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8 Cards in this Set
- Front
- Back
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physical change
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A physical change is any change NOT involving a change in the substance's chemical identity. Here are some examples: (1) any phase change. Moving between solid, liquid and gas involves only the amount of energy in the sample (this amount is the subject of future lessons).
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• chemical change
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Chemical change is any change that results in the formation of newchemical substances. At the molecular level, chemical change involves making or breaking of bonds between atoms. These changes are chemical: iron rusting (iron oxide forms)
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• law of conservation of mass
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Antoine Lavoisier stated that "The law of conservation of mass meansthat the atoms of an object cannot be created or destroyed, but can be moved around and be changed into different particles."
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energy •
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the strength and vitality required for sustained physical or mental activity.
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temperature
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the degree or intensity of heat present in a substance or object, especially as expressed according to a comparative scale and shown by a thermometer or perceived by touch
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thermal energy
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Thermal energy is the internal energy of an object due to the kineticenergy of its atoms and/or molecules. The atoms and/or molecules of a hotter object have greater kinetic energy than those of a colder one, in the form of vibrational, rotational, or, in the case of a gas, translational motion.
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endothermic change
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The definition of endothermic is a chemical reaction that is accompanied by the absorption of heat, or an organism that generates heat to maintain its temperature. A chemical reaction that works only if heat is absorbed is an example of a reaction that would be described asendothermic.
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exothermic change
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The definition of exothermic is a process or chemical reaction characterized by or causing the liberation or release of heat. Combustion where heat is released is an example of an exothermic reaction.
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