Chemical Reactions Answers – Flashcards
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| What is a Chemical Reaction? |
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| Process which matter combines or breaks a part to form new kinds of matter with different properties. |
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| What is kinetic energy? |
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| Energy of motion |
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| What is potential energy? |
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| energy stored in an object because of its position relative to others |
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| What is the Law of Conservation of matter? |
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| energy is neither created or destroyed, just changes form |
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| What is a hydrocarbon? |
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| A compound that contains only hydrogen and carbon atoms. |
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| What is a chemical equation? |
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| a symbollic method of representing a reaction |
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| What is an exothermic reaction? |
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| It releases energy |
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| What is an endothermic reaction? |
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| It absorbs energy |
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| what is the law of conservation of mass? |
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| Mass is neither created nor destroyed |
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| What is a precipitate? |
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| insoluble solutions formed through a chemical reaction in a solution. |
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| What is a product? |
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| substance formed as a result of a chemical reaction. |
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| What is a reactant? |
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| Substance that is a starting material before a chemical change. |
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| What is the activity series? |
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| List of elements in which each will replace all below it but not above. |
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| The number of _________ you have at the start must = the number of ________ at the end. |
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| atoms. |
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| What is energy? |
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| The ability to cause a change in matter. |
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| H2, N2, Cl2,I2, O2, F2, and Br2 are all examples of what? |
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| Diatomic molecules |
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| What is a Combustion reaction? |
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| an exothermic reaction in which heat is released and a substance combines with OXYGEN forming products in which all elements are combined with ocygen. |
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| Combustion reactions are cpmmonly called________ |
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| Burning |
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| What is the general equation for Combustion? |
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CxHy+O2 ---> CO2+H2O
The x and y are variables and change depending on the hydrocarbon. Other substances such as wood, charcoal, paper, sugar, iron, and magnesium will burn with oxygen. |
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| What is a Synthesis Reaction? |
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| In a synthesis reaction, the reactants are all elements which combine to form a compound. It takes two substances to form one compound. |
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| What is the general equation for a synthesis reaction? |
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A+B--->AB
You can use the general formula to predict what the product might be if two elements were meant to react. If the charge of an element varies, predict both possibilities. |
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| What is Decomposition? |
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| A compound breaks down to form 2 or more substances |
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| What is the general equation for decomposition? |
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| AB--->A + B |
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| What is Dissociation? |
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| It is where an ionic compound breaks apart into its compound ions when dissolved. |
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| Most decomposition reactions are _____________ |
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Endothermic
(require energy) |
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| Dissociation is all about ________'s charges. |
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| ion |
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| What is a simple replacement reaction? |
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One element takes place of another element as a part of a compound ; *subscripts not carried over |
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| What is the general equation for single replacement? |
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A+BC---> BA+C
*Metals replace Metals. Nonmetals replace Nonmetals. |
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| Replacement reactions are ___________ |
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| Nonreversible |
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| What is a double replacement reaction? |
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| The positive metal ion combines with the negative of the other and vice versa |
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| What is the general equation for Double replacement reactions? |
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| AB+XY--->AY+XB |
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| If both products are soluble the reaction will or will not happen? |
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| will not |
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| In double replacement reactions, you must look at the chart to see if_________ |
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| The products are soluble or nonsuluble |
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| What are chemical changes influenced by? |
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| Temperature, Pressure, physical state and other conditions. |
