DCE Chemistry Unit 8 Vocabulary
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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| intermolecular forces | forces of attraction between molecules that affect how a substance behaves(weaker than ionic and covalent bonds)
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| enthalpy | the heat content of a system at constant pressure
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| entropy | a measure of the disorder in a system
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| kinetic energy | the energy an object has because of its motion
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| temperature | a measure of the average kinetic energy of the particles in a substance
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| spontaneous reaction | a reaction will likely occur on its own if it can achieve a decrease in energy and and increase in disorder
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| exothermic | a reaction that releases heat into the surroundings
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| endothermic | a reaction that absorbs heat from the surroundings
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| dipole-dipole force | the attraction of the positive end of a polar molecule to the negative end of a neighboring polar molecule
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| solid | particles in the sample have an orderly arrangement and move only in place
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| liquid | particles in the sample are loosely packed together and can move past each other
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| gas | particles in the sample are separated from each other by a great amount of open space
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| melting | the process by which a solid becomes a liquid
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| enthalpy (heat) of fusion | the amount of energy needed to melt a substance
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| enthalpy (heat) of vaporization | the amount of energy needed to evaporate a substance
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| freezing | the process by which a liquid becomes a solid
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| vaporization/evaporation | the process by which a liquid becomes a gas
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| condensation | the process by which a gas becomes a liquid
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| sublimation | the process by which a solid becomes a gas
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| deposition | the process by which a gas becomes a solid
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| heat capacity | the amount of heat needed to increase the temperature of a substance one degree Celsius
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| specific heat | the amount of heat needed to increase the temperature of a one gram of a substance one degree Celsius
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| heat of reaction | the change in enthalpy for the reaction as written (delta H)
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| dipole | a molecule that has a region of negative charge and a region of positive charge
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| dispersion forces | attraction between non polar molecules caused by the movement of electrons creating momentary dipoles
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| hydrogen bonds | the strongest intermolecular force in which a hydrogen atom is attracted to a fluorine, oxygen, or nitrogen atom
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| surface tension | the tendency of a surface of a liquid to resist an external force
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| viscosity | resistance to flow
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| adhesion | when different molecules are attracted to one another due to intermolecular forces
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| cohesion | when molecules of the same type are attracted to one another due to intermolecular forces
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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.
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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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