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3 years ago

List two disadvantages of using synthetic dyes

Chemistry

2 answers:

balu736 [363]3 years ago

6 0

• Synthetic fibres are nonbiodegradable .

• Synthetic fibres melt and burn easily.

exis [7]3 years ago

3 0

Synthetic Dyes have mercury, lead, chromium and more chemicals. Exposure to this can be toxic and have severe effects on the human body!

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In the electron cloud model, if you begin at the electron shell closest to the nucleus of an atom and move out, what is the numb

Serga [27]

Option B: 2, 8, 18, 32.

2 in the K shell, 8 in L shell, 18 in M shell and 32 in N shell.

8 0

3 years ago

I need help on 4, this is theoretical yeild and writing the equation

Katyanochek1 [597]

Answer:

2.26 g

Explanation:

Data given:

mass of Sulfuric acid = 3.24 g

mass of Aluminum hydroxide = 0.945 g

Theoretical yield of Aluminum sulfate = ?

Solution:

First we look for the balance reaction

Reaction

3H₂SO₄ + 2Al(OH)₃ ----------> Al₂(SO₄)₃ + 6H₂O

Now we look for the limiting reactant on which the amount of aluminum sulfate depends

So,

3H₂SO₄ + 2Al(OH)₃ ----------> Al₂(SO₄)₃ + 6H₂O

3 mol 2 mol

from above reaction it is clear that 3 mole of H₂SO₄ combine with 2 mole of Al(OH)₃

Convert moles to mass

molar mass of Al(OH)₃

molar mass of Al(OH)₃ = 27 + 3(16 + 1)

molar mass of Al(OH)₃ = 27 + 45

molar mass of Al(OH)₃ =72 g/mol

molar mass of H₂SO₄

molar mass of H₂SO₄ = 2(1) + 32 + 4(16)

molar mass of H₂SO₄ = 2 + 32 + 64

molar mass of H₂SO₄ = 98 g/mol

So,

3H₂SO₄ + 2Al(OH)₃ ----------> Al₂(SO₄)₃ + 6H₂O

3 mol (98 g/mol) 2 mol (72 g/mol)

294 g 144 g

So its clear from the reaction that 294 g of H₂SO₄ react with 144 g of Al(OH)₃

now if we look at the given amounts the amount Al(OH)₃ is less then the amount of H₂SO₄

So, for Al(OH)₃ if we calculate the needed amount of H₂SO₄

So apply unity formula

294 g H₂SO₄ ≅ 144 g of Al(OH)₃

X g H₂SO₄ ≅ 0.945 of Al(OH)₃

Do cross multiplication

X g H₂SO₄ = 294 g x 0.945 g / 144 g

X g of H₂SO₄ ≅ 1.93 g

So, 1.93 g of H₂SO₄ will react out of 3.24 grams, the remaining amount of it will be in excess.

So,

Al(OH)₃ will be consumed completely an it will be limiting reactant.

-----------

Now to Calculate for the theoretical yield

First we look for the balance reaction

Reaction

3H₂SO₄ + 2Al(OH)₃ ----------> Al₂(SO₄)₃ + 6H₂O

Now we look for the mole mole ration of Al(OH)₃ to the amount of aluminum sulfate produced

So,

3H₂SO₄ + 2Al(OH)₃ ----------> Al₂(SO₄)₃ + 6H₂O

2 mol 1 mole

from above reaction it is clear that 1 mole of Al₂(SO₄)₃ produce by 2 mole of Al(OH)₃

As we know that

2 mole of Al(OH)₃ = 144 g

So,

if 144 g of Al(OH)₃ gives 1 mole Al₂(SO₄)₃ then how many moles of Al₂(SO₄)₃ will be produces by 0.945 g Al(OH)₃

So apply unity formula

144 g of Al(OH)₃ ≅ 1 mole of Al₂(SO₄)₃

0.945 g of Al(OH)₃ ≅ X mole of Al₂(SO₄)₃

Do cross multiplication

X mole of Al₂(SO₄)₃ = 0.945 g x 1 mole / 144 g

X mole of Al₂(SO₄)₃ = 0.0066 moles

So,

0.945 g of Al(OH)₃ produce 0.0066 mole of Al₂(SO₄)₃

Now conver moles of Al₂(SO₄)₃ to mass

Formula used:

mass in grams = no. of moles x molar mass . . . . . . (1)

molar mass of Al₂(SO₄)₃

molar mass of Al₂(SO₄)₃ = 2(27) + 3(32 +4(16))

molar mass of Al₂(SO₄)₃ = 54 + 3 (32 +64)

molar mass of Al₂(SO₄)₃ = 54 + 3 (96)

molar mass of Al₂(SO₄)₃ = 54 + 288

molar mass of Al₂(SO₄)₃ =342 g/mol

Put values in equation 1

mass in grams = 0.0066 g x 342 g/mol

mass in grams = 2.26 g

So the theoretical yield of Aluminum sulfate (Al₂(SO₄)₃ ) is 2.26 g

7 0

3 years ago

WILL MARK BRAINLIEST! PLEASE HELP!!

sergeinik [125]

Answer:Concrete is a heterogeneous mixture of an aggregate: cement, and water.

Sugar and sand form a heterogeneous mixture. If you look closely, you can identify tiny sugar crystals and particles of sand.

Ice cubes in cola form a heterogeneous mixture. The ice and soda are in two distinct phases of matter (solid and liquid).

Salt and pepper form a heterogeneous mixture.

Chocolate chip cookies are a heterogeneous mixture. If you take a bite from a cookie, you may not get the same number of chips as you get in another bite.

*Soda is considered a heterogeneous mixture. It contains water, sugar, and carbon dioxide, which forms bubbles. While the sugar, water, and flavorings may form a chemical solution, the carbon dioxide bubbles are not uniformly distributed throughout the liquid.

An example of homogenization is homogenized milk, which is processed so that the milk components are stable and don't separate.

In contrast, natural milk, while it might appear homogeneous when shaken, isn't stable and readily separates into different layers.

I hope that helped!

8 0

3 years ago

What is another name for this equipment and what does it do to reduce the impact of coal use?

slega [8]

Coal-fire power plants.

I hope this helps ya!

5 0

2 years ago

Which force acts an an object to move it from rest or a constant, straight-line motion?

maxonik [38]

Answer:

C. Unbalanced

Explanation:

A force which can change the state of an object by changing it's speed, position or direction of motion is known as an unbalanced force. It is the resultant of all forces which are acting on a body and causing a change in the state of rest of motion of the body.

Assume a box is resting on the floor. The forces acting on the box in the rest are Normal (by the ground on the box) in upward direction and gravitational force Mg (due to gravity). Although these two forces are acting on the box, it is still in rest because these forces are balanced to each other. When we pull or push the box by applying appropriate force, the box will start to move because the force applied by us is unbalanced and there is no any force in the opposite direction to make this force balanced.

8 0

3 years ago

List two disadvantages of using synthetic dyes​

List two disadvantages of using synthetic dyes