7. If an ice cube melts at OC but water also freezes at OC, what is the differen

Question

7. If an ice cube melts at OC but water also freezes at OC, what is the difference between melting freezing in terms of (a) the energy involved in the phase changes and (b) particles of the substances during the phase changes? For questions #8-9 use the following pictures: A. C. 8. Which picture(s) would best represent atoms in the gas of a neon sign? Explain why 9. Which picture(s) would best represent a rock? Explain why 10. If measurements of a gas are 75L and 300 kilopascals and then the gas is measured a second time and found to be S0L, describe what had to ha ppen to the pressure (if temperature remained constant). Include which law supports this observation.

Explanation / Answer

7)Melting - Energy is required by the particles and molecules change state from solid to liquid

Freezing- Energy released in this process and molecules change state from liquid to solid

8) Gas has large intermolecular distances. So diagram b) represent a gas.

9) Solid moleules are closely packed and have short intermolecular distances.So, diagram c) reresent a rock.

10)Pressure increases as the volume increases. Its pressure must have increase as the volume is droping from 75l to 50l. This is supported by Boyle's law which states that volume and pressure have inverse relationship at constant temerature.

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