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

//Multiple Choice

What is formed when calcium oxide \((CaO)\) reacts with water? {
    ~Calcium carbonate
    =Calcium hydroxide
    ~Magnesium oxide
    ~Calcium sulfate
}

What is a characteristic of a decomposition reaction? {
    ~Multiple reactants combine to form a product
    =One reactant breaks down into multiple products
    ~No energy is required
    ~It always involves exothermic reactions
}

In a combination reaction, the number of reactants\: {
    ~Is always one
    ~Combines to form multiple products
    =Combines to form one product
    ~Can vary, forming more than one product
}

What energy form is used in photochemical decomposition? {
    ~Heat
    ~Electricity
    =Light
    ~Chemical energy
}

What is the product when magnesium reacts with oxygen? {
    ~Magnesium carbonate
    =Magnesium oxide
    ~Magnesium hydroxide
    ~Magnesium sulfate
}

In a combination reaction, energy is generally\: {
    ~Absorbed
    =Released
    ~Not involved
    ~Constant
}

What does the reaction \(2FeSO_4\) \= \(Fe_2O_3\)+ \(SO_2\) + \(SO_3\) ​ represent? {
    ~Combination reaction
    =Decomposition reaction
    ~Synthesis reaction
    ~Combustion reaction
}

What is the product when calcium carbonate decomposes? {
    =Calcium oxide and carbon dioxide
    ~Calcium hydroxide
    ~Calcium sulfate
    ~Calcium nitride
}

What type of reaction is the dissociation of water into hydrogen and oxygen using electricity? {
    ~Photochemical decomposition
    =Electrolytic decomposition
    ~Thermal decomposition
    ~Combination reaction
}

//True or False

In combination reactions, one reactant breaks down into multiple products. {F}

The decomposition of silver chloride \((AgCl)\) requires heat. {F}

All combination reactions are exothermic. {F}

The combustion of coal is a combination reaction. {T}

The reaction \(2Mg\) + \(O_2\) \= \(2MgO\) is an example of a combination reaction. {T}

Magnesium burns with a bright white flame in oxygen to form magnesium oxide. {T}

Electrolytic decomposition reactions require heat energy. {F}

The decomposition of iron sulfate is an example of photochemical decomposition. {F}

The decomposition of water into hydrogen and oxygen requires sunlight energy. {F}


//Fill in the blanks

The decomposition of iron sulfate \((FeSO_4)\) produces \(Fe_2O_3\), \(SO_2\), and ________. {
    ~\(O_2\)
    =\(SO_3\)
    ~\(CO_2\)
    ~\(H_2O\)
}

Magnesium burns with a dazzling white flame to form ________ oxide. {
    ~Magnesium
    ~Calcium
    =Magnesium oxide
    ~Iron
}

The energy required in a decomposition reaction is usually in the form of ________. {
    ~Heat
    ~Electricity
    ~Light
    =All of the above
}

\(2AgCl\) \= \(2Ag+Cl_2\) is an example of ________ decomposition. {
    ~Electrolytic
    ~Thermal
    =Photochemical
    ~None
}

The decomposition of calcium carbonate produces calcium oxide and ________. {
    ~\(SO_2\)
    =\(CO_2\)
    ~\(H_2O\)
    ~\(NO_2\)
}

The reaction \(2H_2O\) \= \(2H_2\) + \(O_2\)  is an example of ________ decomposition. {
    =Electrolytic
    ~Photochemical
    ~Thermal
    ~Combination
}

The reaction \(2H_2\) + \(O_2\) \= \(2H_2O\) is a ________ reaction. {
    =Combination
    ~Decomposition
    ~Combustion
    ~Synthesis
}

The chemical formula for magnesium oxide is ________. {
    =\(MgO\)
    ~\(Mg_2O_2\)
    ~\(Mg_2O\)
    ~\(MgO+2\)
}

//Numericals



//Match the following

Match the following items from Column A with their correct corresponding options from Column B\:
{
=decomposition of water -> requires sunlight
=2H2O \= 2H2 + O2 -> Electric decomposition
=CaO reacts with water -> Calcium Hydroxide
=AgCl -> Photochemical Decompose
}


//******** END **********