Thermodynamics Part 1

Temperature is a measure of the...

• total energy in a substance
• total kinetic energy in a substance
• average potential energy in a substance
• average kinetic energy of molecules in a substance

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The transfer of thermal energy between objects of different temperatures is called...

• temperature
• heat
• internal energy
• none of these

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A substance with a high specific heat:

• Is always extremely hot.
• Requires a lot of energy to become hot.
• Is not heavy.
• Does not requires a lot of energy to become hot.

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Thermal energy always moves:

• From a high temperature object to a lower temperature object.
• From a lower temperature object to a higher temperature object.
• From an object with lower kinetic energy to an object with higher kinetic energy.
• From an object of higher mass to an object of lower mass.

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The first law of thermodynamics states that energy is

• created
• destroyed
• conserved
• created and destroyed

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Select the correct SI unit for Heat

• calorie

• joule

• kilojoule

• kelvin

Select the correct symbol for Heat

• H

• t

• Q

• E

Define ΔH

• Change in Specific Heat; Heat by one Degree Celsius

• Change in Temperature; the energy we calculate; Degree Celsius

• Change in Enthalpy; the energy/heat we calculate

• Change in Time; time travel

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YOU HAVE TIME!

How much energy is needed to raise the temperature of a 20.0g piece of copper from 15.0 degrees Celsius to 25.0 degrees Celsius? (The specific heat of copper is 0.385 J/g C)

• 20 X (25-15) =70 J

• 20 X .385 X (25-15)= 77 J

• 20 X .385 X (15-25)= 62 J

• 20 X .385 X (15-0)= 77 J

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Is the reaction exothermic or endothermic?

H2 + S + O2 -> H2SO4 ΔH = -811.13kJ

• ΔH is negative so it is exothermic

• ΔH is positive so it is exothermic

• ΔH is positive so it is endothermic

• ΔH is negative so it is endothermic

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