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24 Cards in this Set

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