Types of Reactions
Na + Cl = NaCl
Synthesis
True or False: Exothermic Reactions require no activation energy.
False
True or False: When a chemical reaction has the same number of atoms on each side, it is balanced.
True or False: All chemical reactions occur at the same rate?
False
True or False: According the Law of Conservation of Mass, 3 atoms of calcium can react to produce 6 atoms of calcium.
False.
NaCl + HO2 = NaO2 + HCl
Double Replacement
_____________ is the energy needed for the chemical reaction to begin.
Activation Energy
Coefficients
Catalyst do this to reactions:
speed up
Only this type of chemical reaction involves a substance combining with oxygen to release energy.
Combustion
NaCl = Na + Cl
Decomposition
A chemical reaction in which more energy is absorbed than released is ______
Endothermic
What has to happen in order for atoms to rearrange?
Bonds have to break by atoms moving and colliding with each other.
Making the particles bigger would _______ the rate of the reaction.
Slow down
The substances written to the right of the arrow are the ________.
Products
Zinc combines with hydrochloric acid, the zinc replaces hydrogen.
Single Replacement
Endothermic reactions require more or less activation energy than exothermic?
More.
Is this equation balanced:4H + H2Cl2 = 6H + 2Cl
Yes
The cooking of an egg is an example of a _______ reaction.
Endothermic Chemical Reaction
Water boiling is a _________ change.
Physical
Sulfurtrioxide reacts with water to make sulfuric acid.
synthesis
Forming a chemical bond _______ energy.
Releases
Balance this equation:P4 + O2 = P4O10
P4 + 5O2 = P4O10
True or False: A catalyst is always an enzyme.
False.
True or false: all substances have a fixed arrangement of atoms.
True