chpt 17
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| Enthalpy reaction | the quantity of energy transferred as heat during a chemical reaction.
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| enthalpy formation | enthalpy change that occurs when one mole of a compound is formed from its elements in their standard state at 25 degrees and 1 atm.
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| enthalpy combustion | the energy released as heat by the complete combustion of a specific amount of a substance at a constant pressure or constant volume.
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| entropy | measure of the randomness or disorder of a system
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| entropy decrease | decrease is when the particles are at low random, Ex freezing water you are converting it froma liquid to a solid so therefore forcing the particles to be more at random.
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| entropy increase | EX. paper burning its more at random so therefore an increase in entropy because you are converting the solid paper to another state of matter.
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| thermochemical equations | 2h2+o2-->2h2o+483.6KJ of energy
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| free energy change | delta G, a system that is defined as the difference between the change in enthalpy, delta H, and the product of the kelvin temperature and the entropy change(t Delta s)
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| free energy equation | delta (G)=HR-T(delta S)
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| Reaction 1 | if T and S are both positive the reaction will only occur IF it is at high temperature and the sum is great then HR.
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| Reaction 2 | HR (+) and S (-) and If (G) is positive the reaction will never occur! but if (G) is negative the reaction will occur.
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| Reaction 3 | HR (-) delta S (-) reaction can still take place.
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| Heat of FOrmation | H2+ .5o2-->H2o +241.8 KJ the amount of energy changes that occur when a compound is freed from its elements is an indication that formed when it is a compound. The more energy thats given off when its formed the more stable the compound.
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| hess's Law | the overall enthalpy change in a reaction is equal to the sum of enthalpy changes for the individual steps in the process.
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Review the information in the table. When you are ready to quiz yourself you can hide individual columns or the entire table. Then you can click on the empty cells to reveal the answer. Try to recall what will be displayed before clicking the empty cell.
To hide a column, click on the column name.
To hide the entire table, click on the "Hide All" button.
You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
To hide a column, click on the column name.
To hide the entire table, click on the "Hide All" button.
You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
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