Physical Science Final: Chemical Reactions
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24 terms
Terms | Definitions |
|---|---|
 Chemical Reaction | A process in which the physical and chemical properties of substances change as new substances with different physical and chemical properties are formed |
| Reactant | A substance that enters a chemical reactions |
| Product | A substance that is produced in a chemical reaction |
| Atoms | When you write a formula for a covalent compound, you are showing how many (blank) of each element can be found in a molecule of the compound |
| Law of Conservation of Mass | The (blank) says the mass must stay constant in a chemical reaction |
| Mass | (blank) remains constant in a chemical reaction |
| Sythesis | Two or more substances combine to form one new substance; Combination |
| Decomposition | A complex substance breaks down into two or more simpler substances |
| Single Replacement | An uncombined element replaces an element that is part of a compound |
| Double Replacement | Different atoms in different compounds replace each other |
| Combustion | The reaction of oxygen with a compound containing Hydrogen and Carbon (a hydrocarbon); energy is released as heat and light |
| Activation Energy | The energy needed to start a chemical reaction |
| Exothermic | A reaction in which energy is released. It is caused when the reactants have more energy than the products |
| Endothermic | A reaction in which energy is absorbed. It is caused when the products have more energy than the reactants. |
| Reaction Rate | How fast a chemical reaction takes place |
| Collision Theory | States that a chemical reaction happens when particles collide at the correct angle and with enough energy. It relates particle collisions with reaction rates |
| Factors that affect Reaction Rate | Temperature, Surface Area, Concentration, Catalysts |
| Temperature | Amount of energy in a substance |
| Temperature | A higher (blank) makes the particles move faster |
| Surface Area | How many particles are on the surface of a substance |
| Concentration | How much of a substance is in a certain volume |
| Catalyst | A substance which changes the rate of a reaction |
| Catalyst | A (blank) is not changed in a reaction |
| Evidence of Chemical Change | Color changes, heat content changes, a gas is produced, a precipitate forms |
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