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24 Cards in this Set
- Front
- Back
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Why is it incorrect to balance a chemical equation by changing the subscript?
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change the subscripts changes the actual compound itself
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Large, bulky molecules react more slowly than small ones because they have less opportunity to
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collide with other molecules
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In the reaction 2H2O--> 2H2+O2, if you start with 2 mol of water, how many moles of hydrogen gas are produced?
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2 mol
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When methane reacts with abundant amounts of oxygen, the products are
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carbondioxide and water
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Fragments of molecules that have at least one electron available for bonding are called
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radicals
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A chemical equation is balanced by changing or adding
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coefficients
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When you break bonds you
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need energy
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An enzyme is a special kind of catalyst that works to
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speed up biological chemical reactions
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A change in color, such as rusting of metal is a sign that
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a chemical change is taking place
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Is the reaction exothermic or endothermic?
AX+BY+heat-->AY+BX |
endothermic
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What happens in a chemical reaction
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atoms are rearranged
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All of the following factors may speed up a chemical reaction except
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higher pressure
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In a redox reaction, the substance that accepts electrons is said to be
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reduced
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Large molecules react slower than small ones
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a
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Because of this Zinc dust can explode but large pieces of zinc will not
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surface area
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Francium is very reactive because of its valence electrons
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nature of reactants
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A cup of hydorchloric acid is more reactive than a cup of water with one drop of hydrochloric acid
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concentration
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Raising this causes more collisions between molecules
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temperature
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Biological ones are called enzymes
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catalysts
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CH4+O2-->H2O +CO2
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combustion
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AX+BY-->AY+BX
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Double-replacement
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CO2-->C+O2
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decomposition
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A+B--> AB
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a
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Mg+AuO-->MgO+AU
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single-replacement
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