Types Of Reactions Worksheet

A chemical reaction is a process that is usually characterized by a chemical change in which the starting materials (reactants) differ from the products. Chemical reactions tend to involve the movement of electrons, which causes the formation and breaking of chemical bonds. There are several types of chemical reactions and more than one way of classifying them. Below are some of the most common types of reactions. However, if we were asked to name the 4, 5 or 6 main types of chemical reactions, here are the ways to categorize them

Oxidation-Reduction or Redox Reactions

In a redox reaction, the oxidation number of atoms changes. Redox reactions may involve the transfer of electrons between chemical species. The reaction that occurs when I2 is reduced to I– and S2O32- (thiosulfate anion) is oxidized to S4O62- results in the overall redox reaction

2 S2O32− (aq) + I2 (aq) → S4O62− (aq) + 2 I− (aq)


Effective Worksheet Types Of Chemical Reactions
Darlene Young
February 19, 2021
Simple Chemistry English Green
Darlene Young
February 19, 2021

Direct Combination Reaction or Synthesis

In a synthesis reaction, two or more chemical species combine to form more complex products.

A + B → AB

The combination of iron and sulfur to form iron (II) sulfide is an example of a synthesis reaction:

8 Fe + S8 → 8 FeS

Chemical Decomposition or Reaction Analysis

In a decomposition reaction, compounds are broken down into smaller chemical species.

AB → A + B

The electrolysis of water into oxygen and hydrogen gas is an example of a decomposition reaction:

2 H2O → 2 H2 + O2

Single Transfer or Replacement Reaction

A substitution reaction or a single displacement reaction is a reaction characterized by one element being transferred from the compound by another element.

A + BC → AC + B

An example of a substitution reaction occurs when zinc combines with hydrochloric acid. Zinc replaces hydrogen:

Zn + 2 HCl → ZnCl2 + H2

Metathesis Reaction or Multiple Displacement Reaction

In a double displacement reaction or metathesis two compounds exchange bonds or ions to form different compounds.

AB + CD → AD + CB

An example of a double displacement reaction occurs between sodium chloride and silver nitrate to form sodium nitrate and silver chloride.

NaCl (aq) + AgNO3 (aq) → NaNO3 (aq) + AgCl (s)

Acid-Base Reactions

An acid-base reaction is a type of double displacement reaction that occurs between an acid and a base. The H + ion in the acid reacts with the OH – ion in the base to form water and ionic salts:

HA + BOH → H2O + BA

The reaction between acid bromide (HBr) and sodium hydroxide is an example of an acid-base reaction:

HBr + NaOH → NaBr + H2O

Combustion Reaction

The combustion reaction is a type of redox reaction in which a combustible material is combined with an oxidizing agent to form an oxidized product and produce heat (exothermic reaction). Usually, in a combustion reaction oxygen combines with other compounds to form carbon dioxide and water.

Characteristics of a Chemical Reaction

Another example of a chemical change, besides a matchstick being burned is corrosive (rust) iron. Are there any of you who can observe directly how the process of rust formation in iron? Of course when a chemical reaction occurs, we cannot see the process of forming a new compound with the naked eye. However, in this process there are symptoms or characteristics of a chemical reaction that has occurred. Then what are the characteristics of these chemical reactions? The following are some of the characteristics of chemical reactions.

# 1 Occurrence of Color Change

Some chemical compounds have a tendency to absorb and emit color. The ability to absorb and emit color is very specific for several substances. So that when there is a change (conversion) of a substance from reactants to products (new compounds) there will be a change in color.

It could be that two reactants that are colorless will produce a colored compound product, or from a colored reactant to form a colorless product. This event indicates a chemical change or chemical reaction.

# 2 Temperature Changes

Every chemical compound has internal energy. This inner energy is the chemical bond energy in a compound. Breaking bonds requires energy, whereas forming chemical bonds releases energy. When a chemical reaction takes place involves forming more chemical bonds than breaking the chemical bonds, it is excess energy and is released as heat and temperatures rise.

However, if a chemical reaction involves breaking more bonds than forming bonds, then less energy will be absorbed from the environment causing coldness and a drop in temperature or temperature.

# 3 The formation of gas bubbles

The gas produced in chemical reactions sometimes causes bubbles to form. Bubbles can arise from heating a liquid or forming gases in the liquid. These two events are common chemical reactions.

# 4 There is a Volume Change

When a new compound is formed, the reactant compound will decrease drastically. The formation of new compounds and the reduction of these reactants can cause a drastic change in density so that the volume changes.

# 5 Sediment Formation

When two substances are mixed that dissolves in a solvent, a solid forms at the bottom of the solution, indicating a chemical reaction in the solution. The formation of these deposits is sometimes in the form of micro particles (very small) floating in solution so that they are not visible. To be sure, you can shine light on the solution. This phenomenon is known as the Brown Effect or Brown Effect.

# 6 Light Emitting

Chemical reactions sometimes release energy in the form of light. Examples of this chemical reaction are in fireflies and coconut mushrooms, which emit light at night.


# 7 Conductivity Changes

Some chemical reactions can produce or change ionic compounds into other compounds. This will affect changes in the conductivity (ability to conduct heat) of a system.


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