Look around first
Hardly anything is one thing.
The staircase, the air, your clothes, this book: all of it is matter made of tiny particles.
📚 Chapter Learning Kit
Elements, Compounds and Mixtures · Class 8 Science · Curiosity
English 5 topics 175 leveled MCQs 85 flashcards 5 games Free
Shared by a Veda teacher · Generated with Veda AI · Oct 2026
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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.
What a mixture is
Together, and unchanged.
Put two or more substances together so that each one holds on to the properties it had.
The parts have a name
Components, in science.
The separate substances inside a mixture are called its components.
Is air a mixture?
The hardest case.
You cannot see it, you cannot pick anything out of it, and we talk about it as one thing all day.
What is in the air
Five of them.
Nitrogen makes up the largest share by a long way, at about seventy-eight parts in a hundred.
What each gas does
Life, and burning.
Oxygen is what most living things need to stay alive, and it is also what lets things burn.
📖 Smart notes
What you'll study, topic by topic
1
What a Mixture Is
Put two or more substances together so that each keeps its own properties and nothing reacts, and you have a mixture. Whether you can see the parts decides which kind it is, not whether it is one.
- A mixture is two or more substances put together, each keeping the properties it had.
- No component of a mixture reacts chemically with any other.
- The separate substances in a mixture are called its components.
~40 min · full explanation, examples & memory tricks in the app
2
Air, and What Is In It
Air is the hardest case in the chapter: invisible, unseparable by eye, and a uniform mixture all the same. Lime water going milky proves the carbon dioxide, and dust turns out to be a passenger.
- Air is a uniform mixture of gases, blended so evenly that every breath matches the last.
- Nitrogen is about seventy-eight per cent of it and takes no part in burning.
- Oxygen is what most living things need, and what lets things burn.
~45 min · full explanation, examples & memory tricks in the app
3
Pure Substances, and Splitting Water
On a packet, pure means unadulterated. In science it means one kind of particle that no physical process divides. Water passes that test and an electric current still takes it apart.
- On a packet, pure means unadulterated: nothing cheaper has been put in.
- Adulteration is illegal, lowers quality and can be dangerous to health.
- In science a pure substance has nothing else present and one kind of particle.
~45 min · full explanation, examples & memory tricks in the app
4
Elements and Compounds
An element cannot be made simpler and is one kind of atom. A compound is different elements combined in a fixed ratio, with properties of its own: hydrogen burns, oxygen feeds fire, water puts it out.
- An element cannot be broken down into anything simpler by any means at all.
- Each element is made of one kind of particle, called an atom.
- Two or more atoms joined into a stable particle make a molecule.
~46 min · full explanation, examples & memory tricks in the app
5
Telling a Mixture from a Compound
Two samples from the same two elements, three tests on each. One shows its colours, gives up its iron to a magnet and makes odourless gas; the other does none of those and smells of rotten eggs.
- Iron filings and sulfur powder are weighed out, so both samples hold the same proportions.
- Sample A is the mixture, showing black specks and yellow specks side by side.
- Sample B is made by heating half of Sample A to a black mass, then cooling and grinding it.
~48 min · full explanation, examples & memory tricks in the app
❓ Leveled MCQ practice
Try the smart MCQs from this kit
175 questions laddered from warm-up to topper-level, each with an explanation. A taste:
What are the separate substances inside a mixture called?
Beginner
A Its components
B Its elements that are mixed
C Its compounds that are mixed
D Its particles
Show answer & explanation
Its components
The everyday word is ingredients, which is not the same thing.
What must be true of the substances in a mixture?
Beginner
A Each one must be clearly visible to the naked eye
B Each one is changed into something quite new
C Each one keeps the properties it had before
D Each one must be in the same state
Show answer & explanation
Each one keeps the properties it had before
Which is why they can still be found afterwards.
A bowl of sprout salad shows its gram, onion and tomato. What kind of mixture is it?
Beginner
A Neither uniform nor non-uniform
B A compound
C Uniform
D Non-uniform
Show answer & explanation
Non-uniform
Its parts can be made out and are not spread evenly.
Read these statements about a mixture. I. Its components keep their own properties. II. Its components react chemically together. III. Its components can sometimes be seen. Which are correct?
Intermediate
A I and II only
B II and III only
C I and III only
D I, II and III
Show answer & explanation
I and III only
I and III. Reacting is what a mixture does not do.
🃏 Flashcards
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85 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.
Categorization
Fact Or Myth
Sequence Builder
Memory Match
Speed Quiz
Playable in the app
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