Term
| The number that describes how many molecules of a substance are involved in a chemical reaction is a subscript. |
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Definition
| False. Coefficient. Subscripts describe how many atoms of an element are involved in a reaction. |
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Term
| A substance that enters into a chemical reaction is called a reactant. |
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Definition
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Term
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Definition
| AgNO3 + NaCl -- > AgCl + NaNO3 is a single replacement reaction. False. Double replacement. |
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Term
| A chemical reaction in which an uncombined element replaces an element that is part of a compound is called a Double replacement reaction. |
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Definition
| False. Single replacement reaction. AN UNCOMBINED ELEMENT REPLACES AN ELEMENT. If it were stated as a chemical reaction in which uncombined elements replace each other then it would be a double replacement reaction. |
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Term
| An increase in temperature results in an increase in the rate of a chemical reaction. |
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Definition
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Term
| In the reaction AgNO3 + NaCl -- > AgCl + NaNO3 , the substances AgCl and NaNO3 are products. |
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Definition
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Term
| Chemical bonds form only when electrons are shared. They cannot form when electrons are gained or lost. |
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Definition
| False. Chemical bonds form when electrons are shared, lost, or gained. |
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Term
| A chemical equation is one in which symbols and formulas are used to represent a chemical reaction. |
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Definition
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Term
| An exothermic reaction occurs when two substances are chemically combined and energy is absorbed. |
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Definition
| False. Energy is released in exothermic reactions. Energy is absorbed in Endothermic reactions. |
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Term
| In the formula 3AgNO3 There are ___ Ag atoms, ___N atoms, and ___O atoms. |
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Definition
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Term
| The energy needed for reactants to form products is __________________. |
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Definition
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Term
| An increase in the surface area of reactants will cause an ________________ in the rate of chemical reaction. |
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Definition
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Term
| A chemical reaction in which energy is absorbed is called an _____________________ reaction. |
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Definition
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Term
| In the ________________ theory, reacting molecules must hit each other with sufficient energy in order to form products. |
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Definition
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Term
| _________________ is when a substance breaks down into two or more simpler substances. |
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Definition
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Term
| A _________________ is when two or more substances combine to form a new, more complex substance. |
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Definition
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Term
| A(An) ____________________ in the rate of reaction results from an increase in the concentration of reactants |
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Definition
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Term
| _______________ is the study of reaction rates. |
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Definition
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Term
| In a chemical equation, (1)__________________ are written to the right of the arrow, and (2)__________________ are written to the left of the arrow. |
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Definition
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Term
| ____________________ increase the rate of reaction without being changed by the reaction. |
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Definition
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Term
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Definition
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Term
| AgNO3 + NaCl -- > AgCl + NaNO3 |
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Definition
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Term
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Definition
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Term
| Zn + 2HCl -- > ZnCl2 + H2 |
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Definition
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Term
| Al2(SO4)3 + CaCl2 -- > AlCl3 + CaSO4 |
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Definition
| Al2(SO4)3 + 3CaCl2 -- > 2AlCl3 + 3 CaSO4. You have one SO4 on the right and 3 on the left, so put a 3 in front of Ca SO4. You then have 3 Ca atoms on the right so put a 3 in front of CaCl2 on the left. Then, you have 6 Cl and 2 Al on the left so you need to put a 2 in front of AlCl3 on the right. All elements must have the same number atoms on the right and on the left. Conservation of mass. |
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Term
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Definition
| Check the number of atoms of each element on the left and on the right. CCl4+O2 -- > CO2 + 2Cl2 |
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Term
| A _________ change involves a chemical change in a substance, the creation of a new substance. |
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Definition
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Term
| A _________ change occurs when the form or appearance of a substance changes, but the substance does not chemically change. |
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Definition
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Term
| How does collision theory relate to an increase in reaction rate caused by an increase in temperature? |
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Definition
| The number of collisions that occur between atoms increases as a result of an increase in temperature. This increases the rate of reaction because there are more opportunities for the atoms to hit each other in the correct orientation. |
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Term
| What are the steps involved in balancing a chemical equation? |
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Definition
| 1)Write the equation out with the correct symbols and formulas 2)Count the number of atoms per element on each side of the arrow 3)Balance using coefficients. 4)Check by recounting the number of atoms per elements |
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Term
| A balanced equation provides two pieces of information: |
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Definition
| The elements and the number of atoms involved AND the type of reaction (synthesis, decomposition, single/double replacement) |
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