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allochka39001 [22]
2 years ago
10

Which of the following are examples of a chemical change?

Chemistry
1 answer:
tamaranim1 [39]2 years ago
3 0

burning of paper, digestion of food are the example of chemical change

digestion of food is a chemical change because if we digest a food than it will come out in the dorm of stool so can we again change that stool into food

no so it is chemical change

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2 years ago
Calculate the mass percentage of Na2SO4 in a solution containing 10.9 g Na2SO4 in 482 g water.
boyakko [2]

Answer:

The answer to your question is 2.21 %

Explanation:

Data

mass of Na₂SO₄ = 10.9 g

mass of H₂O       = 482 g

Formula

Percent by mass = \frac{mass of solute}{total mass} x 100

Substitution

Percent by mass = \frac{10.9}{10.9 + 482} x 100

Simplification and result

Percent by mass = \frac{10.9}{492.9} x 100

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3 0
3 years ago
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zhuklara [117]

Answer:

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Explanation:

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In 3.8 moles of li, there are about <span>0.144071459 grams. I assume that you are talking about lithium.</span>
7 0
3 years ago
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