write equations for the reaction of phenylalanine with a. ch3ch2oh and h b. c6h5cocl and base c. acetic anhydride

Answer:

The atom that loses the electrons becomes a positively charged ion, while the one that gains them becomes a negatively charged ion

Answer:

The density of the 19.0% by mass ethylene glycol solution in water is approximately 1.02 g/ml.

Explanation:

To solve this problem, we need to determine the density of the ethylene glycol solution, which is given as 19.0% by mass. Let's calculate the density of the solution.

Let's assume we have 100 grams of the ethylene glycol solution.

The mass of ethylene glycol in the solution is 19.0 grams (19.0% of 100 grams).

The mass of water in the solution is 81.0 grams (100 grams - 19.0 grams).

Now, we need to determine the volume of the solution. We can use the density of the solution, which is given as 1.02 g/ml.

Let V represent the volume of the solution in milliliters.Using the density formula:

Density = Mass / Volume, we can rearrange it to solve for Volume: Volume = Mass / Density.

For the ethylene glycol solution,

Volume = (19.0 grams + 81.0 grams) / 1.02 g/ml

= 100 grams / 1.02 g/ml

≈ 98.04 ml.

Therefore, the volume of the ethylene glycol solution is approximately 98.04 ml.

To obtain the density of the solution, we divide the total mass (100 grams) by the total volume (98.04 ml):

Density = 100 grams / 98.04 ml

≈ 1.02 g/ml.

Therefore, the density of the 19.0% by mass ethylene glycol solution in water is approximately 1.02 g/ml.

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The salt that produces a basic solution when dissolved in water is NH4Cl (ammonium chloride).

When a salt is dissolved in water, it dissociates into its constituent ions. To determine whether the resulting solution is acidic, basic, or neutral, we examine the nature of the ions produced. In the case of NH4Cl, it dissociates into ammonium ions (NH4+) and chloride ions (Cl-).

Ammonium ions (NH4+) can act as a weak acid by donating a proton (H+) to water molecules, resulting in the formation of hydronium ions (H3O+). This process creates an excess of H3O+ ions, making the solution acidic. However, chloride ions (Cl-) are the conjugate base of a strong acid (HCl) and do not affect the pH significantly.

Since the contribution of NH4+ ions to acidity is greater than the contribution of Cl- ions to basicity, the net effect is an acidic solution. Therefore, NH4Cl produces an acidic solution when dissolved in water.

To obtain a basic solution, we would need a salt with an anion that can accept protons (H+) from water molecules, thereby increasing the concentration of hydroxide ions (OH-) and resulting in a basic pH. None of the given options (NaNO3, NaF, NH4Cl, FeCl3) fulfill this criterion except NH4Cl.

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The claim that vinyl gloves have a higher leak rate than latex gloves is supported by the study at a significance level of 0.005.

To determine if vinyl gloves have a higher leak rate than latex gloves, we can conduct a hypothesis test.

The z-value is calculated as:

z = (p₁ - p₂) / √((p₁(1 - p₁) / n₁) + (p₂(1 - p₂) / n₂))

where p₁ and p₂ are the sample proportions, and n₁ and n₂ are the sample sizes.

Certainly! Let's calculate the z-value to determine if vinyl gloves have a higher leak rate than latex gloves.

For vinyl gloves:

Sample size (n₁) = 240

Leaking gloves (x₁) = 0.63 * 240 = 151.2 (approximated to 151)

For latex gloves:

Sample size (n₂) = 240

Leaking gloves (x₂) = 0.07 * 240 = 16.8 (approximated to 17)

We will calculate the z-value using the formula:

z = (p₁ - p₂) / √((p₁(1 - p₁) / n₁) + (p₂(1 - p₂) / n₂))

where p₁ and p₂ are the sample proportions.

p₁ = x₁ / n₁ = 151 / 240 ≈ 0.629

p₂ = x₂ / n₂ = 17 / 240 ≈ 0.071

Calculating the z-value:

z = (0.629 - 0.071) / √((0.629 * (1 - 0.629) / 240) + (0.071 * (1 - 0.071) / 240))

z ≈ 13.239

The calculated z-value is approximately 13.239. To determine if the claim is supported, we compare this value to the critical z-value for a one-tailed test at a significance level of 0.005.

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Answer:

440.8 mL

Explanation:

35+411= 446 mL

446-5.20=440.8 mL

Answer:

409

Explanation:

I'm not sure if the 35 is part of the question or if it is the question number. It looks to me like the question number.

411 mL - 5.20 mL = 405.8

Now the question is how fussy is your instructor about significant digits?

There are actually only 3 So the answer should be 409 mL

To achieve a [Cu(CN)₄²⁻] concentration of 2.0 × 10⁻⁵ M, a Cu²⁺ concentration of 1.4 × 10⁻¹² M is required in a solution with a [CN⁻] of 9.3 × 10⁻⁴ M when Kf of Cu(CN)₄²⁻ is 1.0 × 10²⁵.

Kf is the equilibrium constant, which is a measure of the energy required to create a complex ion in the presence of a given ion concentration. This suggests that, by complexation reactions, Cu2+ and CN- ions may form Cu(CN)42- ions.

Kf= [Cu(CN)4²⁻]/[Cu²⁺][CN⁻]⁴I put Kf= 1.0 × 10²⁵,

[CN⁻]=9.3 × 10⁻⁴, and [Cu(CN)₄²⁻]=2.0 × 10⁻⁵in the equation to find [Cu²⁺]: 1.0 × 10²⁵= 2.0 × 10⁻⁵/([Cu²⁺](9.3 × 10⁻⁴)⁴). Finally, you can calculate the concentration of Cu²⁺ by rearranging the equation:Cu²⁺=1.4 × 10⁻¹² M.

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Answer:

1.

protons neutrons electrons

1 1 1

6 6 6

26 30 26

79 118 79

Explanation:

protons and electrons are same

4,455 joules of heat are needed to raise the temperature of 15.0 grams of aluminum from 22.5°C to 55.5°C.

First, we need to calculate the amount of energy required to raise the temperature of 15.0 grams of aluminum from 22.5°C to 55.5°C. We can use the following formula:

Q = m * c * ΔT

Where

We need to convert the mass of aluminum from grams to kilograms:

m = 15.0 g = 0.015 kg

Now we can substitute the values into the formula:

Q = (0.015 kg) * (9.0 x 10² J/kg°C) * (55.5°C - 22.5°C)

Q = (0.015 kg) * (9.0 x 10² J/kg°C) * (33°C)

Q = 4,455 J

Therefore, 4,455 joules of heat are needed to raise the temperature of 15.0 grams of aluminum from 22.5°C to 55.5°C.

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When \(CO_{2}\) and \(H_{2} CO_{3}\) are both horizontal lines, the rate of the forward reaction is the same as the rate of the reverse reaction. The reaction is occurring at equilibrium, with no net change in the concentrations of reactants and products over time.

When the concentration of carbon dioxide \(CO_{2}\) and the concentration of carbonic acid \(H_{2} CO_{3}\) are both horizontal lines, it indicates that their concentrations remain constant over time. In such a scenario, the rate of the forward reaction is the same as the rate of the reverse reaction. A horizontal line on a concentration-time graph suggests that the concentrations of the reactants and products are not changing, implying that the reaction has reached equilibrium. At equilibrium, the rate of the forward reaction equals the rate of the reverse reaction. This is a fundamental principle of chemical equilibrium, described by the principle of microscopic reversibility.

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Carbon₁₄ is the radioactive isotope, while carbon₁₂ is stable and non-radioactive.

Carbon₁₄ and Carbon₁₂(C-12) are isotopes of carbon, with C₁₄ having 2 more neutrons than C₁₂. C₁₄ is a radioactive isotope, which means that its nucleus is unstable and undergoes decay over time, emitting radiation in the form of particles and energy. C₁₂, on the other hand, is stable and does not undergo decay.

Overall, the differences between C₁₄ and C₁₂ make them useful for different applications. C₁₄ is used in radiocarbon dating, while C₁₄ is used in many other fields, such as isotope labeling in chemistry and stable isotope analysis in environmental science.

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Answer:

Potential energy

Explanation:

\(p.e = mgh\)

Answer:

A. mass

Explanation:

On edgenuity 2020

The property of matter that is conserved in chemical reactions is mass. The correct option is A.

The law of conservation of mass implies that mass is never be created nor destroyed in a chemical reaction.

The law of conservation of mass, also known as the principle of mass conservation, implies that for any system closed to all transfers of matter and energy.

The mass of the system must remain constant over time, because the system's mass cannot change, and thus quantity cannot be added or removed.

The law of conservation of mass was critical to the advancement of chemistry.

It assisted scientists in understanding that substances did not disappear as a result of a reaction, as they may appear to do, but rather transformed into another substance of equal mass.

Thus, the correct option is A.

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The given acid, we can substitute the Ka and [HA] to solve for the [H+] concentration at equilibrium \([H+] = 2 \times 10^{-6}M\)

Equilibrium is a state of balance or stability of a system. It is the state in which the forces that act on the system are balanced, and the system is not subjected to any external force. Equilibrium is a dynamic state, meaning that the system is in constant flux and is always changing in response to its environment.

At equilibrium, the [H+] concentration of a monoprotic acid (HA) is determined by its acid dissociation constant (Ka). The Ka is a measure of the strength of an acid and is related to the [H+] concentration at equilibrium by the following equation:
Ka = [H⁺][A⁻]/[HA]
For the given acid, Ka = 2 x 10⁻⁵. We also know that the initial HA concentration is 0.1M.
We can rearrange the Ka equation to solve for [H⁺]:
[H⁺] = Ka x [HA]/[A⁻]
Since [A⁻] = [HA] (since they are in equilibrium), we can simplify the equation to:
[H⁺] = Ka x [HA]
For the given acid, we can substitute the Ka and [HA] to solve for the [H⁺] concentration at equilibrium:
[H⁺] = (2 x 10⁻⁵) x (0.1M)
\([H+] = 2 \times 10^{-6}M\)

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The calculated maximum wavelength is 495 nm

The energy needed to break a bond and create two atomic or molecular fragments, each containing one of the original shared pair of electrons, is known as the bond dissociation energy. The link between silicon and fluorine, which was previously discussed, is discovered to be the strongest chemical bond. The initial silicon-fluorine bond in a silicon tetrafluoride molecule requires 166 kcal/mol of bond dissociation energy to be broken.

ΔH=+240 kJ/mol

E=242×103/6.022×1023

=4.0186×10−19 J

Now I use the Planck Expression:

E=hf=hc/λ

∴λ=hc

Eλ=6.63×10−34×3×108/4.0186×10-19 m

λ=4.949×10−7 m

λ=495 nm.

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Answer:

A. 1.73 m = 172 cm

B. 7,651.27 m = 7.65127 Km

Answer:

m = 1.5 gram

Explanation:

Given that,

Density of protein gelatin, d = 3 g/L

The volume of protein gelatin, V = 0.5 L

We need to find the mass of the protein gelatin. The density of an object is given by :

d = m/V

Where

m is mass

\(m=d\times V\\\\m=3\ g/L\times 0.5\ L\\\\m=1.5\ g\)

So, the required mass is 1.5 gram.

Answer:

gamma rays

Explanation:

gamma Ray's have the highest frequency

When an electrical current is applied to an aqueous solution of lithium sulfide, hydrogen gas will be produced at the cathode and sulfur will be produced at the anode.

At the cathode, positively charged hydrogen ions (H+) gain electrons and are reduced to hydrogen gas (H2).2H+ + 2e- → H2

At the anode, negatively charged sulfide ions (S2-) lose electrons and are oxidized to form elemental sulfur (S).

S2- → S + 2e-

It's worth noting that lithium ions (Li+) will also be present in the solution but they will not be produced at either the anode or cathode.

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Step 1 convert lbs to kg step 2 kg to g 3rd step g to mg

Here given data is 0.47 pound then we have to convert how many miligram = ?

So here 0.47 pound (lbs) = 0.2131 kg

1 kg = how many gram then 1kg = 1000 gram

So, 0.2131 kg = 213.1 gram

So 1 gram = 1000 mg then  

So, 213.1 gram = 0.2131 mg

Then here three conversion are seen means step 1 =0.47 pound (lbs) = 0.2131 kg to step 2 = 2131 kg = 213.1 gram to step 3 = 213.1 gram = 0.2131 mg

This is the conversion from beginning to ending

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Answer:

The kinetic energy of the molecules increases

Explanation:

Because when the water is heated up more kinetic energy is added.

While solids have certain shape and volume, liquids only have definite volume but not shape, gases neither have shape nor volume. The level of energy is highest in gases, medium in liquid and lowest in solids. The compression of solids is difficult, liquids are nearly incompressible, but gases can be easily compressed.

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Answer:

1.37cm

Explanation:

It's less than 1.4cm but more than 1.3cm. It's also more than 1.35cm so I guess the best answer would be 1.37cm or round up to 1.4cm

vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvv

Answer:

True

Explanation:

The endocrine system's main function is to distribute hormones throughout the body.

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The energy in Ha for the second excited state of hydrogen (h[0,0,1]) is -1.51 Ha.

To calculate the energy of hydrogen in its second excited state, we need to use the formula for the energy of a hydrogen atom:

E = -13.6 ha / n^2

Where E is the energy in hartrees (ha), and n is the principal quantum number. In this case, n = 3, so we can plug that into the formula:

E = -13.6 ha / 3^2

E = -13.6 ha / 9

E = -1.51 ha

Therefore, the answer is E = -1.51 Ha.

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