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3 years ago

Plz help..........................

Chemistry

1 answer:

denis23 [38]3 years ago

8 0

Answer:

this is because aluminium is a non renewable source of material. the process to mine it is expensive. the process releases greenhouse gases which are harmful to the environment. it takes a long time to extract the aluminium. it is a way to help reduce waste products.

( this answer will only get you about 5 marks you need one more point in your answer. I just couldn't be bothered to think about another one.)

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A sample of seaweed contains 1 liter of water and has 50 grams of salt dissolved in its cells. The seaweed is placed in a soluti

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seaweed having 50 g salt in 1 L water. The bucket contains 150 g of salt in 2 L of water

amount of water present in bucket is twice to amount of water in weed

$V¬_water bucket=2×V_water weed$

At equilibrium, volume of water in weed is x and volume in bucket is y but concentration remain same as follows:

$50 /x=150 /y\\ Y = 3 x$

At equilibrium, weed loose z L from 1 L water to bucket containing 2 L as follows:

$(2 + z) = 3 (1-z)\\ (2 + z) = 3 – 3 z\\ Z = 0.25 L$

Thus, Weed will loose 0.25 L of water

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3 years ago

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How many quarts of pure antifreeze must be added to 5 quarts of a 20 ntifreeze solution to obtain a 50 ntifreeze solution?

Ede4ka [16]

Quarts of pure antifreeze must be added to 5 quarts of a 20 antifreeze solution to obtain a 50 antifreeze solution is 3.

Antifreeze solution is a solute that lowers the freezing point of the liquid in a solution.

For calculating the amount of quarts of pure antifreeze solution added can be given by:

5×20/100 + x × 100% = (x+5) × 50/100

Where, x is the amount of antifreeze required for addition and pure antifreeze is 100% of the antifreeze taken.

1 + x = (x+5) 0.5

1 + x = 0.5x + 2.5

0.5x = 1.5

x = 3

So, 3 quarts of pure antifreeze must be added to 5 quarts of a 20 antifreeze solution to obtain a 50 antifreeze solution.

Learn more about Antifreeze solution here, brainly.com/question/14619701

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2 years ago

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Answer is pH.
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4 years ago

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Answer: The chemical formula of this precipitate is $Mg_{3}(PO_{4})_{2}$ .

Explanation:

An equation which depicts the chemical reaction of substances in the form of chemical formulas is called a chemical equation.

For example, chemical equation for an aqueous solution of sodium phosphate $(Na_{3}PO_{4})$ and an aqueous solution of magnesium sulfate $(MgSO_{4})$ are mixed, a precipitate forms is as follows.

$3MgSO_{4}(aq) + 2Na_{3}PO_{4}(aq) \rightarrow Mg_{3}(PO_{4})_{2}(s) + 3Na_{2}SO_{4}(aq)$

Here, trimagnesium phosphate is the precipitate. The chemical formula of this precipitate is $Mg_{3}(PO_{4})_{2}$ .

Thus, we can conclude that the chemical formula of this precipitate is $Mg_{3}(PO_{4})_{2}$ .

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3 years ago

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Ca(OH)2

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