Q1
What is a chemical change?
AA reaction producing new substances
BNo change in substance properties
COnly a physical change
DNo new substances form
SSCClass 8 (SSC)Science (सामान्य विज्ञान)Ch 13 · Topic 1
Chemical Change and Chemical Bond
Chemical changes result in new substances forming through chemical bonds, and understanding these processes is fundamental to chemistry.
Core concept
A chemical change involves a chemical reaction that produces new substances with different properties than the original materials.
How it works
Signs of chemical change include colour change, gas production, temperature change, and precipitate formation (solid forming from liquids).
Why it matters
Chemical bonds, like ionic and covalent bonds, hold atoms together in compounds, formed through the sharing or transfer of electrons.
Key detail
Understanding chemical changes and bonds helps explain how substances react and combine to form the materials we use every day.
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Quick notes
• Chemical change: reaction produces new substances.
• New substances have different properties.
• Signs: colour change, gas, temperature, precipitate.
• Chemical bonds: ionic, covalent bonds.
• They hold atoms together in compounds.
• Formed via electron sharing or transfer.
• Understanding this explains reactions.
• It explains everyday material formation.