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how do conduction and convection differ?
a. conduction can move through empty space to transfer heat; convection cannot.
b. conduction does not require objects to have direct physical contact; convection does.
c. conduction requires objects to have direct physical contact; convection does not.
d. conduction transmits heat through electromagnetic waves; convection does not.

C. Conduction requires objects to have direct physical contact; convection does not.

Explanation:
Conduction is used in cooking. You have to put the pot on the burner to cook the food. Otherwise, the air will cool it and the food will not cook because it's not getting the pot hot.
Convection moves heat through electromagnetic waves, kinda like the sun warming the Earth.

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C. conduction requires objects to have direct physical...

Spontaneity tell us the direction of the reaction, but not how fast it goes. gibbs free energy brings together enthalpy, entropy and temperature in one easy formula. g = h - ts. and, finally the sign of delta g is always negative for a spontaneous reaction.

Ibelieve y y even though i've only taken chemistry for one year