where are class ii mhc found, and what cells recognize them?

Answer:

When 2-propanol (also known as isopropyl alcohol) reacts with sodium hypochlorite (NaOCl), the organic compound formed is isopropyl hypochlorite (also known as isopropyl chlorohydrin). This reaction can be represented as follows:

2-propanol + NaOCl -> isopropyl hypochlorite + NaOH

Isopropyl hypochlorite is a highly reactive compound and can decompose easily to form isopropyl alcohol and hypochlorous acid. The hypochlorous acid can then further decompose to form water and chlorine gas. However, in the presence of excess 2-propanol, the isopropyl hypochlorite is unlikely to decompose further, as the excess alcohol will react with any remaining hypochlorous acid to form more isopropyl hypochlorite.

Isopropyl hypochlorite should not be a contamination product in this synthesis because it is highly reactive and will decompose quickly to form stable, harmless compounds. Additionally, any excess 2-propanol will be removed during the workup of the reaction, so there should be little or no residual organic solvent left in the final product.

Explanation:

2-propanol is a better choice than sodium bisulfite to destroy excess sodium hypochlorite in synthesis, as the reaction with 2-propanol produces acetone and hydrochloric acid, which does not pose a contamination risk.

When 2-propanol reacts with sodium hypochlorite (NaOCl), it undergoes an oxidation reaction to form acetone and hydrochloric acid. The balanced chemical equation for the reaction is:

CH3CH(OH)CH3 + NaOCl → CH3COCH3 + NaCl + HCl + H2O

The formed product, acetone, is a common laboratory solvent and does not pose a contamination risk in the synthesis of the target compound. In contrast, if NaHSO3 were used to destroy excess NaOCl, it would result in the formation of sulfurous acid, which could contaminate the product and interfere with subsequent reactions. Therefore, using 2-propanol is a better choice to eliminate excess NaOCl.

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Answer:

The higher the temperature the faster the air molecules move. / The lower the temperature the slower the air molecules move.

Explanation:

Both answers work. Higher temp = more energy = moving faster, and the opposite applies. Lower temp = less energy = moving slower.

In the Lewis structure of methanol (CH3OH), the OH group is placed on the outside because it is an important functional group that influences the chemical properties and reactivity of the molecule.

The Lewis structure is a representation of a molecule that shows the arrangement of atoms and valence electrons. In methanol, carbon (C) is the central atom bonded to three hydrogen (H) atoms and one oxygen (O) atom. The oxygen atom forms a single bond with carbon and also has two lone pairs of electrons.

The placement of the OH group (hydroxyl group) on the outside of the Lewis structure is significant because it determines the chemical behavior of methanol. The OH group consists of an oxygen atom bonded to a hydrogen atom and represents the presence of an alcohol functional group.

In organic chemistry, functional groups are specific arrangements of atoms within a molecule that give rise to characteristic chemical reactions and properties. The presence and position of functional groups can greatly influence the behavior and reactivity of a compound. In the case of methanol, the hydroxyl group provides the molecule with its characteristic properties.

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Answer:

Neutralization occurs when a strong acid and a strong base come together in a chemical reaction to form water and salt.

Explanation:

not sure huhuhu

The standard enthalpy change for reaction (3) is 117.1 kJ.

The standard enthalpy change for reaction (3) can be calculated by using the enthalpy changes of reactions (1) and (2) and applying Hess's Law.

To do this, we need to manipulate the given equations so that the desired reaction (3) can be obtained.

First, we reverse reaction (1) to get the formation of C2H4(g) from C2H6(g):

C2H4(g)C2H6(g) ΔH° = -52.3 kJ

Next, we multiply reaction (2) by 2 and reverse it to obtain 2 moles of C2H6(g) reacting to form 3 moles of H2(g):

2C2H6(g)2C(s) + 3H2(g) ΔH° = 169.4 kJ

Now, we add the two modified equations together:

C2H4(g)C2H6(g) ΔH° = -52.3 kJ
2C2H6(g)2C(s) + 3H2(g) ΔH° = 169.4 kJ

When adding these equations, the C2H6(g) on the left side cancels out with the C2H6(g) on the right side, leaving us with the desired reaction (3):

C2H4(g) + H2(g)C2H6(g) ΔH° = -52.3 kJ + 169.4 kJ = 117.1 kJ

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Answer:large

Explanation: I got it right on the quiz

Answer: Large

Explanation: If you plucked a guitar string lightly, the string would vibrate and give off sound waves with small amplitudes. The resulting sound would be soft, with a low decibel level. If you then plucked the guitar string as hard as you could, the string would vibrate strongly and give off sound waves with large amplitudes. The resulting sound would be loud, with a higher decibel level.  

Answer:

Activation energy, in chemistry, the minimum amount of energy that is required to activate atoms or molecules to a condition in which they can undergo a chemical transformation or physical transport.

If the options are labelled A - D

Option C completes image 1

Option B completes image 2

A molecular model is a representation of a molecule using physical or virtual models. These models are used in chemistry and biochemistry to help understand the structure and properties of molecules.

We can see that adding one carbon atoms and three hydrogen atoms would complete the structure for propane and adding one hydroxyl group would complete the structure for ethanol.

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Answer:

Atomic mass is 10.81

Answer:

Evaporation is great for separating a mixture (solution) of a soluble solid and a solvent. The process involves heating the solution until the solvent evaporates (turns into gas) leaving behind the solid residue. ... This method is best for separating a liquid from a solution.

Filtration is a method for separating an insoluble solid from a liquid. When a mixture of sand and water is filtered: the sand stays behind in the filter paper (it becomes the residue ) the water passes through the filter paper (it becomes the filtrate )

Magnetic separation is the process of separating components of mixtures by using magnets to attract magnetic materials. ... Due to the magnets, magnetic particles are being drifted by the movement of the drums. This can create a magnetic concentrate (e.g. an ore concentrate).

Explanation:

That's your answer.

The concentration of the NaOH solution is 10.00 g/dm³.

To calculate the concentration in g/dm³ of a solution of NaOH containing 0.25 moles in 1 dm³, we need to know the molar mass of NaOH.

The molar mass of NaOH is calculated as follows:

Na (Sodium) = 22.99 g/mol

O (Oxygen) = 16.00 g/mol

H (Hydrogen) = 1.01 g/mol

Molar mass of NaOH = 22.99 g/mol + 16.00 g/mol + 1.01 g/mol = 40.00 g/mol

Now, we can calculate the concentration (C) using the formula:

C = (moles of solute) / (volume of solution in dm³)

C = 0.25 moles / 1 dm³

C = 0.25 mol/dm³

To convert moles to grams, we can multiply the molar mass by the number of moles:

Concentration in g/dm³ = (0.25 mol/dm³) * (40.00 g/mol)

Concentration in g/dm³ = 10.00 g/dm³

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Answer:

True

Explanation:

An ion in a molecule is formed with a net electrical charge. The electric charges are generated when the transfer of electrons takes place. In an ionic compound, a single element gains electrons (anion), and other elements lose electrons (Cation).

An anion is made when an element accepts or gains electrons and acquires a negative charge. Halogens such as fluorine, chlorine, bromine, and iodine always form anions, and some nonmetals also form anions such as carbon,  oxygen, and sulfur.

Hence, the given statement is True.

Answer:

9.38 moles NaNO₃

Explanation:

Given the measurements provided, the best way to find moles is by using the molarity formula. The molarity formula is:

Molar concentration (M) = moles / volume (L)

Therefore, plug the provided values into the formula, then isolate to find moles.

Molar concentration (M) = moles / volume (L)

0.750 M = moles / 12.5 L

(0.750 M) x (12.5 L) = moles

9.38 = moles

Both phosphorus and chlorine are non-polar because the four atoms of phosphorus (P4) cancel each other out and remain non-polar, while the two atoms of chlorine (Cl2) exert equal but opposite forces on one another and cancel each other out.

All four phosphorus atoms are connected to one another in the tetraphosphorus molecule shown below. Each phosphorus atom shares the same properties, which results in an identical electronegativity. Tetraphosphorus is hence nonpolar since each phosphorus atom's electron attraction in the two opposite directions is the same, canceling out one another.

The shared pair of electrons in a chlorine molecule (Cl2) is equally attracted by the two chlorine atoms, resulting in a nonpolar bond. as a result, chlorine is non-polar molecule.

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Answer:Particles in plasmas collide more often.

Plasma particles have high kinetic energy (they move quickly).

Plasma particles are far apart.

The ionized particles have no fixed volume

Explanation:

Plasma is the fourth form of matter which has freely moving electrons in it. The substance can be identified as plasma if its particles collide often and are far apart.

Plasma is a type of matter other than solids, liquids, and gas. They have similar properties to that of gas. Plasma particle collides are often like gases as they move freely in space. Like gases that have no definite shape and volume.

The plasma particles have ionic charges, positive and negative resulting in high kinetic energy. This property allows them to show electromagnetism and electrical conductivity.

The ionized particles are due to the high temperature that allows them to have the property of electrical conductivity and compression.

Therefore, the particles of plasma are ionized and have high kinetic energy.

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Answer:

Diatomic molecules consist of two atoms bonded together. In contrast, monatomic elements consist of single atoms (e.g., Ar, He). Many compounds are diatomic, such as HCl, NaCl, and KBr. Diatomic compounds consist of two different elements. There are seven pure elements that form diatomic molecules.

The percent yield of the reaction is 52.6%. The balanced chemical equation for the reaction between NaCl and NaHCO3 is:

2 NaCl + NaHCO3 → Na3CO3 + H2O + CO2

The molar mass of NaCl is 58.44 g/mol, and 9.97 g of NaCl corresponds to 9.97 g / 58.44 g/mol = 0.1705 mol of NaCl.

According to the equation, 1 mole of NaCl reacts with 1/2 mole of NaHCO3. So, the amount of NaHCO3 needed to react completely with 0.1705 mol of NaCl is:

0.1705 mol NaCl x (1/2) mol NaHCO3 = 0.08525 mol NaHCO3

The actual amount of NaHCO3 isolated is 3.77 g / 84.01 g/mol = 0.0449 mol NaHCO3.

The percent yield of the reaction is:

(actual yield / theoretical yield) x 100%

= (0.0449 mol / 0.08525 mol) x 100%

= 52.6%

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Explanation:

simply multiply value by 100

5450cm²

Answer:

a or b

Explanation:

Answer:

D. A or B

Explanation: The temperature of a substance cannot increase during phase change, so both A and B cannot happen simultaneously. And internal energy is the sum of the microscopic potential and kinetic energies of a substance, which increase with temperature and phase transition.

The cell supplies the potential energy

The bulbs become weaker

The brightness of the bulbs will increase

In a simple series circuit, there are two components connected in series, such as a resistor and a battery. When a voltage is applied across the circuit, the current flows through the resistor and then through the battery, in a continuous loop.

The voltage across the resistor is proportional to the current and the resistance of the resistor, according to Ohm's law, while the voltage across the battery remains constant.

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In the given reaction, the substance that is the base of the reaction is \(CaSO_4\). The correct option is C.

The base is a slippery liquid that is bitter and turns red litmus paper to blue.

Bases react with acids to form salts.

Then bases have pH above 7.

Examples of bases are calcium carbonate, sodium hydroxide, etc.

Thus, the correct option is C.

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Answer:

D. Ca(OH)2 (aq)

Explanation:

Correct on Edge 2022!!!

Good luck everyone, you got this! Have a great day!

Therefore, the molar mass of sodium thiosulfate is: (2 × 22.99 g/mol Na) + (2 × 32.06 g/mol S) + (3 × 16.00 g/mol O) = 158.11 g/mol

The molar mass (gram formula mass) for the compound sodium thiosulfate, Na2S2O3, can be calculated by adding the atomic masses of its constituent elements. The atomic mass of sodium (Na) is 22.99 g/mol, sulfur (S) is 32.06 g/mol, and oxygen (O) is 16.00 g/mol.
It is important to note that molar mass is a crucial concept in chemistry as it helps in determining the amount of substance present in a given sample. Sodium thiosulfate, with its molar mass of 158.11 g/mol, is commonly used as a fixative in photographic processing, in medical applications as an antidote for cyanide poisoning, and as a component in hair products. Its ability to dissolve in water and act as a reducing agent makes it an important compound in many industrial processes as well. Understanding the molar mass of compounds is essential for scientists to conduct experiments accurately and for industries to manufacture products efficiently.

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Answer:

the answer is convalent bonds

Explanation:

Strong linkages—called covalent bonds—hold together the hydrogen (white) and oxygen (red) atoms of individual H2O molecules. Covalent bonds occur when two atoms—in this case oxygen and hydrogen—share electrons with each other.

i hope this helped

The probability that a person has tuberculosis given a negative DNA indication is approximately 0.0005 or 0.05%.

To find the probability that a person has tuberculosis given a negative DNA indication, we can use Bayes' theorem. Bayes' theorem states that the probability of an event A given event B can be calculated using the formula: P(A|B) = (P(B|A) * P(A)) / P(B)

In this case, we want to find P(T|N), the probability of having tuberculosis given a negative DNA indication.

We are given the following information:

P(T) = Probability of having tuberculosis = 0.01 (given)

P(N) = Probability of a negative DNA indication (to be calculated)

To calculate P(N), we can use the complement rule:

P(N) = 1 - P(T) = 1 - 0.01 = 0.99

Now, we can plug the values into Bayes' theorem:

P(T|N) = (P(N|T) * P(T)) / P(N)

P(T|N) = (0.05 * 0.01) / 0.99

P(T|N) ≈ 0.0005

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The given reaction is the calcium carbide reaction of calcium hydroxide with water to produce acetylene.

The balanced equation is CaC2+2H2OCa(OH)2+C2H2.

Molar mass of acetylene, C2H2 = 2x12+2x1 = 26 g/mol

we get 64 g of CaC2 becomes 26 g of C2H2. 5.0g CaC2..

Molecular weight of Ca(OH)2=1(atomic weight of Ca)+2(atomic weight of O)+2(atomic weight of H)=40+2(16)+2(1)=40+32+2=74.

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The formal charge on the sulfur atom in the Lewis structure is zero.

The charge that would be present on an atom in a molecule if all of the bonding electrons were distributed equally is known as the formal charge of the atom. For each atom in a Lewis structure, you should count how many electrons it "owns" in order to determine the formal charges. All of its lone pair electrons as well as 50% of its bonding electrons should be counted. Essentially, the formal charge of an atom is the difference between its valence electrons and its own electrons.

Valence electrons of Sulfur = It is present in Group VI A = 6 valence electrons

Bonding electrons = 2 single bonds + 2 double bonds = 2(2) + 2(4) = 12 electrons

Electrons without lone pairs are non-bonding electrons.

Formal charge = 6 – 0 – 12/2 = 6 – 0 – 6 = 6 – 6 = 0

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