Chemical vs Physical Change
The one-question test
↳ New substance formed? Then it's a chemical reaction.
📚 Chapter Learning Kit
Chemical Reactions and Equations · Class 10 Science
English 3 topics 162 leveled MCQs 66 flashcards 4 games Free
Shared by a Veda teacher · Generated with Veda AI
⚡ Veda Bites
💡 Key Idea
💡 Key Idea
🌍 Real World
💡 Key Idea
📖 Definition
🌍 Real World
The whole idea, one bite at a time
Veda Bites are swipeable micro-lessons — each one teaches exactly one idea. Here's a taste from this kit; the app has the full deck.
Signs a Reaction Happened
Five clues at the crime scene
↳ Any of the four signs = bonds being rearranged.
Burning Magnesium Ribbon
The dazzling classroom classic
↳ 2Mg + O₂ → 2MgO — dazzling proof of a chemical change.
Join, Split, Kick, Swap
All of chemistry in four moves
↳ Four patterns classify nearly every reaction you'll meet.
Combination Reactions
Two become one
↳ Many in, ONE out = combination.
Quicklime + Water → White-Wash
The hissing bucket
↳ Two linked reactions paint and polish every white-washed wall.
📖 Smart notes
What you'll study, topic by topic
1
Chemical Reactions and Balanced Equations
How to recognise a chemical reaction, write it as a word and formula equation, balance it by counting atoms, and finish it with state symbols and conditions.
- A chemical reaction produces NEW substances with new properties — unlike physical changes, where the substance stays the same.
- Signs a reaction happened — NCERT lists FOUR: change of state, change of colour, evolution of a gas, change of temperature. A precipitate fo...
- Reactants are written on the left, products on the right, with an arrow (→) showing the direction of change.
~30 min · full explanation, examples & memory tricks in the app
2
Types of Chemical Reactions
Combination, decomposition, displacement and double displacement reactions with their classic experiments — plus exothermic vs endothermic, precipitation and neutralisation.
- Combination: two or more substances form ONE product (A + B → AB) — e.g., CaO + H₂O → Ca(OH)₂ (slaked lime, with much heat).
- Burning of coal (C + O₂ → CO₂) and forming water (2H₂ + O₂ → 2H₂O) are combination reactions.
- Decomposition: ONE substance splits into two or more (AB → A + B); needs energy as heat, light or electricity.
~40 min · full explanation, examples & memory tricks in the app
3
Oxidation, Reduction, Corrosion and Rancidity
Gain and loss of oxygen, redox reactions with the CuO + H₂ classic, the copper-powder activity, and the two everyday effects of oxidation — corrosion of metals and rancidity of food.
- Oxidation = GAIN of oxygen (or loss of hydrogen); reduction = LOSS of oxygen (or gain of hydrogen).
- A redox reaction is one where oxidation and reduction happen TOGETHER — one substance is oxidised while another is reduced.
- Classic redox: CuO + H₂ → Cu + H₂O — copper oxide loses oxygen (reduced), hydrogen gains oxygen (oxidised).
~30 min · full explanation, examples & memory tricks in the app
❓ Leveled MCQ practice
Try the smart MCQs from this kit
162 questions laddered from warm-up to topper-level, each with an explanation. A taste:
Which of these is a chemical change?
Beginner
A melting of ice
B burning of paper
C dissolving sugar in water
D breaking a glass
Show answer & explanation
burning of paper
Burning creates new substances (ash, CO₂); the rest keep the same substance.
In a chemical equation, the substances on the LEFT of the arrow are the:
Beginner
A products
B catalysts
C precipitates
D reactants
Show answer & explanation
reactants
Reactants react to form the products on the right.
Consider these statements about a balanced chemical equation. I. It shows which substances react and which are formed. II. It shows the relative numbers of particles taking part. III. It shows how fast the reaction happens. IV. It obeys the law of conservation of mass. Which statements are correct?
Intermediate
A I, II and IV only
B I and III only
C II and III only
D All four
Show answer & explanation
I, II and IV only
An equation is a statement of WHAT and HOW MUCH, not of how fast. Rate depends on temperature, concentration and surface area, none of which appear in the equation.
Balancing of equations is based on the law of conservation of:
Beginner
A energy
B mass
C momentum
D volume
Show answer & explanation
mass
Atoms — and hence mass — are conserved in reactions.
🃏 Flashcards
Tap a card to flip it
66 flashcards in this kit — the app reviews them with spaced repetition so the right card returns on the right day.
🎮 Learning games
Play your way through this kit
Every game is built from this kit's own content — scores feed your mastery, so playing counts as studying.
Word Match
Word Scramble
True False
Fill Blank
Playable in the app
Study it properly — free, in the app
The full Veda Bites deck, complete notes, spaced-repetition flashcards, leveled MCQs, tests and games for this kit — plus Daily Facts and the Arena, every day.