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Ivan
3 years ago
13

Which of the following is an example of a chemical change? Dissolving sugar in coffee Evaporating rubbing alcohol Freezing water

Rusting iron
Chemistry
2 answers:
Pavel [41]3 years ago
8 0

Answer:

The answer is Rusting iron

Sholpan [36]3 years ago
3 0

Rusting iron is an example of a chemical change because iron reacts with air when moisture is present.

examples of chemical changes are:

• Molecules rearrange with other molecules to make new substance

• Can be production of flames

• Color change

• Bubbling/fizzing

• Temp. change

Examples of physical changes are:

• Melting

• Boiling

• Freezing

• Condensing

• Breaking

• Bending

• Dissolving


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How is burning magnesium different than burning methane
olya-2409 [2.1K]

You can stop the burning of methane with water or carbon dioxide extinguishers but problems arise when you try to use this to stop the burning of the magnesium.

Explanation:

To burn magnesium (Mg) and methane (CH₄) you need to react them with oxygen:

2 Mg (s) + O₂ (g) → 2 MgO + heat

CH₄ (g) + 2  O₂ (g) → CO₂ (g) + 2 H₂O (g) + heat

However at that temperatures magnesium (Mg) is able to react with water (H₂O) and carbon dioxide (CO₂).

Mg (s) + 2 H₂O (l) → Mg(OH)₂ (s) + H₂ (g)

2 Mg (s) + CO₂ (g) → 2 MgO (s) + C (s)

So the safe option to stop the burning of the magnesium is to limit the oxygen in the air.

we have used the following notations:

(s) - solid

(g) - gas

(l) - liquid

Learn more about:

combustion reactions

brainly.com/question/13824679

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3 years ago
Ca+Cl2--&gt;CaCl2 Then, write balanced half-reactions describing the oxidation and reduction that happen in this reaction.
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Answer:

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Reduction half

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Explanation:

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