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Ch. 8 Reactions
| Definition | Term |
|---|---|
| A substance that enters into a chemical reaction . Always on the left side of the arrow. | reactant |
| A substance that is produced by a chemical reaction. Always on the right side of the arrow. | product |
| Expression in which symbols, formulas, and numbers are used to represent a chemical reaction. | chemical equation |
| The observation that mass remains constant in a chemical reaction. | law of conservation of mass |
| Two or more simple substances combine to form a new complex substance. | synthesis reaction |
| A complex substance breaks down into two or more simpler substances. | decomposition reaction |
| An uncombined element replaces an element that is part of a compound. | single replacement reaction |
| Different atoms in two different compounds replace each other. | double replacement reaction |
| A chemical reaction in which energy is released. | exothermic |
| A chemical reaction in which energy is absorbed. | endothermic |
| Energy required to start a reaction. | activation energy |
| The study of reaction rates. | kinetics |
| Measure of how quickly reactants turn in products. | reaction rate |
| Relates collisions among particles to reaction rate. Reaction rate depends on such factors as concentration, surface area, temperature, and catalysts. | collision theory |
| Refers to how much of the material is exposed | surface area |
| Increases the rate of a reaction, but does not change itself. | catalyst |
| The number placed in front of the symbol or formula in a chemical equation that indicates the number of atoms or molecules involved in the reaction. This is used to balance an equation. | coefficient |
| Number placed in the lower right of the chemical symbol to indicate the number of atoms of the element in the compound. | subscript |
| Combining of atoms and electrons to form new substances. This happens when electrons are gained, lost, or shared. | chemical Bond |
| Process in which substances undergo physical and chemical changes that result in a new substance with different properties. | chemical reaction |
| Gas that reignites | oxygen |
| Gas that makes a popping noise when a flame is held near it | hydrogen |
| Range of the ph scale | 0-14 |
| Neutral number on the ph scale | 7 |
| 0-6 on the ph scale | acid |
| 8-14 on the ph scale | base |
| Range when phenolphthalein turns pink | 8-10 |
| Variable in Ammonium Nitrate lab | NaCl |
| Example of an indicator we have used | phenolphthalein |
| Example of an acid we used | hydrochloric |
| Example of a base we used | sodium hydroxide |
| If red litmus paper turns blue, then the solution is a | base |
| If blue litmus paper turns red, then the solution is an | acid |
Created by:
tthomps
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