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

//Multiple Choice

Which of the following processes is exothermic?
{
~ Photosynthesis
= Respiration
~ Decomposition of vegetable matter
~ All of the above
}

Which process requires energy to proceed?
{
~ Respiration
= Photosynthesis
~ Combustion
~ Freezing of water
}

In respiration, which of the following is produced?
{
~ Glucose
~ Oxygen
= Carbon dioxide
~ Sunlight
}

Which of the following is a product of photosynthesis?
{
= Oxygen
~ Carbon dioxide
~ Heat
~ Nitrogen
}

Which of the following is the general result of exothermic reactions?
{
~ Energy is absorbed
= Energy is released
~ Energy stays constant
~ No energy change
}

What does the reaction of calcium oxide with water produce?
{
= Calcium hydroxide and energy
~ Calcium sulphate and energy
~ Calcium oxide and energy
~ Calcium carbonate and energy
}

Which of the following gases is produced when lead nitrate decomposes?
{
~ Carbon dioxide
= Nitrogen dioxide
~ Carbon monoxide
~ Methane
}

Which reaction type typically requires a lot of energy to proceed?
{
~ Combination reaction
= Decomposition reaction
~ Combustion reaction
~ Neutralization reaction
}

What is the primary product of respiration?
{
~ Oxygen
~ Glucose
= Water and energy
~ Oxygen and glucose
}

//True or False

Respiration is an exothermic reaction that releases energy. {T}

The decomposition of vegetable matter is an endothermic reaction. {F}

In respiration, oxygen is a product. {F}

The reaction of calcium oxide with water is an exothermic process. {T}

Lead nitrate decomposition is an example of an endothermic reaction. {T}

In an exothermic reaction, energy is released into the surroundings. {T}

Calcium hydroxide is produced when calcium oxide reacts with water. {T}

In photosynthesis, carbon dioxide is released. {F}

The energy produced during respiration is used for various bodily activities. {T}


//Fill in the blanks

In respiration, glucose is broken down to produce carbon dioxide, water, and __________.
{
= Energy
~ Glucose
~ Oxygen
~ Heat
}

Photosynthesis is __________ because it requires sunlight energy.
{
~ Exothermic
= Endothermic
~ Exothermic in nature
~ Irreversible
}

Decomposition reactions, in general, __________ energy.
{
~ Release
= Absorb
~ Neither
~ Both
}

In the decomposition of vegetable matter, energy is __________.
{
= Released
~ Absorbed
~ Transferred
~ Neither absorbed nor released
}

The process of photosynthesis occurs in __________.
{
~ Animals
~ Fungi
= Plants
~ Bacteria
}

In respiration, __________ is released as a waste product.
{
~ Glucose
~ Oxygen
~ Water
= Carbon dioxide
}

The energy released during respiration is used by __________.
{
~ Plants
= Animals
~ Bacteria
~ All of the above
}

The reaction between calcium oxide and water is an example of a __________ reaction.
{
= Combination
~ Decomposition
~ Displacement
~ Redox
}

//Numericals



//Match the following

Match the following items from Column A with their correct corresponding options from Column B\:
{
=Decomposition of vegetable matter -> produces energy
=Decomposition of lead nitrate -> Decomposes to form lead oxide, nitrogen dioxide
=Calcium oxide + water → -> Calcium hydroxide and releases energy
=Photosynthesis -> Requires energy (Endothermic)
=Respiration -> Breakdown Glucose
}


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