#3 of thermo terms
If the heat of reaction, that is the enthalpy change AH, for a certain process is -19 kJ, that process
Select one:

Answer:

C.They are only magnetic if an electric current is running through them

Explanation:

Electromagnets are conductors which develop a magnetic field due to the electrons flowing through them. If the flow of electric current stops, the motion of the electrons stop and they do not generate their magnetic fields.

Answer:

An azeotropic compound is a mixture of two substances which distil at the same temperature. An azeotrope is a mixture of compounds with the same composition in the vapour as in the liquid.

Explanation:

Hope it helps!

An electrochemical cell can generate or use electrical energy. The mass of solid chromium that will be deposited on the electrochemical plate is 7.17 gm.

Current in an electrochemical cell is the ratio of the quantity of electricity in columns and time in seconds.

Given,

Current (I) = 0.350 A

Time = 21.7 hours

Molar mass of chromium = 52.0 g/mol

First time is converted into seconds:

1 hour = 3600 seconds

21.7 hours = 76020 seconds

The quantity of electricity flowing in the electrochemical solution is calculated as:

[tex]\begin{aligned} \rm Q & = \rm It\\\\& = 0.350 \times 76020 \\\\& = 26607\;\rm C \end{aligned}[/tex]

Electricity required for depositing 1 mole or 52.0 g chromium is calculated as:

In electrochemical solution, chromium chloride is dissociated as:

[tex]\rm CrCl_{2} \rightarrow Cr^{2+} + 2 Cl^{-} \\\\\rm Cr^{2+} +2 e^{-} \rightarrow Cr[/tex]

Two moles of electrons are needed to deposit 52.0 g of chromium.

If, 1 electron = 96500 C

Then, 2 electron = 193000 C

The mass of chromium deposited is calculated as:

193000 C = 52 g chromium

So, 26607 C = [tex]\dfrac{26607 \times 52}{193000} = 7.17 \;\rm gm[/tex]

Therefore, 7.17 gm of chromium is produced.

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Answer:

Strong acids completely ionize while weak acids partially ionize

Heavy water contains 20% hydrogen by mass and 80% oxygen by mass.

Heavy water is water which contains the heavy isotope of hydrogen, Hydrogen-2 in its molecules.

The mass of heavy water is greater than that of water.

The molar mass of heavy water is 20.0 g

The percentage composition of the elements in heavy water are as follows:

Hydrogen = 2 × 2g/20 g ×100% = 20%

Oxygen = 16g/20g × 100% = 80%.

Therefore, Heavy water contains 20% hydrogen by mass and 80% oxygen by mass.

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Answer:

OC

Explanation:

Is the only answer which implies a dilemma.

An ethical dilemma associated with prosthetics among the following is The future use of prosthetics to enhance a body part's natural function. Hence, Option (C) is correct

In medicine, a prosthesis, or a prosthetic implant, is an artificial device that replaces a missing body part, which may be lost through trauma, disease, or a condition present at birth.

Prostheses are intended to restore the normal functions of the missing body part.

Therefore, An ethical dilemma associated with prosthetics among the following is The future use of prosthetics to enhance a body part's natural function. Hence, Option (C) is correct

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If the pH of the acid at a given time is found to be 1.25, then the molarity  of the gastric acid juice is 0.056M.

pH is define as the negative logarithm of the concentration of H⁺ ions present in any solution and it will be represented as:

pH = -log[H⁺]

Concentration will be present in the form of molarity and pH value for gastric acid is given 1.25 means it is strong acid as it completely dissociates into their ions.

Required equation for calculation will be:

[H⁺] = [tex]10^{-pH}[/tex]

[H⁺] = [tex]10^{-1.25}[/tex]

[H⁺] = 0.056 M

Hence molarity of the gastric acid juice is 0.056M.

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Explanation:

the answer is in the image above

Urine has the color of pale yellow to deep amber. It is odorless and has a pH of 4.5-8.0

Answer:

Spriral

Explanation:

hope this helps

Answer:

12.125 moles of Z

Explanation:

Hi! Here, since you only know the number of moles for one of the reactants, you will use the coefficients in the reaction to use the mole ratio to find your answer. Since the question states that there are 4.85 mol A and excess B, A is your limiting reactant. This means that once all of the A is used up in the reaction, you will have your maximum amount of Z left behind because there will only be B left and no A to make more Z.

The mole ratio of A:Z is 2:5, found from the coefficients in the chemical equation(2 moles of A for every 5 moles of Z).

So, start with the information that is given to you (4.85 mol A) and then use the mole ratio, like this:

4.85 mol A([tex]\frac{5 mol Z}{2 mol A}[/tex])

This way, the mol A will cancel out, leaving behind mol Z (always put the unit you are looking for on top).

Doing this leads to mol Z = 12.125 mol.

I hope this helps! Good luck with your finals!

As per the given 4.85 moles of A will produce 12.125 moles of Z, assuming excess B.

A chemical reaction is the transformation of one or more substances, known as reactants, into one or more different substances, known as products.

Chemical reactions involve the breaking and forming of chemical bonds between atoms and molecules, causing atoms to rearrange and the chemical and physical properties of the substances involved to change.

From the balanced chemical equation, we can see that 2 moles of A react with 3 moles of B to produce 5 moles of Z.

So the mole ratio of A to Z is 2:5.

Therefore, if 2 moles of A react to produce 5 moles of Z, then 4.85 moles of A will produce:

(4.85 mol A) x (5 mol Z / 2 mol A) = 12.125 mol Z

Thus, 4.85 moles of A will produce 12.125 moles of Z, assuming excess B.

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hydrogen chloride(hydrogen, and chlorine

Answer:

A. it conducts electricity

Explanation:

A. Since Nitric Acid is a strong acid, which means it is a strong oxidizing agent, this makes Nitric Acid a good conductor of electricity.

B. Basic solutions are only going to form OH⁻ ions. A Nitric Acid solution will form H⁺ ions.

C. Alkaline substances (pH greater than 7) are more likely to turn blue, so HNO₃ would turn that blue into a red color.

D. I don't know much about phenolphthalein , all I know is that is is pink in Alkaline solutions (basic) and colorless in acidic solutions.  

I hope this helps, good luck!

Answer:

cyclobutane

Explanation:

(A) The mass number of the daughter product is 234.

(B) The atomic number of daughter product is 90.

(C) The isotope that remains after the alpha decay is thorium-234.

(D) The mass number of the daughter product is 4 less than the original atom.

(E) The atomic number of the daughter product is 2 less than the original atom.

The alpha decay of Uranium involves the emission of alhpa particles and thorium-234 as daughter product.

[tex]^{238}_{92}U\ ---- > \ \ ^4_2He \ + \ ^{234}_{90}Th[/tex]

From the equation of alpha decay of Uranium, we can infer the following;

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Answer:

In the total entropy of an isolated system, the thermal energy per unit temperature that is unavailable for doing useful work can never decrease.

Answer:

Hello the answer for the volcanos is here below:

7. Pipe

8. Crater

9. Vent

10. lava flow

11. magma chamber

Hope this helps :)

A light can be treated like a particle because light comes in chunks of energy called photons.

Photons are the small packets of energy and its energy will be represented by the following equation as:

E = hυ, where

h = plank's constant

υ = frequency

Light will be treated like a wave as well as of particle due to presence of this type of energy.

Hence correct statement is light comes in chunks of energy called photons.

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Answer:

B. Light comes in chunks of energy called photons.

Answer:

the awnser is d the other fuel produce more pollutants

Explanation:

because right out the bat we know that other  fuels produce more than a 15 percent fuel so the right awnser is d

Answer:

what is this i dont know what kind of math this is

Let's see

[tex]\\ \rm\Rrightarrow [M_3X_3]\leftrightharpoons {[M^{3+}]\atop 3x}+{[X^{3-}]\atop 3x}[/tex]

So

As solubility and molar mass given

[tex]\\ \rm\Rrightarrow [M_3X_3]=\dfrac{Solubility}{Molar\:mass}[/tex]

[tex]\\ \rm\Rrightarrow x=\dfrac{0.039}{108.64}[/tex]

[tex]\\ \rm\Rrightarrow x=0.00034M=3.4\times 10^{-4}M[/tex]

So

[tex]\\ \rm\Rrightarrow K_{sp}=(3x)(3x)=(3x)^2=9x²[/tex]

So

[tex]\\ \rm\Rrightarrow K_{sp}=9(3.4\times 10^{-4})^2=0.0000010404=104\times 10^{-6}mol^2L^{-2}=104\mu mol^2L^{-2}[/tex]

A good example of equilibrium would be the mixing of oil and water in a closed container.

Chemical equilibrium is a condition in which the concentrations of components of a chemical reaction remain unchanged and have no tendency to change.

Of all the options, the only one where the concentrations of the component reactants cannot change is a mixture containing oil and water in a closed container.

Oil and water are immiscible and thus, their concentrations remain constant.

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The statement that our energy supply is running out is false in accordance with the law of conservation of energy.

The law of conservation of energy states that the energy possessed by an object or physical body can neither be created nor destroyed, but it can only be transformed from one form of energy to another.

This ultimately implies that, we cannot run out of energy supply because the energy we generate from any source can't be destroyed in accordance with the law of conservation of energy.

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Answer:  D) If the reaction occurs in the gas phase

Explanation:

Answer:

3.50 Mol/L or M

Explanation:

450 mL / 1000 = 0.45 L

1 mole ------- 126.751 g

? mole ------- 200 g

moles = 200 * 1 / 126.751

moles = 200 / 126.751

= 1.57789 moles FeCl₂

M = n / V

M = 1.57789 / 0.45

= 3.50 Mol/L or M

Answer:

2.5 X 10^-43

Explanation:

CoS> Co + S

Co=X

S=X

X= 5.0 X 10^-22

Ksp= [X][X]

Ksp= [5.0 X 10^-22][5.0 X 10^-22]

Ksp= 2.5 X 10^-43

The Ksp for CoS is calculated as 2.5 × 10⁻⁶³ (mol/L)². This value represents the equilibrium constant for the dissociation of CoS in water and indicates the extent of its solubility in the solution.

The molar solubility of CoS is given as 5.0 × 10⁻²² mol/L. In the chemical equation for the dissolution of CoS in water, it dissociates into Co⁻²⁺ and S²⁻ ions.

The solubility product constant (Ksp) expression for CoS is written as:

Ksp = [Co²⁺] * [S²⁻]

Since CoS dissolves completely to form one Co²⁺ ion and one S²⁻ ion, we substitute the molar solubility values into the Ksp expression:

Ksp = (5.0 × 10⁻²² mol/L) * (5.0 × 10⁻²² mol/L)

Ksp = 2.5 × 10⁻⁴³ (mol/L)²

Therefore, the Ksp for CoS is calculated as 2.5 × 10⁻⁶³ (mol/L)². CoS has an extremely low solubility in water, resulting in an exceptionally small Ksp value.

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The minimum number of calories needed to change 40 g of water at 100°C to steam is 21600 calories

The heat needed to vaporise the water at 100 °C can be obtained as follow:

Q = m × ΔHv

Q = 40 × 540

Q = 21600 calories

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