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ch 7 physicalscience
| Question | Answer |
|---|---|
| REACTANTS | substance that undergo change |
| PRODUCTS | the new substance formed as a result of that change |
| THE LAW OF CONSERVATION | mass states that mass is neither created nor destroyed in a chemical reaction |
| CHEMICAL EQUATION | is a representation of a chemical reaction in which that reactants and products are expressed as formulas |
| MASS IS CONSERVE | during a reaction a chemical equation must be balanced |
| COEFFICIENTS | the number that appears before the formula in a chemical equation to show the relative proportions of each reating product |
| CHEMICAL USE THIS COUNTING UNIT | chemical reactions often involve large numbers of small particles,the unit called mole to measure the amounts of a substance |
| MOLE | an amount of a substance that contains approximately particles of the substance |
| MOLAR MASS | the mass of one mole of a substance |
| THE MASS OF A REACTANT OR PRODUCT | chemical reactions can be calculated by using a balanced chemical equation and molar masses of the reactants and products |
| GENERAL TYPES OF CHEMICAL REACTIONS | synthesis reactions, decomposition reactions, single replacement reactions, double replacement reactions, and combustion reactions |
| SYNTHESIS REACTION | a chemical reaction in which two or more substance react to form a single substance |
| DECOMPOSITION REACTION | a chemical reaction in which a compound breaks down into two or more simpler susbstance |
| SINGLE REPLACEMENT REACTION | a chemical reaction in which one elements takes the place of another element im a compound |
| DOUBLE REPLACEMENT REACTIONS | a chemical reaction in whic two compound exchange positive ions and form two new compounds |
| COMBUSTION REACTIONS | a chemical reaction in which a substance reacts rapidly with oxygen often producing heat and light |
| DISCOVERY OF A SUBATOMIC PARTICKLE | enables scientists to classify certain chemical reactions as transfers of electrons between atoms |
| OXIDATION REDUTION REACTION | a chemical reactions in which electrons are tranferred from one reaction to a nother |
| CHEMICAL ENERGY | the energy store in chemical bonds |
| CHEMICAL REACTIONS INVOLVE | the breaking of chemical bonds in the products |
| DURING CHEMICAL REACTION | energy is either released or absorbed |
| EXOTHERMIC REACTION | a chemical reaction that releases energy to its sorrounding |
| ENDORMIC REACTION | a chemical reaction that absorbs energy from its surroundings |
| REACTION RATE | rates tell you how fast a reaction is going |
| FACTORS THAT EFFECT REATION RATES | includes temperature, surface area, concentration, stirring , and catalysts |
| CATALYST | a substance that effects the rate of a chemical reaction whitout being used up in the reaction |
| EQUILIBRIUM | a state in which the foward and reverse paths of a physical or chemical change take place at the same rate |
| WHEN PHYSICAL DOES NOT go to completion | equilibrium is established between the forward and reverse changes |
| WHEN A CHEMICAL DOES NOT go to completion | a equilibrium is established between the forward and reverse reactions |
| CHANGE INTRODUCED TO A SYSTEM EQUILIBRIUM | the equilibrum shifts in the direction that relieves the change |
Created by:
hispanic911
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