Chemical Reactions Quiz Review

Questions and Answers

What is a decomposition reaction?

When something is broken down into smaller molecules (AB→A+B)

What is a single replacement reaction?

A reaction in which one element takes the place of another element in a compound.

What is a double replacement reaction?

A chemical change involving an exchange of positive ions between two compounds.

What is a combustion reaction?

A chemical change in which an element or a compound reacts with oxygen, often producing energy in the form of heat and light. Signup and view all the answers

What is a combination reaction?

A chemical change in which two or more substances react to form a single new substance. Signup and view all the answers

What is a chemical reaction?

Process by which one or more substances are changed into one or more different substances. Signup and view all the answers

Does the mass of reactants equal the mass of products?

True Signup and view all the answers

What is involved in decomposition reactions?

Only involves one reactant and two or more products. Signup and view all the answers

What is the activity series of metals?

A list of metals in order of decreasing reactivity. Signup and view all the answers

Where do double-replacement reactions usually take place?

Usually occur in aqueous solution. Signup and view all the answers

What do double-replacement reactions usually produce?

A precipitate, a gas, or a molecular compound. Signup and view all the answers

Combustion reactions never involve oxygen as a reactant.

False Signup and view all the answers

What is a frequent reactant in combustion reactions besides oxygen?

Hydrocarbon. Signup and view all the answers

If the supply of oxygen is limited during a reaction, the combustion will not be complete.

True Signup and view all the answers

What are some indications that a chemical reaction occurred?

Evolution of energy such as heat or light, production of gas (bubbles), formation of precipitate (solid to liquid), color change. Signup and view all the answers

What are the five general types of reactions?

Combination, decomposition, single-replacement, double-replacement, and combustion. Signup and view all the answers

All chemical reactions fit uniquely into one category.

False Signup and view all the answers

What else can a combination reaction be called?

Synthesis reaction. Signup and view all the answers

How many reactants are in a combination reaction?

Two elements or in some cases two compounds. Signup and view all the answers

What do most decomposition reactions require?

Energy in the form of heat, light, or electricity. Signup and view all the answers

The products can be any combination of elements and compounds.

True Signup and view all the answers

How can you identify a single-replacement reaction?

Noticing that both the reactants and the products consist of an element and a compound. Signup and view all the answers

How many diatomic elements are there?

7 Signup and view all the answers

How is it determined which metal is displaced by another metal?

Depends on the relative reactivities of the two metals. Signup and view all the answers

What can double-replacement reactions also be referred to as?

Double-displacement reactions. Signup and view all the answers

What are the diatomic elements?

H2, N2, O2, F2, Cl2, Br2, I2. Signup and view all the answers

Study Notes

Types of Chemical Reactions

Decomposition Reaction: Breaks down a compound into smaller molecules (AB → A + B).
Single Replacement Reaction: One element replaces another element in a compound.
Double Replacement Reaction: Involves the exchange of positive ions between two compounds, often occurring in aqueous solutions.
Combustion Reaction: Involves a substance reacting with oxygen, producing energy in heat and light.
Combination Reaction: Two or more substances combine to form a single new substance; also known as synthesis reaction.

Characteristics of Chemical Reactions

Chemical Reaction Definition: Transformation of one or more substances into different substances.
Mass Conservation: The mass of reactants equals the mass of products.
Reaction Evidence: Indicators include energy release (heat/light), gas production (bubbles), precipitate formation, and color change.

Specific Reaction Insights

Decomposition Reactions: Typically involve one reactant that breaks down into two or more products, often requiring energy input (heat, light, or electricity).
Combustion Reactions: Commonly involve hydrocarbons and always include oxygen; incomplete combustion occurs when oxygen supply is limited.
Double-Replacement Reactions: Products may include a precipitate, gas, or molecular compound; also referred to as double-displacement reactions.

Reactant and Product Characteristics

Single-Replacement Reaction Identification: Consists of an element and a compound on both reactant and product sides.
Reactivity of Metals: Determined by the activity series, which ranks metals from most to least reactive.
Diatomic Elements: There are 7 diatomic elements: H2, N2, O2, F2, Cl2, Br2, I2.

Reactants in Combination Reactions

Combination Reaction Requirements: Typically requires two reactants, which may be either elements or compounds.
Final Products: The products of chemical reactions can vary widely in elemental and compound composition.

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Description

Test your understanding of various chemical reactions with this quiz. Learn about decomposition, single replacement, and double replacement reactions through definition flashcards. Perfect for students looking to reinforce their class knowledge.