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3 years ago

Explain your reasoning to why the rusting of iron is a chemical change (evidence not needed but may add it)

Chemistry

2 answers:

nika2105 [10]3 years ago

8 0

Answer:

A chemical change is when a new substance forms, which aligns with the rusting of iron since the iron is producing a different kind of matter

Tju [1.3M]3 years ago

7 0

When an iron object is left in damp air for a considerable time, it gets covered with a reddish- brown flaky substance called rust. ... Rusting of iron is a chemical change because a new substance iron oxide is formed. The presence of oxygen and water or water vapour is essential for rusting.

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3 years ago

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3 years ago

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3 years ago

2. Calculate the number-average molecular weight of a random poly (isobutylene-isoprene) copolymer in which the fraction of isob

Phoenix [80]

Answer : The number-average molecular weight is, 97500 g/mol

Explanation :

First we have to calculate the molecular weight of isobutylene and isoprene.

The molecular formula of isobutylene and isoprene is, $C_4H_8$ and $C_5H_8$

Molecular weight of $C_4H_8$ = 4(12 g//mol) + 8(1 g/mol) = 56 g/mol

Molecular weight of $C_5H_8$ = 5(12 g//mol) + 8(1 g/mol) = 68 g/mol

Now we have to calculate the average repeat molecular weight.

Average repeat molecular weight = $0.25\times (56g/mol)+(1-0.25)\times (68g/mol)$

Average repeat molecular weight = 65 g/mol

Now we have to calculate the number-average molecular weight.

Number-average molecular weight = Average repeat molecular weight × Degree of polymerization

Number-average molecular weight = (65 g/mol) × (1500)

Number-average molecular weight = 97500 g/mol

Thus, the number-average molecular weight is, 97500 g/mol

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3 years ago

Balancing chemical equation <br> Fe + 02 - Fe203

denpristay [2]

Answer:

4 Fe + 6 02 ----> 2 Fe2O3

Explanation:

you need 4 iron and 6 oxygen in each side

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3 years ago

Explain your reasoning to why the rusting of iron is a chemical change (evidence not needed but may add it) ​

Explain your reasoning to why the rusting of iron is a chemical change (evidence not needed but may add it)