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25 Cards in this Set
- Front
- Back
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What is a chemical reaction?
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A process where the physical and chemical properties of the original substances change as new substances with different physical and chemical properties are formed.
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Chemical Reaction characteristics
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1. Chemical reactions always result in the formation of a new substance.
2. they always involve a change in energy. |
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Reactant
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A substance that enters into a chemical reaction
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Product
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A substance that is produced by a chemical reaction.
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The relationship between the arrangement of electrons in an atom and its chemical properties are:
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it determines the atom's bonding capacity-or how easily it can bond with other atoms (depends on how full outermost energy level is)
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Law of conservation of mass
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is the observaton that mass remains constant in a chemical reaction i
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How are chemical equations balanced? Why must they be balanced?
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??
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What is a chemical equation
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symbols and formulas used to describe a chemical reaction.
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Can you change symbols, formulas or subscripts to balance a chemical equation?
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No, because
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Name the four types of reactions
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1. synthesis
2. decomposition 3. single replacement 4. double replacement |
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What is the difference between a synthesis reaction and a decomposition reaction?
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The difference is that synthesis reaction combines two simple substances to make a complex one while decomposition reactions break down a complex substance into its parts. S: A + B --> C
D: C --> A + B |
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A single replacement reaction
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when an uncombined element replaces an element that is part of a compound.
A+B---> AX +B |
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A double replacement reaction is
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when two compounds react to form two new compounds.
AX + BY --->AY + BX |
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How are chemical reactions classified according to energy changes?
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???
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An exothermic reaction
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is
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An endothermic reaction
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is
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On which side should the energy term be written in an equation represenitng an endothermic reaction?
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??
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Which side in an exothermic reaction?
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Compare the energy content of reactant and products in an exothermic reaction.
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???
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Compare the energy content of reactants and products in an endothermic reaction.
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???
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How is the collision theory related to the factors affecting reaction rate?
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???
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What is reaction rate?
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???
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How is the reaction rated related to collision theory?
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???????
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Name four factors that affect reaction rate.
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1.
2. 3. 4. |
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How does collision theory explain the effect of a decrease in temperature on the reaction rate?
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????
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