Oxidation Number
Chapter Name : Redox Reactions |
Sub Topic Code : 102_11_08_03_02 |
Topic Name : Oxidation Number |
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Sub Topic Name : Combination Reactions |
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Introduction
A reaction in which two or more substances combine to produce a single
substance is known as combination, or synthesis reaction.
Pre-Requisites:
Decomposition
Reaction, exothermic reaction
Activity:
Reaction between
quick lime (Calcium oxide, CaO) and water is a combination reaction.
Real Life Question:
How is the chemical reactivity of metals linked
with their position in the electrochemical series?
Key Words / FlashCards
| Key Words | Definitions (pref. in our own words) |
|---|---|
| Decomposition Reaction | In a decomposition reaction, the substance breaks into new substances. |
| Exothermic reaction | An exothermic reaction is a chemical reaction that releases energy in the form of light or heat. It is the opposite of an endothermic reaction. |
Learning aids / Gadgets
| Gadgets | How it can be used |
|---|---|
| Respiration | Process of respiration is an exothermic reaction |
Real life uses :
The manufacture of ammonia gas from nitrogen and
oxygen is also a combination reaction.
Places to visit :
Chemistry
lab
Practical examples around us
| Examples | Explainations |
|---|---|
| Combustion of coal | Coal burns in air to form carbon dioxide gas. |
What you learn in Theory:
A reaction in which two or more substances combine to produce a single
substance is known as combination, or synthesis reaction. Combination reactions
involve the formation of new bonds and this process releases a large amount of
energy in the form of heat.
What you learn in Practice:
In a combination reaction, a substance is formed as
a result of chemical combination, while in a decomposition reaction, the
substance breaks into new substances.