🪣 Light for the Living – Chemistry for Young Stars

Lesson 11: Mixtures and Solutions – When Substances Come Together

📍 Scene: Bikwin Village, Taraba State
👩🏾‍🏫 Main Characters: Teacher Hajara, Aisha, Baba Dogo, and the pupils of Bikwin Community Primary School

🌅 11.1 Scene Setting – The Morning by the River Benue

It was a peaceful morning in Bikwin village, near the wide River Benue in Taraba State. The sunrise painted the river gold, fishermen paddled gently on their canoes, and the smell of fried fish filled the air.

Children were already busy helping their parents — some carrying nets, others fanning fires as women mixed pepper sauce for breakfast.

At Bikwin Community Primary School, Teacher Hajara, known for her calm voice and kind smile, had three bowls ready for her science class:

One with clear river water
One with salt
One with groundnut oil

As her pupils arrived, she said with a grin,

“Today, we’ll learn how things come together — some mix like best friends, while others quarrel and separate!”

The class laughed. Even the shyest child leaned forward to see what she would do next.

🫘 11.2 What Is a Mixture?

Teacher Hajara held up a bowl of beans and maize.

“A mixture,” she said, shaking the bowl, “is what we get when two or more substances come together without changing who they are.”

She scooped some into her palm.

“Look closely. Beans are still beans. Maize is still maize. That’s chemistry saying, ‘Let’s stay friends, not become one!’”

The pupils giggled.

Then she pointed to the river outside.

“Our village is full of mixtures — smoke and air from cooking, sand and water from the river, oil and water in soup, pepper and crayfish in your mother’s pot of stew!”

⚖️ 11.3 The Two Main Types of Mixtures

She wrote boldly on the board:

1️⃣ Heterogeneous Mixture – You can see the different parts.
2️⃣ Homogeneous Mixture – Everything looks the same throughout.

She poured sand into water.

“Can you see the sand resting at the bottom?”

“Yeees ma!” the pupils shouted.

“That’s a heterogeneous mixture! The parts don’t mix evenly.”

Then she stirred salt into water until it vanished.

“Now you can’t see the salt, but it’s there. That’s a homogeneous mixture.”

💧 11.4 What Is a Solution?

“A solution,” said Hajara, “is a special kind of mixture where one substance — called the solute — dissolves completely in another — called the solvent.”

She explained with her bowls:

Solute: Salt (the one that dissolves)
Solvent: Water (the one doing the dissolving)
Solution: Saltwater

She tasted a drop and smiled.

“Hmm! Just like the salty water from our fishing nets!”

Then she poured groundnut oil into water and stirred. The oil floated back to the top.

“Ah, you see? These two are quarrelling again! That’s not a solution — just a mixture.”

🏡 11.5 Everyday Mixtures in Bikwin Village

Teacher Hajara turned to the class.

“Let’s see how chemistry hides in our daily lives.”

Type	Example	Where Found
Solid + Solid	Beans and maize	In the kitchen or market
Solid + Liquid	Sand and water	Riverbank
Liquid + Liquid	Oil and water	Cooking
Gas + Gas	Air (oxygen + nitrogen + others)	All around us
Solid + Gas	Smoke and air	Cooking hut

“So you see,” she said, “mixtures are everywhere — in your stew, your river, and even in the air you breathe!”

🧴 11.6 Everyday Solutions in the Village

She continued,

“Now let’s look at some solutions — mixtures that truly dissolve.”

Solution	Solute	Solvent	Everyday Use
Saltwater	Salt	Water	Cooking, fishing nets
Sugar water	Sugar	Water	Making zobo drink
Lime juice	Citric acid	Water	Refreshment
Soap solution	Soap	Water	Washing clothes
Air	Oxygen + others	Nitrogen	Breathing

“Even the air we breathe is a solution — gases mixed so evenly that you can’t see the difference!”

🪣 11.7 Local Analogy – The River Story of Friends and Foes

Then came the part everyone loved — Teacher Hajara’s village story.

“One morning, Baba Dogo went fishing. His wife gave him a bowl of palm oil and said, ‘Mix it with water before cooking.’ He stirred and stirred, but the oil refused to mix and kept floating.

Then his daughter Aisha fetched salt, dissolved it in water, and said, ‘Papa, see how salt disappears completely.’

Baba Dogo laughed, saying, ‘Ah! So salt and water are true friends, but oil and water are quarrelsome neighbours!’”

The whole class roared with laughter.

“Yes,” said Hajara, “when substances are true friends and dissolve, we call the mixture a solution. When they refuse to mix, it’s just a mixture.”

🧂 11.8 Mixture vs. Solution

She drew a simple table on the chalkboard:

Feature	Mixture	Solution
Can you see the parts?	Sometimes yes	No
Do they separate easily?	Yes	No
Do substances dissolve completely?	No	Yes
Example	Oil + Water	Salt + Water

“Remember,” she said, tapping the board, “every solution is a mixture, but not every mixture is a solution!”

🪜 11.9 How to Separate Mixtures

Teacher Hajara brought out common tools from a small basket and said,

“Let’s see how our mothers and farmers use science every day.”

Method	What It Does	Example
Sieving	Separates big particles from small ones	Beans and stones
Filtration	Removes solids from liquids	Sand and water
Evaporation	Removes water, leaving solid behind	Getting salt from river water
Decantation	Pouring away liquid from heavy solid	Sand at the bottom of a bucket
Magnetisation	Removes metals from mixtures	Iron nails from sand

She poured salty water into a small plate and placed it in the sun.
By closing time, white crystals sparkled in the plate.

“Ah!” the pupils cried, “the salt came back!”

“Yes!” she said. “Water may go, but salt never hides forever.”

📚 11.10 Worked Examples

Example 1
🧪 Is zobo drink a mixture or a solution?
✅ It is a solution, because sugar and flavour dissolve completely in water.

Example 2
🧪 Is river water pure?
❌ No. It’s a mixture of water, sand, leaves, and living organisms.

Example 3
🧪 Is oil and water a solution?
❌ No. They do not mix evenly; oil floats on top.

🧫 11.11 Classroom Activity – Mix and Discover!

Objective: To find out which mixtures form solutions.

You need:
Plastic cups, water, salt, sugar, sand, groundnut oil, and a spoon.

Steps:

Mix salt and water — observe.
Mix sugar and water — observe again.
Mix sand and water — observe.
Mix oil and water — observe.

Results:

Salt + water → ✅ solution
Sugar + water → ✅ solution
Sand + water → ❌ mixture
Oil + water → ❌ mixture

🧾 11.12 Summary

A mixture forms when substances come together without changing identity.
A solution is a mixture where one dissolves completely in another.
The solute is what dissolves; the solvent is what does the dissolving.
Homogeneous mixtures look the same all through.
Heterogeneous mixtures have visible parts.
We can separate mixtures by sieving, filtration, evaporation, decantation, or magnetisation.

✍️ 11.13 Review Questions

Define a mixture and a solution in your own words.
Give two differences between mixtures and solutions.
Mention three mixtures you see daily in your village.
Why can’t oil and water form a solution?
Which separation method would you use to:
a) Remove stones from beans?
b) Get salt from seawater?
c) Separate sand from muddy water?

🏠 11.14 Home Challenge

Ask your parents for permission to do a kitchen chemistry experiment:

Mix sugar with water — does it disappear?
Mix garri with water — what happens?

Write down your observations and tell your class next time.

🌻 Teacher’s Closing Thought

As the sun sank behind the river, the children packed their bowls and spoons, still giggling about Baba Dogo and his quarrelsome oil and water.

Teacher Hajara smiled warmly and said,

“My children, chemistry is not far away. It lives in your kitchen, your river, your fishing nets, and even your pepper soup.
Next time you see things mixing or refusing to mix, remember — that is chemistry at work!”

The pupils ran out laughing, shouting,

“Salt and water are friends — oil and water are enemies!”

And by the riverside, their laughter mingled with the splash of paddles and the quiet hum of science in everyday life.

#LightForTheLiving #VillageScience #ChemistryMadeSimple #STEMNigeria #ScienceInOurKitchen #TarabaStories #YoungScientists

Search This Blog

Light for the Living

FOUNDATIONS OF CHEMISTRY FOR YOUNG STARS - Lesson 11: Mixtures and Solutions – When Substances Come Together