Ch.9.2 Chemical Reactions 8th grade

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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?


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