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Svetradugi [14.3K]
2 years ago
8

Does seeing a gas produced always mean a chemical reaction is occurring? Explain.

Chemistry
2 answers:
chubhunter [2.5K]2 years ago
4 0
Seeing signs of a chemical reaction does not always mean that a reaction is happening. For example, a gas (water vapor) is given off when water boils. ... You can tell that it is a physical change because water vapor can condense to form liquid water. In a chemical change, a new substance must be produced.
Alex17521 [72]2 years ago
4 0

Answer:

Explanation:

yes

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For answering for the question, there exists four choices:
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reduction half-reaction general formula is 
oxidant + e - or +  -------- Product

so in our case the answer is 
1) Na+  +  e- -------------- Na (exactly balanced)

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