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REY [17]
3 years ago
6

Are all physical reactions reversible?

Chemistry
1 answer:
ivann1987 [24]3 years ago
7 0
No not all. for example cutting down a tree is a physical reaction/change but it is not something you can redo.
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Which of the following describes a perpetual-motion machine?
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a motor that requires no energy input once it is running

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Describe the changes in properties (from metals to nonmetals or from nonmetals to metals) as we move (a) down a periodic group a
defon

Answer:

Explanation:

The changes in properties from metals to non-metals on a periodic table can be measured and determined by the metallicity or electropositivity of elements.

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a.

Down a periodic group, metallicity increases.

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1. Butane gas (C4H10) combusts with oxygen gas (O2) to form water (H2O) and carbon dioxide (CO2). Write a balanced;’ equation fo
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Answer:

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So, the balanced equation of combustion of butane is:

<em>2C₄H₁₀ + 13O₂ → 8CO₂ + 10H₂O.</em>

  • <em>It is clear that 2.0 moles of butane is burned in 13.0 moles of oxygen to produce 8.0 moles of CO₂ and 10.0 moles of H₂O.</em>
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A 57.9 g sample of glass is cooled by 2.70'C how much heat does it release

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