg= 2.5 mol/kgUsing the boiling point elevation formula, we can calculate the change in boiling point:ΔTb = Kb * molality= 0.512 °C/m * 2.5 mol/kg= 1.28 °C.

for more questions on boiling point

https://brainly.com/question/40140

#SPJ8

Solutions 1 and 3 because they are strong acids and a strong base. Option A.

Strong acids and strong bases are completely ionized in an aqueous solution. Weak acids and weak bases also ionize, but only partially and the reaction is reversible. So you know if an acid or base is strong or weak. A simple way to determine strength is to add the acid or base to water. A higher reactivity means a stronger acid or base.

One of the simplest tests to determine whether a solution is an acid or base is the litmus paper test. To do this, dip a special strip of paper so-called litmus paper into the solution and observe the color of the paper. Litmus paper turns red in acidic solutions and blue in basic solutions. Sodium hydroxide is the strongest base because it completely dissociates to form sodium and hydroxide ions. These hydroxide ions are further treated with hydrogen ions by an acid to completely ionize the hydrogen ions.

Learn more about Experiment here:-https://brainly.ph/question/672153

#SPJ1

Answer:

Sound waves cannot propagate in vacuum. Air is needed for sound waves to travel and there is no air in vacuum.

Explanation:

The property of fluids that enables ships and balloons to float is known as buoyancy, which is a result of the Archimedes' principle.

Buoyancy is the upward force exerted by a fluid on an object immersed in it. It is responsible for the floating of ships and balloons. The concept of buoyancy is based on Archimedes' principle, which states that an object immersed in a fluid experiences an upward force equal to the weight of the fluid displaced by the object.

When a ship or a balloon is placed in a fluid, such as water or air, it displaces a certain volume of the fluid. The displaced fluid exerts an upward force on the object, which counteracts the downward force of gravity. If the weight of the object is less than the weight of the fluid it displaces, the object will experience a net upward force and will float.

In the case of a ship, its hull is designed to displace a large volume of water, creating a buoyant force that supports the weight of the ship and its cargo. Similarly, in the case of a balloon, the gas inside the balloon is less dense than the surrounding air, causing the balloon to float upward.

To learn more about buoyancy refer:

https://brainly.com/question/2131020

#SPJ11

Answer:

load

Explanation:

the load is the work done by the effort on the machine

As per the given equation, 10.7 L of \(C_2H_2\) react with 25 L of oxygen at STP.

To determine the liters of  \(C_2H_2\) needed to react with 25 L of oxygen at STP, we need to use the given balanced chemical equation to find the mole ratio of  \(C_2H_2\) to oxygen, and then use the ideal gas law to calculate the volume of  \(C_2H_2\).

From the balanced chemical equation,

2 moles of  \(C_2H_2\) react with 5 moles of oxygen.

So, the mole ratio of  \(C_2H_2\) to oxygen is 2:5.

At STP, one mole of any gas occupies 22.4 L.

Therefore, 25 L of O2 at STP is equal to 25/22.4 = 1.116 moles of oxygen.

Using the mole ratio of  \(C_2H_2\) to oxygen, we can find the moles of  \(C_2H_2\) that react with 1.116 moles of O2.

2 moles of  \(C_2H_2\) react with 5 moles of oxygen.

So, (2/5) x 1.116 = 0.4464 moles of  \(C_2H_2\) react with 1.116 moles of oxygen.

Finally, we can use the ideal gas law to calculate the volume of 0.4464 moles of  \(C_2H_2\) at STP.

PV = nRT, where P = 1 atm, V = volume in liters, n = number of moles, R = 0.0821 L atm/(mol K), T = 273 K.

V = nRT/P = (0.4464 mol) x (0.0821 L atm/(mol K)) x (273 K) / (1 atm) = 10.7 L

Therefore, 10.7 L of  \(C_2H_2\) react with 25 L of oxygen at STP.

For more details regarding combustion, visit:

https://brainly.com/question/11889647

#SPJ1