Q1
What are examples of common substances?
ACleaning agents, preservatives, medicines
BOnly water
COnly air
DNothing chemical
SSCClass 9 (SSC)Science and Technology (विज्ञान आणि तंत्रज्ञान)Ch 14 · Topic 2
Practice and Revision - Substances in Common Use
Let us practise and revise what we learned about substances in common use. Various chemical substances are used in everyday life, from clean
Core concept
Common substances include cleaning agents (like soaps and detergents), food preservatives, and medicines, each with specific chemical properties.
How it works
Soaps and detergents work by breaking down grease and dirt, allowing them to be washed away with water using their molecular structure.
Why it matters
Food additives, like preservatives and flavour enhancers, extend shelf life and improve taste, though some require careful regulation.
Key detail
Understanding the safe use, storage, and disposal of common chemical substances is important for health and environmental safety.
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Quick notes
• Common substances: cleaning agents, preservatives, medicines.
• Each has specific chemical properties.
• Soaps/detergents: break down grease, dirt.
• Uses molecular structure to work with water.
• Food additives: preservatives, flavour enhancers.
• They extend shelf life, improve taste.
• Some require careful regulation.
• Safe use, storage, disposal matter for safety.