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LuckyWell [14K]
3 years ago
13

The most abundant elements in the body are _____.

Chemistry
2 answers:
umka21 [38]3 years ago
7 0
Oxygen carbon and hydrogen
Alika [10]3 years ago
6 0
Oxygen,carbon,hydrogen
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Answer:

3.925 mol.

Explanation:

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<em>2 Na₂O₂(s) + 2 H₂O(l) → 4 NaOH(s) + O₂(g) ,</em>

It is clear that 2 moles of Na₂O₂ react with 2 moles of H₂O to produce 4 moles of NaOH and 1 mole of O₂ .

<em>Using cross multiplication:</em>

4 moles of NaOH produced with → 1 mole of O₂ .

15.7 moles of NaOH produced with → ??? mole of O₂ .

<em>∴ The no. of moles of O₂ made =</em> (1 mole)(15.7 mole)/(4 mole) =  <em>3.925 mol.</em>

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In the presence of an emulsifying agent, a mixture of oil and water becomes a _____.
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What happens to the mass of substances during a physical change?
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Here are the answers in order:

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4. During a chemical change the mass is changing colors. This is a representation of a chemical change.

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6. When the color of the substance has changed or when it explodes.

7. Reactants are the objects that react when in a chemical change.

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Chemical Reactions Part One Video:

1. mass

2. erupt-ant

3. reactant

4. object

5. mixtures

6. molecules

7. color changed

Questions again:

1. A chemical reaction

2. A physical change

3. Because if it is no higher than 46mg and no lower than 32mg then it will follow on it's own.

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