Solved Examples on Chemical Reaction
Example 1: In the given statement “sodium metal reacts with water to produce sodium hydroxide and hydrogen,” identify the reactants and products.
Solution:
Reactants: sodium metal and water; Products: sodium hydroxide and hydrogen.
Example 2: Balance the chemical equation: _Al + _O2 → _Al2O3 .
Solution:
Balanced equation: 4Al+3O2→2Al2O3.
Example 3: Predict the products and balance the chemical equations for the given double-replacement reactions:
- Zn(NO3)2+NaOH→?
- HCl+Na2S→?
Solution:
Zn(NO3)2+2NaOH→Zn(OH)2 + 2NaNO3
2HCl + Na2S→2NaCl + H2S
Example 4: Complete and balance the combustion equations:
- Combustion of propane, C3H8
- Combustion of ammonia, NH3
Solution:
C3H8 + 5O2→3CO2 + 4H2O
4NH3 + 3O2→2N2 + 6H2O
Example 5: Assign oxidation numbers to the atoms in each substance:
- Br2
- SiO2
Solution:
For Br2, each bromine atom has an oxidation number of 0.
For SiO2, following the rules, oxygen is assigned an oxidation number of -2. To balance the sum of oxidation numbers, the silicon atom is assigned an oxidation number of +4.
Chemical Reactions
Chemical Reaction is the disruption of existing bonds within reactant molecules and the creation of fresh bonds in product molecules, culminating in the formation of a new substance. These reactions are all around us, spanning from the biochemical processes in our bodies that extract energy from food to the source of sunlight, where chemical reactions are used to produce the light we receive.
In this article, we will understand the meaning and characteristics of Chemical Reactions. This article will cover the various types of Chemical Reactions: Combination or Synthesis Reaction, Decomposition Reaction, Single Displacement Reaction, and Double Displacement Reaction. We also discuss factors affecting the rate of Reaction and practice questions to understand this article.
Table of Content
- What is a Chemical Reaction?
- Characteristics of a Chemical Reaction
- How would we know when a Reaction has taken place?
- Chemical Equation
- Balancing a Chemical Equation
- Types of Chemical Reaction