Chemical Reactions
1. What is a Chemical Reaction?
A Chemical Reaction is the transformation that take place when a substance, or a combination of substances, come into contact and yield new substances. It may be facilitated by external forces or energy.
2. What are the different types of a Chemical Reactions?
Combination or Synthesis Reaction, Decomposition Reaction, Single Displacement Reaction, and Double Displacement Reaction, Precipitation Reaction and Neutralization reaction or Acid-Base Reaction.
3. What is Precipitation Reaction?
These reactions takes place when two aqueous solutions of compounds combine to form an insoluble compound (precipitate) and a soluble compound. For example, the formation of calcium sulfate as a white precipitate when sulfuric acid reacts with calcium carbonate: CaCO3(aq) + H2SO4(aq) → CaSO4(s) + H2O(l) + CO2(g).
4. How would we know when a Reaction has taken place?
There are five key indicators to detect a reaction:
- Change in colour
- Precipitate Formation or solid substance formation and separates from a solution
- Generation of Gas or Emergence of Bubble and odour
- Change in Temperature
- Change in pH
5. What is the difference between Physical and Chemical changes?
Physical changes involve alterations in the shape or form of matter, but they don’t change the fundamental identity of the substances involved. On the other hand, chemical changes lead to the creation of new substances with distinct properties. It’s important to note that the boundary between physical and chemical changes isn’t always clearly defined.
6. What is the difference between a Chemical Reaction and an Equation?
A Chemical Equation is a representation of Chemical Reactions. These equations are balanced to ensure that the same number of atoms of each element is present on both sides. It’s important to understand that in chemical reactions, no new matter is created, and atoms retain their identity.
7. What do we mean by Chemical Equation?
Chemical Equations are distinct from numerical equations. In a typical chemical equation, the left-hand side signifies the reactants, while the right-hand side signifies the products.
8. What do we mean by Decomposition Reaction?
In a Decomposition Reaction, complex molecules or compounds disintegrate into simpler new substances. This type of reaction is characterized by the breakdown of a reactant into simpler products.
9. What do we mean by Acid-Base or Neutralization Reaction?
This type of reaction takes place when an acid and a base react to produce a salt and water. This reaction is named ‘Neutralization Reaction’ since the acid and base neutralize each other.
10. What do we mean by Redox Reaction or Oxidation-Reduction Reaction?
Redox reactions involve changes in the oxidation states of the atoms participating in the reaction. Oxidation refers to the increase in an atom’s oxidation number, while reduction involves a decrease in the oxidation number. When the oxidation states of elements change, it signifies a redox reaction.
11. What happens During a Chemical Reaction?
During a Chemical Reaction, the fundamental units, which are the atoms of the participating molecules or elements, undergo rearrangement to create new molecules. This rearrangement involves the rupture of existing chemical bonds between atoms and this process absorbs energy, and the establishment of new chemical bonds, which results in the release of energy.
12. Define Reactants.
Reactants refer to the chemical substances that undergo a transformation by reacting with each other to produce a new substance in a chemical reaction. These substances are consistently positioned on the left side of the arrow in a chemical equation, symbolizing the starting involved in the reaction.
13. What are 4 types of Chemical Reactions?
Synthesis reactions, Decomposition reactions, Single-replacement reactions and Double-replacement reactions are 4 types of chemical reaction.
14. What is Equilibrium of Chemical Reaction?
Equilibrium of Chemical Reaction or Chemical Equilibrium is the state of chemical reaction where the rate of backward and forward reactions become equal
15. What is Spontaneous Chemical Reaction?
Spontaneous Chemical Reaction is a type of chemical reaction in which the reaction occurs on its own without providing external energy.
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
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