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3 years ago

6.

Chemistry

1 answer:

RUDIKE [14]3 years ago

3 0

Answer:

THE CURRENT REQUIRED TO PRODUCE 193000 C OF ELECTRICITY IS 35.74 A.

Explanation:

Equation:

Al3+ + 3e- -------> Al

3 F of electricity is required to produce 1 mole of Al

3 F of electricity = 27 g of Al

If 18 g of aluminium was used, the quantity of electricity to be used up will be:

27 g of AL = 3 * 96500 C

18 G of Al = x C

x C = ( 3 * 96500 * 18 / 27)

x C = 193 000 C

For 18 g of Al to be produced, 193000 C of electricity is required.

To calculate the current required to produce 193 000 C quantity of electricity, we use:

Q = I t

Quantity of electricity = Current * time

193 00 = I * 1.50 * 60 * 60 seconds

I = 193 000 / 1.50 * 60 *60

I = 193 000 / 5400

I = 35.74 A

The cuurent required to produce 193,000 C of electricity by 18 g of aluminium is 35.74 A

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1. Which of the following pairs of factors affects the solubility of a particular substance? (1 point)

Lina20 [59]

<h2>Question no 1:</h2><h3>Answer:</h3>

The correct answer is option A which is temperature and the nature of solute and solvent

<h3>Explanation:</h3>

The solubility of a substance is its ability to dissolve in a particular solution.
Solubility is highly dependent on the temperature and nature of solute and solvent.
It is directly proportional to the temperature. As we increase the temperature, the solubility of substantial increases but for the exothermic reactions, solubility is inversely proportional to temperature.
Solubility is absolutely dependent on the nature of solute and solvent, as polar solute and solvents have high solubility than non polar.

<h2>Question no. 2</h2><h3>Answer:</h3>

The correct answer is option B which is a large amount of solute.

<h3>Explanation:</h3>

A concentrated solution contains the maximum amount of solute which can be dissolved in the solvent.
For example, in water sugar solution concentrated solution will contain a large amount of sugar dissolved in water without the addition of heat.
In dilute solution, there is a small amount of solute.

<h2>Question no. 3:</h2><h3>Answer:</h3>

The correct answer is option B which is molarity × liters of solution.

<h3>Explanation:</h3>

Molarity of a solution is the total number of moles of solute per unit volume of solution.

Its formula is:

Molarity = Number of moles of the solute/volume of solution in liters.

A number of moles of solute = Molarity × Volume of the solution.

So the number of moles of solute is equal to the molarity and volume of solution. Hence correct option is B.

<h2>Question no 4.</h2><h3>Answer:</h3>

The correct answer is option D. Molarity of the dilute solution = 0.81 M

<h3>Explanation:</h3>

Given data:

initial volume = V1 = 225 mL = 0.225 L

Initial molarity = M1 = 0.80M

Final volume = V2 = 1 L

Final molarity = M2 = ?

Solution:

It is the dilution of the stock solution and the formula is given below:

V1M1 = V2M2

M2 = V1.M1/V2

By putting values in the formula:

M2 = 0.225 × 0.8/1

M2= 0.18

So the final molarity of the solution will be 0.18 M. Hence the correct answer is option D.

<h2>Question no. 5</h2><h3>Answer:</h3>

The correct answer is option B which is supersaturation.

<h3>Explanation:</h3>

Colligative properties of the solution are the properties which are not dependent on the number of particles of the solute in the solution.
While supersaturation of the solution means the solution containing the highest number of solute particles dissolved in the solution.
Since supersaturation is dependent on a number of solutes, it is not a colligative property.

<h2>Question no 6.</h2><h3>Answer:</h3>

The correct answer is option B/C, "which disrupts crystal formation of the solvent".

<h3>Explanation:</h3>

Depression of freezing point is the colligative property of the solution.
Which the lowering of the freezing point of a solution by adding the solute.
The addition of solute disrupts the crystal formation in the solvent, as it disrupts the intermolecular forces between solute particles.
Hence option B and C are the correct options because both have the same statement.

<h2>Question no 7.</h2><h3>Answer:</h3>

The correct answer is option D which is 142.

<h3>Explanation:</h3>

<u>Given data:</u>

Volume of solution = 167 ml

Percentage of solution = 85%

The volume of alcohol =?

<u>Solution:</u>

Percentage of solution ( v/v) = volume of solute/volume of solution × 100

The volume of solute = percentage × volume of solution/100

By putting values in above formula:

Volume of alcohol = 85 × 167/100 = 141.95 ml

<em><u>Hence the correct answer is option D which is approximately 142(141.95).</u></em>

8 0

3 years ago

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