Chapter 5 of 5
Concept Maps
Physical and Chemical Changes — Concept Maps
Gujarat Board · Class 7 · Science
3 concept maps of Physical and Chemical Changes for Gujarat Board Class 7 Science, each also written out as a text outline.
42 questions5 concepts
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3 Concept Maps
Chapter Overview: Physical and Chemical Changes
The map in words
- Physical and Chemical Changes
- Physical Changes
- No new substance formed
- Generally reversible
- Examples
- Melting of ice
- Dissolving sugar
- Cutting paper
- Boiling water
- Crystallisation
- Physical change
- Copper sulphate crystals
- Alum crystals
- Chemical Changes
- New substance formed
- Generally irreversible
- Signs
- Gas evolved
- Colour change
- Heat or light
- New smell
- Examples
- Burning of Mg
- Rusting of iron
- Souring of milk
- Digestion of food
- Photosynthesis
- Rusting of Iron
- Needs oxygen and water
- Faster in coastal areas
- Prevention
- Painting
- Greasing
- Galvanisation
- Stainless steel
- Chromium plating
- Key Reactions
- Mg plus O2 gives MgO
- CuSO4 plus Fe gives FeSO4 plus Cu
- CO2 turns lime water milky
- Vinegar plus baking soda gives CO2
- Physical Changes
Physical and Chemical Changes – Complete Chapter Overview
The map in words
- Changes in Matter
- Physical Changes
- Definition
- No new substance formed
- Physical properties change
- Features
- Generally reversible
- Shape size state colour
- Examples
- Melting of ice
- Dissolving sugar
- Cutting paper
- Boiling water
- Crystallisation
- Definition
- Chemical Changes
- Definition
- New substance formed
- Also called reaction
- Features
- Generally irreversible
- New properties appear
- Signs
- Gas formation
- Colour change
- Heat or light
- Smell change
- Examples
- Burning magnesium
- Rusting of iron
- Baking soda and vinegar
- Copper sulphate and iron
- Definition
- Rusting of Iron
- Conditions needed
- Oxygen from air
- Water or moisture
- Faster in
- Coastal areas
- High humidity
- Salt water
- Prevention
- Painting
- Galvanisation
- Stainless steel
- Greasing
- Conditions needed
- Crystallisation
- Type
- Physical change
- Process
- Saturated solution
- Slow cooling
- Example
- Copper sulphate crystals
- Type
- Physical Changes
Distinguishing Physical and Chemical Changes
The map in words
- Is there a change in the substance?
- Does it form a new substance?
- No, same substance": Physical Change
- Examples: Cutting, Melting, Boiling
- Reversible and No new substance
- Examples: Cutting, Melting, Boiling
- Yes, new substance formed": Chemical Change
- Examples: Burning, Rusting, Digestion
- Generally Irreversible, New substance formed
- Examples: Burning, Rusting, Digestion
- No, same substance": Physical Change
- Does it form a new substance?
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Explore DiagramsFrequently Asked Questions
What are the important topics in Physical and Chemical Changes for Gujarat Board Class 7 Science?
Key topics in Physical and Chemical Changes include Physical Changes, Chemical Changes, Rusting of Iron and Its Prevention, Crystallisation. Study these first, then practise questions on each for Class 7 exams.
What do the concept maps for Physical and Chemical Changes show?
The 3 maps show how the ideas in Physical and Chemical Changes connect: Chapter Overview: Physical and Chemical Changes; Physical and Chemical Changes – Complete Chapter Overview. Each map is also written out as an outline on this page.
How should I revise Physical and Chemical Changes for Class 7 exams?
Learn the core ideas first, then work through the 42 practice questions on Physical and Chemical Changes. Revise definitions regularly and use flashcards for quick recall before the exam.
Sources & Official References
Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
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