$CATEGORY: Science - Khan Academy/1.Chemical Reactions and Equations/1.Chemical Reactions and Equations--Types of Chemical Reactions

//Multiple Choice

What type of reaction occurs when one reactant breaks down into multiple products? {
    ~Combination
    ~Displacement
    =Decomposition
    ~Double Displacement
}

Which reaction combines hydrogen and oxygen to form water? {
    ~Decomposition
    =Combination
    ~Displacement
    ~Redox
}

In a displacement reaction, what happens? {
    ~Two ions exchange places
    ~Heat is absorbed
    =A more reactive element replaces another element in a compound
    ~A compound breaks into multiple products
}

What type of reaction involves the exchange of ions between reactants? {
    ~Combination
    =Double Displacement
    ~Decomposition
    ~Redox
}

Which reaction is an example of an exothermic process? {
    ~Decomposition of iron sulfate
    =Combustion of hydrogen and oxygen
    ~Pulling two magnets apart
    ~Breaking water into hydrogen and oxygen
}

In a redox reaction, oxidation involves\: {
    ~Addition of hydrogen
    ~Removal of oxygen
    =Addition of oxygen
    ~No change in oxygen or hydrogen
}

Which type of reaction requires energy to start breaking down molecules? {
    ~Exothermic
    =Endothermic
    ~Combination
    ~Displacement
}

What is the correct reaction type for the formation of barium sulfate and hydrogen chloride from barium chloride and hydrogen sulfate? {
    ~Combination
    ~Redox
    ~Displacement
    =Double Displacement
}

When hydrogen reacts with oxygen to form water, which element undergoes reduction? {
    ~Hydrogen
    =Oxygen
    ~Both hydrogen and oxygen
    ~Neither hydrogen nor oxygen
}

The decomposition of iron sulfate is generally\: {
    ~Exothermic
    =Endothermic
    ~Neutral
    ~Neither endothermic nor exothermic
}

A reaction where heat is released is called\: {
    ~Redox
    ~Endothermic
    =Exothermic
    ~Combination
}

What memory aid is used to remember decomposition reactions? {
    =Pulling two magnets apart requires energy
    ~Two magnets coming together release energy
    ~Magnets do not attract each other
    ~Breaking magnets into pieces releases energy
}

What type of reaction involves both oxidation and reduction? {
    ~Displacement
    =Redox
    ~Combination
    ~Double Displacement
}

//True or False

A decomposition reaction involves multiple reactants forming a single product. {F}

In a combination reaction, multiple reactants combine to form one product. {T}

A displacement reaction involves the exchange of ions between two reactants. {F}

Respiration is an exothermic process. {T}

In oxidation, hydrogen is removed from a molecule. {T}

Combination reactions usually release energy. {T}

Double displacement reactions involve ion exchange. {T}

The combustion of hydrogen and oxygen to form water is endothermic. {F}

In a displacement reaction, a less reactive element displaces a more reactive element. {F}

The reaction between barium chloride and hydrogen sulfate produces hydrogen gas. {F}

In respiration, glucose is broken down to release energy. {T}

Reduction involves the removal of oxygen from a molecule. {T}

//Fill in the blanks

In a decomposition reaction, one ________ breaks down into multiple products. {
    =reactant
    ~product
    ~ion
    ~molecule
}

A combination reaction involves ________ reactants forming one product. {
    ~no
    ~single
    =multiple
    ~oppositely charged
}

Respiration is an ________ process that provides energy to the body. {
    ~endothermic
    =exothermic
    ~neutral
    ~displacement
}

The removal of oxygen or addition of hydrogen to an element is called ________. {
    =reduction
    ~decomposition
    ~oxidation
    ~respiration
}

In a double displacement reaction, ________ ions exchange places with sulfate ions. {
    ~barium
    ~hydrogen
    ~oxygen
    =chloride
}

When hydrogen reacts with oxygen to form water, heat is ________. {
    ~absorbed
    =released
    ~stored
    ~converted
}

Oxidation of hydrogen occurs because ________ is added to it. {
    ~sulfur
    ~water
    =oxygen
    ~heat
}

In respiration, glucose is ________ to produce energy. {
    =broken down
    ~combined
    ~oxidized
    ~displaced
}

Heat is required to start a ________ reaction. {
    ~exothermic
    =decomposition
    ~displacement
    ~combination
}

//Numericals



//Match the following

Match the following items from Column A with their correct corresponding options from Column B\:
{
=Decomposition reaction -> Requires energy to break down
=Combination reaction -> Multiple reactants, one product
=Displacement reaction -> Heat is released
=Double displacement -> Exchange of ions between reactants
=Redox reaction -> Both oxidation and reduction occur
}

Match the following items from Column A with their correct corresponding options from Column B\:
{
=Oxidation -> Addition of oxygen to an element
=Reduction -> Removal of oxygen from an element
=Exothermic reaction -> Produces energy, e.g., respiration
=Endothermic reaction -> Requires heat to start
=Respiration -> Exothermic process in the body
}

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