Chemistry Class: Reactions and Equations

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Questions and Answers

Which of the following are the 5 types of reactions?

Double Replacement (correct)

Synthesis (correct)

Single Replacement (correct)

Combustion (correct)

Decomposition (correct)

What is the formula for a synthesis reaction?

element + element = compound

What is a decomposition reaction?

When a compound falls apart

What happens in a single replacement reaction?

One chemical takes the place of another in a reaction Signup and view all the answers

What is the formula for a decomposition reaction?

compound = element + element Signup and view all the answers

What is a synthesis reaction?

Two or more substances react to form a new single substance Signup and view all the answers

What is the formula for a single replacement reaction?

element + compound = element + compound Signup and view all the answers

What occurs in a double replacement reaction?

Two ions trading places and forming new compounds Signup and view all the answers

What is the formula for a double replacement reaction?

compound + compound = compound + compound Signup and view all the answers

What is the formula for a combustion reaction?

compound + oxygen = carbon dioxide + water Signup and view all the answers

What happens during a combustion reaction?

A compound reacts with oxygen to produce water and carbon dioxide, often produces energy. Signup and view all the answers

Evidence of a chemical change includes color change, new odor, formation of gas or solid, __________.

release or absorption of heat Signup and view all the answers

Who was the first person to balance a chemical equation?

Antoine Lavoisier Signup and view all the answers

What do coefficients tell us in a chemical equation?

The number of compounds that are present Signup and view all the answers

What do subscripts indicate in a chemical formula?

The number of atoms of each element Signup and view all the answers

What principle did Antoine Lavoisier discover regarding mass during a chemical reaction?

Principle of conservation of matter Signup and view all the answers

What is a catalyst?

A substance that speeds up a reaction but is not used up in the reaction Signup and view all the answers

What does the conservation of mass principle state?

Matter cannot be created or destroyed, in a chemical reaction, all the atoms present at the beginning are still present at the end Signup and view all the answers

What does 'g' symbolize in a chemical equation?

Gas Signup and view all the answers

What does 'l' symbolize in a chemical equation?

Liquid Signup and view all the answers

What does 's' symbolize in a chemical equation?

Solid Signup and view all the answers

When are energy symbols above the arrow used?

Decomposition reactions Signup and view all the answers

What does a triangle symbolize in a chemical reaction?

Heat Signup and view all the answers

What does 'hv' symbolize in a reaction?

Light Signup and view all the answers

What does 'shck' symbolize in a reaction?

Mechanical Signup and view all the answers

What does 'elec' symbolize in a chemical reaction?

Electrical Signup and view all the answers

What does 'pt' above the arrow symbolize?

Catalyst Signup and view all the answers

What does 'aq' above the arrow symbolize?

Dissolves in water Signup and view all the answers

Study Notes

Types of Reactions

Synthesis reactions combine elements or simpler compounds to form a new compound.
Decomposition reactions involve a compound breaking down into its constituent elements.
Single replacement reactions occur when one element replaces another in a compound.
Double replacement reactions involve the exchange of ions between two compounds.
Combustion reactions involve a compound reacting with oxygen, producing carbon dioxide and water.

Reaction Formulas

Synthesis: element + element → compound
Decomposition: compound → element + element
Single replacement: element + compound → element + compound
Double replacement: compound + compound → compound + compound
Combustion: compound + oxygen → carbon dioxide + water

Chemical Change Indicators

Color change can signify a chemical reaction.
New odors may indicate the formation of different substances.
Emission of light often accompanies chemical reactions.
Formation of gas or solid is a sign of a reaction taking place.
Heat release or absorption is evidence of a chemical change.

Balancing Chemical Equations

Antoine Lavoisier was the first to balance chemical equations, establishing the conservation of mass.
Coefficients in a chemical equation denote the number of molecules or compounds involved.
Subscripts indicate the number of atoms of each element in a compound.

Catalysts and Energy

A catalyst accelerates a reaction without being consumed in the process.
The principle of conservation of mass states that matter cannot be created or destroyed in a chemical reaction.

Symbols in Reactions

"g" represents gas, "l" represents liquid, and "s" represents solid states of matter.
Energy symbols above an arrow indicate the requirement of energy in decomposition reactions.
A triangle above an arrow symbolizes heat, while "hv" indicates light energy.
"shck" signifies mechanical energy and "elec" refers to electrical energy.
"pt" above the arrow represents the presence of a catalyst, and "aq" denotes substances dissolved in water.

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Description

Test your knowledge on the types of chemical reactions and balancing equations with these flashcards. This quiz covers key concepts including synthesis, decomposition, single and double replacement, and combustion. Perfect for reviewing essential topics in general chemistry.