Chemical Reactions Review

What type of reaction involves one element replacing another element in a compound?

• Single Displacement Reaction

• Double Displacement Reaction

• Decomposition Reaction

Answer explanation

Single Displacement Reaction involves one element replacing another element in a compound.

What are the products of the chemical reaction pictured?

• CH₄ and CO₂

• CH₄ and O₂

• CO₂ and H₂O

• O₂ and H₂O

Answer explanation

The correct products of the chemical reaction are CO2 and H2O.

Tags

NGSS.HS-PS1-7

What type of reaction involves 2 substances combining to form 1 new compound?

• Single Displacement Reaction

• Double Displacement Reaction

• Synthesis Reaction

Answer explanation

A Synthesis Reaction involves 2 substances combining to form 1 new compound, making it the correct choice in this scenario.

Identify the type of chemical reaction

• Synthesis

• Decomposition

• Single replacement

• Double replacement

• Combustion

Answer explanation

The correct type of chemical reaction is Decomposition, where a compound breaks down into simpler substances.

What is the general form of a combustion reaction?

• A single reactant breaks down into multiple products.

• Two or more reactants combine to form a single product.

• A hydrocarbon reacts with oxygen to produce carbon dioxide and water.

• An element displaces another in a compound.

Answer explanation

A hydrocarbon reacts with oxygen to produce carbon dioxide and water, which is the general form of a combustion reaction.

Which of the following is an example of a synthesis reaction?

Answer explanation

The correct example of a synthesis reaction is 2Mg + O2 -> 2MgO, where two substances combine to form a single compound.

What occurs during a decomposition reaction?

• Two compounds exchange partners.

• A single compound breaks down into two or more simpler substances.

• Two elements combine to form a compound.

• An element replaces another in a compound.

Answer explanation

During a decomposition reaction, a single compound breaks down into two or more simpler substances.

Tags

NGSS.MS-PS1-5

In a single displacement reaction, what happens?

• Two compounds react to form two different compounds.

• A compound breaks down into simpler substances.

• An element in a compound is replaced by a more reactive element.

• Two elements combine to form a compound.

Answer explanation

An element in a compound is replaced by a more reactive element.

• Combustion

• Synthesis

• Decomposition

• Single displacement

Answer explanation

The given reaction is a Single displacement reaction where Zn displaces Cu in CuSO4 to form ZnSO4 and Cu.

Which reaction is an example of a double displacement reaction?

Answer explanation

The correct reaction for a double displacement reaction involves the exchange of ions between two compounds, as seen in the reaction Na2S + Cd(NO3)2 -> CdS + 2NaNO3.