Constituent particles
Where the breaking stops.
Keep breaking a substance and a stage comes where the pieces will not break further.
📚 Chapter Learning Kit
Particulate Nature of Matter · 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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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.
Grinding is physical
Smaller, not different.
Hold a hand lens over the ground chalk and every grain is still chalk.
Sand has a history
The river is the pestle.
Rock breaks apart in the mountains, and rivers grind the pieces finer all the way down.
Interparticle attraction
The hold.
A heap of dry sand falls apart and a stick of chalk does not, so something is pulling.
Why the hold matters
The spine of the chapter.
It is the strength of those pulls that fixes whether a substance is solid, liquid or gas.
What a solid has
Both fixed.
A nail, rock salt, a stone, a block of wood, a key: tap any of them and nothing changes.
📖 Smart notes
What you'll study, topic by topic
1
What Matter Is Made Of
Grind chalk far enough and the breaking has an end; the units there are constituent particles. Dissolve sugar and they hide in the spaces between the water particles, which is how we know both exist.
- Rock is broken apart in the mountains and ground finer by rivers carrying it down.
- Grinding chalk reduces the size of each piece and makes no new substance.
- A stage comes where the pieces cannot be broken down any further.
~40 min · full explanation, examples & memory tricks in the app
2
Solids, Tightly Held
Strong pulls keep the particles of a solid in fixed places, where they can shake but not travel, so the shape and volume are its own. Heat the shaking past the hold and you have the melting point.
- The particles of a substance pull on one another, and that pull is interparticle attraction.
- Its strength depends on the substance and on the gap between the particles.
- The strength of those pulls fixes which state a substance is in.
~45 min · full explanation, examples & memory tricks in the app
3
Liquids, Loosely Held
Poured between three vessels, water is a new shape every time and the same amount every time. A finger pushed through it parts the water and then lets it close, which is movement and a hold in one action.
- A liquid fills whatever container it is poured into, so it has no shape of its own.
- The same water reaches the marked level in every container, so the volume is its own.
- A level that comes out low means a container that was not dry, not lost water.
~45 min · full explanation, examples & memory tricks in the app
4
Gases, and the Space Between
Smoke released in one jar fills two, because almost nothing holds a gas back. A sealed syringe and three marks on a glass show that the room between particles is real in all three states.
- Smoke released in one jar spreads evenly through a second jar placed above it.
- A gas takes all the room it can reach, so it has no volume of its own.
- It also takes the shape of its vessel, so neither property is its own.
~45 min · full explanation, examples & memory tricks in the app
5
Particles in Motion
A grain of colour spreads through water nobody stirred, and a fragrance crosses a room with no breeze. Both say particles never stop moving, and the thermal energy they carry decides the state.
- A grain of potassium permanganate spreads through still water that nobody stirs.
- Water particles prise coloured particles loose and then knock them through the liquid.
- In an insoluble substance the particles grip too tightly to be prised loose.
~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 is the smallest unit a substance can be divided into called?
Beginner
A A magnified chalk grain
B A suspended speck
C A physical change
D A constituent particle
Show answer & explanation
A constituent particle
A stick of chalk is a very large number of them.
A pupil grinds chalk to a powder. What kind of change is that?
Intermediate
A Both, because the powder looks different
B A chemical change, with a new substance
C A physical change, with no new substance
D Neither, because nothing at all has altered
Show answer & explanation
A physical change, with no new substance
Only the size of each piece has been reduced.
Why is taste the evidence used in the sugar activity?
Intermediate
A The water is too deep to see into
B The particles are too small to be seen
C A microscope would be too slow
D Sugar has no colour of its own to look for
Show answer & explanation
The particles are too small to be seen
No ordinary microscope resolves anything that small.
Read these statements about grinding chalk. I. Each speck of the powder is still chalk. II. The grinding has made a new substance. III. Only the size of the pieces has changed. 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, which together are what a physical change means.
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