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Arte-miy333 [17]
3 years ago
6

Which of the following would most likely contain carbon?

Chemistry
2 answers:
irakobra [83]3 years ago
6 0
Trees ................
zalisa [80]3 years ago
6 0
Trees contain carbon. 

Answer: Trees
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Explanation:

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A 100.0 lb skier moves at 40.00miles/hour. Calc her kinetic energy.
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answer: its 7290 joules.

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hence x= 45 kg. let's convert 1 mile per hour = 0.45 metre per second we cross multiply by 40 mile per hour. x= 40 * 0.45= 18 m/s.

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lara [203]

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\no

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How much heat does it take to melt 5.0g solid copper?
Leya [2.2K]

Answer:

Q=1.04kJ

Explanation:

Hello,

In this case, for latent heat (phase change) we need to consider the enthalpy associated with the involved process, here, melting or fusion; thus, the enthalpy of fusion of copper is 13.2 kJ/mol, therefore, the heat is computed as:

Q=m\Delta H_{fus}

Nevertheless, since the given enthalpy is per mole of copper, we need to use its atomic mass to perform the correct calculation as follows:

Q=5.0g*\frac{1mol}{63.54}* 13.2\frac{kJ}{mol}\\ \\Q=1.04kJ

Which is positive as it needs to be supplied to the system.

Best regards.

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3 years ago
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