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Chemical Reactions Overview

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Questions and Answers

What is the difference between gypsum and barite?

Barite is $BaSO_4$ (correct)

Gypsum is found in nature (correct)

Gypsum is used in making Plaster of Paris (correct)

Gypsum is $CaSO_4.2H_2O$ (correct)

How can we get rid of excess $CO_2$?

By reacting calcium hydroxide with carbon dioxide, we get calcium carbonate and water. $Ca(OH)_2 + CO_2 -> CaCO_3 + H_2O$. This converts carbon dioxide into calcium carbonate.

Study Notes

Chemical Reactions

Chemical reactions involve the rearrangement of atoms to form new substances.
Reactants are the substances that undergo a chemical change.
Products are the new substances formed as a result of the chemical change.
The general equation for a chemical reaction is : Reactants → Products
Chemical equations represent the reactants and products and their relative quantities.
Chemical equations are balanced to ensure the law of conservation of mass (that matter cannot be created nor destroyed).

Examples of Chemical Reactions

Calcium hydroxide (Ca(OH)₂) reacts with carbon dioxide (CO₂) to form calcium carbonate (CaCO₃) and water (H₂O).
- Ca(OH)₂ + CO₂ → CaCO₃ + H₂O
Calcium sulfate dihydrate (CaSO₄.2H₂O) can decompose to form calcium sulfate (CaSO₄) and water (H₂O).
- CaSO₄.2H₂O → CaSO₄ + 2H₂O

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Description

This quiz covers the basics of chemical reactions, including the definitions of reactants, products, and the importance of balancing chemical equations. Explore how substances interact and transform into new products through various examples. Test your understanding of the fundamental principles that govern chemical changes.