Adv Science: Chapter 21
About this set
Created by:
ljoh15 on February 13, 2011
Classes:
HIES Study Help, Hies Exam Help, HIES 8th 2011, Hies Study for Exams!!, Advanced Classes group, 9th GRADE!! HAPPY STUDYING!!
Log in to favorite or report as inappropriate.
Order by
25 terms
Terms | Definitions |
|---|---|
 Chemical Reaction | a change in which one or more substances are converted into new substances |
| Reactants | the substances that react in a chemical equation |
| Products | the new substances produced in a chemical reaction |
| The Law of Conservation of Mass | Matter is neither created nor destroyed during a chemical reaction. Mass of products=mass of reactants |
| Chemical Equation | A way to describe a chemical reaction using chemical formulas and other symbols. |
| Gas | (g) |
| Liquid | (l) |
| Solid | (s) |
| Aqueous | (aq) dissolved in water |
| Coefficients | Represents the number of units of each substance taking part in the reaction |
| Balancing Equations | - Write a chemical equation using formulas, symbols and abbreviations - Check the equation to see if #s of atoms balance - Choose coefficients that balance - recheck numbers |
| Diatomic Molecules | Most halogens and gas elements such as hydrogen & oxygen exist in nature as these. This is more stable than existing as individual atoms. |
| Types of Chemical Reactions | 1. Combustion 2. Synthesis 3. Decomposition 4. Single Displacement 5. Double Displacement |
| Combustion Reactions | Occur when a substance reacts with oxygen to produce energy in forms of heat and light |
| Synthesis Reactions | 2 or more substances react to form another substance |
| Decomposition Reactions | 1 substance breaks down into 2 or more substances |
| Single Displacement | Occurs when 1 element replaces another in a compound |
| Double Displacement | Occurs when a positive ion of one compound replaces the positive ion of the other to form new compounds |
| Precipitate | An insoluble compound that comes out of solution |
| Exergonic | A chemical reaction accompanied by the release of energy |
| Exothermic | A chemical reaction accompanied by the release of heat |
| Endergonic | A chemical reaction accompanied by the absorption of energy |
| Endothermic | A chemical reaction accompanied by the absorption of heat |
| Catalyst | a substance that increases the rate of a chemical reaction without itself undergoing any permanent chemical change |
| Inhibitor | a substance that slows down or prevents a particular chemical reaction or other process |
First Time Here?
Welcome to Quizlet, a fun, free place to study. Try these flashcards, find others to study, or make your own.