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Stack #174719
Chemical Reactions Review
Question | Answer |
---|---|
Chemical Reactions | the process by which chemical changes occur (atoms are rearranged and chemical bonds are broken and formed) |
Chemical Change | a change of one substance into another substance (molecular level) |
Physical Change | a change of one substance (states of matter or energy) |
Reactants | substances present at the beginning of the chemical reaction |
Products | substances formed by a chemical reaction (end) |
Law of Conservation of Mass | in a chemical reaction atoms are neither created nor destroyed (all atoms present in the reactants are present in the products) |
Bond Energy | energy associated with bonds |
Exothermic Reactions | reaction in which energy is released |
Endothermic Reactions | reaction in which energy is absorbed |
Evidence of chemical reactions: | •Color change•Formation of a precipitate (solid product)•Formation of a gas•Temperature change |
Rates of chemical reactions can vary based on: | •Concentration•Surface area•Temperature |