Ch.9.2 Chemical Reactions 8th grade
T
A reaction type can be identified by studying the reactants and products shown in the chemical equation.
One product is formed.
How can you identify a synthesis reaction?
decomposition
Hydrogen peroxide breaks down to form water and oxygen, for example.
F
A combustion reaction usually releases ions and light.
F
Burning fossil fuels produces energy through decomposition reactions.
F
Combining hydrogen and oxygen to form water is an example of a double-replacement reaction..
F
Combustion reactions always contain hydrogen as a reactant.
T
Decomposition is the reverse of synthesis.
F
Dynamite exploding is an example of a synthesis chemical reaction.
F
In single-replacement reactions and in synthesis reactions, elements change places with other elements in compounds.
T
Light causes the decomposition of hydrogen peroxide.
F if
NaCl + AgNO3 ~> NANO3 + AgCl is an example of a single-replacement reaction.
combustion
Substance combines with oxygen and releases energy.
F
Synthesis reactions always involve oxygen.
T
The negative ions in two compounds switch places in a double-replacement reaction.
burning fossil fuels
Which example is a combustion reaction?
2KCIO3 - 2KCI + 302
Which example is a decomposition reaction?
negative ions
Which objects switch places in a double-replacement reaction?
synthesis
Which reaction type best describes H20 + SO3 ~> H2SO2?
2KCIO2 -> 2KCI + 302
Why is this a decomposition reaction?
F
combustion reaction often produces sodium chloride and water.
double replacement
describes a type of reaction in which negative ions in two compounds switch places, forming two new compounds
single replacement
describes a type or reaction in which one element replaces another element in a compound
HCI + FeS - FeCl2 + H2S
example is a double-replacement reaction?
HCI + Fes ~> FeCl2 + H2S
is this a double-replacement reaction?
Zn + 2HCI - ZnCl2 + H2
is this a single-replacement reaction?
H20 + SO3 -> H2SO4
is this a synthesis reaction?
combustion
reaction, a substance combines with oxygen and releases energy-
decomposition
reaction, one compound breaks down and forms two or more substances.
single-replacement
reaction, one element replaces another element in a compound.
double-replacement
reaction, the negative ions in two compounds switch places, forming two new compounds.
synthesis
reaction, two or more elements or compounds combine and form one compound.
CH4 + 202 -> CO2 + 2H20
this is a combustion reaction?