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In which of these samples do the atoms have the greatest kinetic energy? (3 points)


liquid iron (2,000°C)

liquid iron (1,600°C)

solid iron (65°C)

solid iron (25°C)

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Answer is: atoms have the greatest kinetic energy in liquid iron (2,000°C).
The average kinetic energy of molecules depends on the temperature. 
At high temperature(2,000°C), molecules of iron have greater kinetic energy than molecules of iron at low temperature (1,600°C, 65°C and 25°C)..

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