CRE - Chemical Reactions and Equations (Module Overview)
Chemical Reactions and Equations
Introduction
In this module, you will study the most fundamental part of chemistry: chemical reactions. Now that you have learned to write and name compounds, you will learn how compounds interact with each other and other elements in chemical equations. You will use the Law of Conservation of Mass to balance chemical equations. In addition, you will use the metal activity series to predict products of chemical reactions. Last, you will study the different types of reactions and be able to classify chemical equations accordingly.
Having a periodic table handy is always helpful in chemistry. You may always use a periodic table on assignments, quizzes, and tests in this course.
Download the periodic table by CLICKING HERE. Links to an external site.
Module Lessons Preview
In this module, we will study the following topics:
Law of Conservation of Mass: In this lesson, you will be introduced to the Law of Conservation of Mass as well as the practice of balancing chemical equations.
Types of Chemical Reactions: A chemical reaction is a process that involves the rearrangement of atoms within a substance to form a new compound. We will learn to classify various chemical reactions in five basic categories in this lesson.
Reactivity and Predicting Products: This lesson examines reactivity and predicting the products of chemical reactions by looking at element reactivity in single replacement reactions.
Key Terms
Chemical Change – any change that results in the formation of a new chemical substance
Reactant - A substance participating in a chemical reaction, especially a directly reacting substance present at the initiation of the reaction.
Product - A substance resulting from a chemical reaction.
Subscripts - A distinguishing character or symbol written directly beneath or next to and slightly below a letter or number. In chemical formula writing, the subscript denotes how many atoms or ions of a particular element or polyatomic ion are present.
Law of Conservation of Mass - The notion that mass, or matter, can neither be created nor destroyed.
Coefficient - A number placed in front of a term in a chemical equation to indicate how many molecules or atoms take part in the reaction.
Precipitate – a solid substance formed in a solution during a chemical reaction
Aqueous - A solution dissolved in water.
Synthesis reaction - A direct combination reaction in which two or more reactants combine to form a single product. The general form is: Ax +B → AB
Decomposition reaction - A chemical reaction in which a compound is broken down into simpler compounds, or even into elements. This is the opposite of a synthesis or direct combination reaction. The general form is: AB → A + B
Single replacement reaction - A chemical reaction in which an element replaces one element in a compound. A single uncombined element replaces another in a compound. Two reactants yield two products. The general form is: A + BC → B + AC
Double replacement reaction – a type of chemical reaction where two compounds react, and the positive ions (cation) and the negative ions (anion) of the two reactants switch places, forming two new compounds or products. Also known as a double displacement reaction.
Combustion reaction - The burning of any substance, in gaseous, liquid, or solid form. A chemical reaction that involves the rapid combination of a fuel with oxygen. The general form is: fuel + oxygen → heat + water + carbon dioxide
Activity series - a series of elements that have similar properties, for example, metals, arranged in descending order of chemical activity.
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