Same All Through, Or Not
One question splits every mixture in two.
If every sample of a mixture matches every other, it is homogeneous. If the parts can be told apart, it is heterogeneous.
↳ The whole classification rests on this single test.
📚 Chapter Learning Kit
Exploring Mixtures and their Separation · Class 9 Science
English 5 topics 260 leveled MCQs 110 flashcards 4 games Free
Shared by a Veda teacher · Generated with Veda AI · Oct 2026
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The Sugar Water Test
Taste the first sip, then the last.
Stirred properly, sugar water is equally sweet at the beginning and at the end of the glass.
↳ A test you can run without any apparatus.
Homogeneous Means Solution
Two words for one thing.
A homogeneous mixture is also called a solution, and the two names are used for exactly the same idea.
↳ Every solution is a mixture, though not every mixture is a solution.
What Concentration Means
Putting a number on the proportion.
How much solute has gone into a stated quantity of solvent or of finished solution is what the word concentration records.
↳ The right proportion is always essential when preparing a solution.
ORS Is Not Just Sugar Water
Why the recipe cannot be changed.
Alter the salt, the sugar or the water and you still have a salt and sugar solution — but it is no longer ORS.
↳ The specified amounts are what make it work.
Dilip Mahalanabis
The doctor behind the formula.
An Indian paediatrician, the first to develop and put into practice the treatment for dehydration from diarrhoea and cholera.
↳ A question of proportion, answered once and used everywhere.
📖 Smart notes
What you'll study, topic by topic
1
Classifying Mixtures, and What a Solution Is
Some mixtures look the same wherever you sample them and some do not, and that single test splits every mixture into two families. A homogeneous one is a solution, made of a solute dissolved in a solvent; a heterogeneous…
- A mixture of sugar and water has the same make-up everywhere in it, so once it is stirred properly the first sip tastes exactly as sweet as…
- Such a mixture is called a homogeneous mixture, and another name for it is a solution; vinegar, which is acetic acid in water, and fizzy dri…
- A solution stays homogeneous, which is to say its uniformity does not break down while it stands.
~30 min · full explanation, examples & memory tricks in the app
2
Concentration of a Solution
Getting the proportion right is what separates a life-saving rehydration drink from ordinary sugar water, and a useful pesticide spray from one that ruins a field. Concentration puts a number on that proportion, and thre…
- Concentration is the amount of solute dissolved in a stated amount of solvent, or of solution, and it is what fixes the proportion between t…
- ORS is a measured thing: set weights of salt and sugar into a set volume of water. Shift either the weights or the volume and you still have…
- Not every sweet drink made at home or sold in a shop counts as ORS, however similar it may look.
~40 min · full explanation, examples & memory tricks in the app
3
Solubility and Crystallization
How much a solvent will hold depends on how warm it is, and that single fact can be turned into a separation technique. Cool a saturated solution and whatever it can no longer carry drops out as pure crystals, leaving th…
- Solubility is the largest quantity of solute a fixed amount of solvent, taken as 100 mL or 100 g, will take up at a stated temperature.
- Once a solution can take up no further solute at that temperature it is described as saturated.
- The temperature has to be quoted because a solid solute in a liquid solvent will generally dissolve more freely as things warm up, while a g…
~40 min · full explanation, examples & memory tricks in the app
4
Distillation and Paper Chromatography
Evaporation recovers the solid but throws the liquid away. Distillation keeps both, by boiling off the lower-boiling liquid and catching its vapour again, while paper chromatography pulls a mixture apart by letting a sol…
- Letting a solvent evaporate does recover the solute, salt from a salt solution for instance, but the solvent itself is lost, so a method is…
- Two liquids that mix into one another, such as acetone and water accidentally poured together, cannot be told apart by evaporation alone eit…
- A homogeneous mixture of two miscible liquids is separated by warming it until the liquid of lower boiling point turns to vapour, then chill…
~40 min · full explanation, examples & memory tricks in the app
5
Separating Heterogeneous Mixtures, Colloids and the Tyndall Effect
Two liquids that refuse to mix can be drained apart, a subliming solid can be lifted straight out as vapour, and stubborn cloudy water can be spun or clumped clear. Behind all of it lies one number: how big the particles…
- Pour water into a vessel holding oil and the two settle into separate layers rather than blending, which is what earns them the name immisci…
- In the activity, 5 mL of mustard oil and 20 mL of water are poured into a 50 mL separating funnel and left alone, whereupon the yellow oil t…
- The stopcock is eased open to run the lower layer of water off into a container, closed once the water has nearly all gone, opened again for…
~50 min · full explanation, examples & memory tricks in the app
❓ Leveled MCQ practice
Try the smart MCQs from this kit
260 questions laddered from warm-up to topper-level, each with an explanation. A taste:
A mixture whose composition is the same throughout is called:
Beginner
A heterogeneous, since the parts can be told apart by eye
B a residue, being whatever the filter paper holds back
C homogeneous, which is also what the word solution means
D a solvent, being the part that does the dissolving
Show answer & explanation
homogeneous, which is also what the word solution means
Another name for such a mixture is a solution.
Which of these is another name for a homogeneous mixture?
Beginner
A A residue
B A solution
C A solvent
D A solute
Show answer & explanation
A solution
The two terms are used interchangeably.
In a mixture of sugar and water, the solute is:
Beginner
A water, because it is present in the larger amount
B both together, since each dissolves into the other
C neither, since no dissolving takes place in this mixture
D sugar, because it is the part that gets dissolved
Show answer & explanation
sugar, because it is the part that gets dissolved
Water is the solvent, since it does the dissolving.
In a mixture of sugar and water, the solvent is:
Beginner
A sugar
B the sweetness
C water
D the container
Show answer & explanation
water
Sugar is the solute, since it gets dissolved.
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