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Topic 5:Energy; C

Heat Energy & Changes of State; pgs. (90 - 93).

QuestionAnswer
List the three physical phase states of matter found upon Earth. Solid , Liquid , & Gas.
What phase change occurs during melting? Solid to liquid. Energy is absorbed.
Describe the phase change of freezing. Liquid to solid. Energy is released.
Describe the phase change of vaporizing, or evaporation. Liquid to gas. Energy is absorbed.
Explain the phase state transformation called condensation. Gas to liquid. Energy is released.
Does temperature change during phase change? No! All energy is used to change the phase state.
Organize the 3 physical phase states from highest to lowest energy. Gas, liquid, to solid.
If there is no change in phase state and energy is added, what changes? The temperature of the substance rises.
At what temperature will H2O freeze or melt? 0 degrees Celsius, or 32 degrees Fahrenheit.
At what temperature will H2O vaporize or condense? 100 degrees Celsius, or 212 degrees Fahrenheit.
What page in the ESRT contains the Temperature Conversion Chart? Page 13.
What page in the ESRT contains the Specific Heat Chart? Page 1.
Why is water harder to heat and cool than lead? Water has high specific heat at 4.18 j/gC; Lead low at 0.13 j/gC.
How much energy is required to melt 5 grams of ice to form 5 grams of water at zero degrees Celsius. 5 grams X 334 j/gC = 1670 Joules
How much energy is released when 2 grams of vapor condenses to form 2 grams of water at 100 degrees Celsius? 2 grams X 2260 j/gC = 4520 Joules
Define nuclear decay. The break down of unstable atoms to stable matter with a release of energy in the form of heat.
Can you compute a rate of change problem? At 2.5 minutes the temp was O degrees Celsius. At 4.5 minutes, the temperature was 100 degrees Celsius. 100 - 0 = 100 degrees / two minutes = 50 degrees/min.
Why does a wet towel feel cooler than a dry towel when both are in the sunshine? Evaporating water absorbs energy creating lower temperature in the surrounding air. The energy is used to raise temperature in the dry towel.
Describe conduction. Process of energy transfer through a solid material.
Explain convection. Process of energy transfer through a liquid or gas due to density differences.
Define radiation. How light travels through space, or anywhere.
Created by: whearn
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