Introduction Teaching Points a Chemical Reaction Reactants Products

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Introduction • Teaching Points : (a) Chemical Reaction • Reactants • Products • Writing

Introduction • Teaching Points : (a) Chemical Reaction • Reactants • Products • Writing a Chemical reaction • Reversible Chemical reaction • Irreversible Chemical reaction • Specific Aim : To appreciate the idea of a Change, to know more Chemical reaction, to be able to classify Reactants and Products, to be able to cite examples of Chemical reactions.

 • Question: What is a Chemical change? • Answer: • A change where

• Question: What is a Chemical change? • Answer: • A change where a new substance has formed is known as Chemical change • Question: What are the characteristics of a Chemical change? • Answer: A Chemical change has taken place if one or more of the following changes occur: There is a colour change. Bubbles of gas are given out. There is a change in the temperature of the substances. An insoluble substance is formed as a result of the interaction of two substances. A Chemical change is Irreversible. • Question: Give an example of a Chemical change • Answer: Rusting of Iron. • Question: What happens in a Chemical change? • Answer: A New Substance is formed e.

Introduction • You know cadets; • When substances are involved in a chemical change,

Introduction • You know cadets; • When substances are involved in a chemical change, they are said to undergo a Chemical reaction. • There is a change in the nature of the particles that make up the original substances, their structure undergoes a change. • Today, we shall discuss about Chemical reaction!

Chemical Reaction Chemical Reaction: A Chemical reaction is a process that leads to the

Chemical Reaction Chemical Reaction: A Chemical reaction is a process that leads to the transformation of one set of chemical substances to another Reactants: The chemical substances which undergo a chemical reaction are known as Reactants. Products: The chemical substances that are produced out of a chemical reaction are known as Products. Writing a Chemical reaction: In a chemical reaction, Reactants are written on the left side of the chemical equation Products are written on the Right side of the chemical equation An arrow with a direction is placed in between Reactants and Products. The arrow is generally directed towards the products side.

Reversible and Irreversible Reversible Chemical reaction: The chemical reaction which is bi-directional is known

Reversible and Irreversible Reversible Chemical reaction: The chemical reaction which is bi-directional is known as Reversible reaction. In a Reversible chemical reaction, one Can get the reactants back from the products. Irreversible Chemical reaction: The chemical reaction which is Uni-directional is known as Irreversible reaction. In a Irreversible chemical reaction one cannot get the reactants back from the products.

Chemical Reaction Example of a chemical reaction: Rusting of Iron Iron + Oxygen +

Chemical Reaction Example of a chemical reaction: Rusting of Iron Iron + Oxygen + Water Iron Oxide

Some Questions & Answers Question: What are Reactants? Answer: The chemical substances which undergo

Some Questions & Answers Question: What are Reactants? Answer: The chemical substances which undergo a chemical reaction are known as Reactants. Question: What are Products? Answer: The chemical substances that are produced out of a chemical reaction are known as Products. Question: What are the steps of writing a Chemical equation? Answer: In a chemical reaction, Reactants are written on the left side and Products are written on the Right side of the chemical equation • An arrow with a direction is placed in between Reactants and Products. • The arrow is generally directed towards the products side. • • • •

Some Questions & Answers • • • Question: What is a Reversible chemical reaction?

Some Questions & Answers • • • Question: What is a Reversible chemical reaction? Answer: The chemical reaction which is bi-directional is known as Reversible reaction. In a Reversible chemical reaction, one can get the reactants back from the products. Question: What is an Irreversible chemical reaction? Answer The chemical reaction which is uni-directional is known as Irreversible reaction. In an Irreversible chemical reaction, one cannot get the reactants back from the products. Question: Give an example of a chemical reaction? Rusting of Iron + Oxygen + Water ----- Iron Oxide

Question? • 1. Question: Write the chemical reaction between Hydrogen and Oxygen to form

Question? • 1. Question: Write the chemical reaction between Hydrogen and Oxygen to form Water. • Answer: Hydrogen + Oxygen -----Water. • 2. Question: Write the chemical reaction between Sodium and Chlorine to form Sodium Chloride (Common Salt). • Answer: Sodium + Chlorine ------Sodium Chloride (Common Salt)