Chemical Reactions Quiz pt4

What is a synthesis (combination) reaction?

• A) A reaction where two or more substances combine to form one product.

• B) A reaction where one substance breaks down into two or more products.

• C) A reaction where substances exchange parts to form new compounds.

• D) A reaction where a substance reacts with oxygen to produce heat and light.

In a synthesis reaction, what can the reactants be?

• A) Only elements

• B) Only compounds

• C) Either elements or compounds

• D) Only gases

What will the product of a synthesis reaction always be?

• A) An element

• B) A compound

• C) A mixture

• D) A solution

Which of the following represents a synthesis reaction?

• A) AB → A + B

• B) A + B → AB

• C) AB + C → AC + B

• D) A + B → A + B

What is a decomposition reaction?

• A single compound is broken down into simpler components.

• A single compound is formed from simpler components.

• Two compounds react to form a single compound.

• Two elements react to form a compound.

What is always true about the reactant in a decomposition reaction?

• The reactant is always a compound.

• The reactant is always an element.

• The reactant is always a mixture.

• The reactant is always a solution.

What is often required for most decomposition reactions to occur?

• Energy such as light, heat, or electricity.

• A catalyst.

• A solvent.

• A precipitate.

Which of the following represents a decomposition reaction?

• AB → A + B

• A + B → AB

• A + B → C

• AB + CD → AD + CB

What happens in a single replacement reaction?

• One element replaces a second element found in a compound.

• Two elements combine to form a new compound.

• A compound breaks down into two or more elements.

• Two compounds exchange elements to form two new compounds.

In a single replacement reaction, what happens to the ions?

• (+) changes with (-) and (-) changes with (+)

• (+) changes with (+) and (-) changes with (-)

• (+) changes with (-) and (-) remains the same

• (+) remains the same and (-) changes with (+)