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olasank [31]
4 years ago
12

Sharping a pencil leaves behind pencil shavings. Is sharpening pencil a physical or chemical change

Chemistry
1 answer:
Deffense [45]4 years ago
6 0
Physical, since you are physically changing its appearance
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How much energy (in J) is lost when a sample of iron with a mass of 26.4 g cools from 74.0 ∘C to 26.0 ∘C?
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Answer:

Q=-526.6J

Explanation:

Hello,

In this case, for the computation of the energy loss when the cooling process is carried out, we use the shown below equation:

Q=mCp\Delta T

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Q=26.4g*0.444\frac{J}{g\°C}*(26.0\°C-74.0\°C)\\ \\Q=-526.6J

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What do melting, evaporation, and sublimation have in common?
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Explanation:

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