Chapter 8: Chemical Equations and Reactions
Study Guide
✅
Chemical Reaction- A _____________ __________ is the process by
which one or more substances are changed into one or more different
substances
✅
Reactants, Products- The original substances in a chemical equation are
known as the ______________ and the resulting substances are known as
the ______________
✅
Law of Conservation of Mass- According to the ___ __
_______________ __ _____, the total mass of reactants must be equal the
total mass of products for any given chemical equation
✅
Chemical Equation- A ________________ ____________ represents,
with symbols and formulas, the identities and relative molecular or molar
amounts of the reactants and products in a chemical reaction
✅
Identity- Evidence that one or more substances have undergone a
change in __________ are required to know that a chemical reaction has
taken place
✅
Heat, Light- Evolution of energy as ______ and _________ could
indicate that a chemical reaction has taken place. A change in matter that
releases both indicates this, but by themselves it might not be a chemical
change.
✅
Color, Gas, Precipitate- The following observations may indicate a
chemical reaction: release of both heat and light, change in ________,
production of a ____, formation of a ______________
✅
Precipitate- A solid that is produced as a result of a chemical reaction in
a solution that separates from the solution is known as a ______________
, ✅The diatomic elements
Br I N Cl H O F-
Law of Conservation of Mass-✅Atoms are neither created nor destroyed
so the same number of atoms of each element must appear on each side
of a correct chemical equation
✅
Coefficient- A _____________ is a small whole number that appears in
front of a formula in a chemical reaction. You add these to balance
numbers of atoms
✅
Word Equation- An equation in which the reactants and products in a
chemical reaction are represented by words
✅The arrow in a chemical equation is read as _______
Yield-
Formula Equation-✅A ___________ ___________ represents the
reactants and products of a chemical reaction by their symbols or formulas
✅
Qualitative- Word equations and formula equations are
_________________ statements that give no information about the
amounts of reactants or products
✅
Identity- Changing the subscripts of a chemical formula changes the
__________ of the compound
✅
Upward, Downward- Sometimes a gaseous product is indicated by an
arrow pointing __________. A __________ arrow is often used to show the
formation of a precipitate
✅
Lower- Many reactions are speeded up and can take place at ________
temperatures in the presence of a catalyst
✅
Catalyst- A ___________ is a substance that changes the rate of a
chemical reaction but can be recovered unchanged
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