Science, 11–13 years — 20 topics · MyLeoNes™ Kuks
20 science topics written for 11–13 years — not a older text simplified. In teaching order, each a deck of five cards: the idea, why it exists, a worked example, the common trap and where you meet it.
Science · 11–13 years
Fair tests
A fair test changes one important thing while keeping the others steady, so evidence can answer a clear question.
The particle model
Matter is made of tiny moving particles. Their spacing and movement help explain solids, liquids, gases and changes of state.
Contact forces
A force is a push or a pull. Contact forces, such as friction and air resistance, act when objects touch and can change motion.
Food webs
Living things in an ecosystem are linked by who eats whom. Food webs show that one species can depend on several others, not just one straight chain.
Cells: the basic units of life
Living things may look very different, but they are all built from cells. This topic shows how scientists use microscopes to see these tiny living units and how plant and animal cells share a basic plan.
Energy transfers
Energy does not simply disappear when something stops moving or gets colder. It is transferred between stores, often spreading into the surroundings as thermal energy. Tracking these changes helps explain machines, food, batteries and exercise.
Acids, alkalis and pH
Some liquids can be corrosive, while others can neutralise them. The pH scale gives a way to compare how acidic or alkaline a solution is, and indicators make this invisible difference visible through colour.
Light, reflection and seeing
We see objects when light from a source reaches them and then enters our eyes. Reflection explains mirrors, shiny surfaces and many everyday images. This topic follows the path of light and shows why the angle of reflection matches the angle of incidence.
Electric circuits
A circuit gives electric charge a complete route through components, so devices can work. You will see why a break, a switch or a different arrangement changes what happens.
Chemical reactions
In a chemical reaction, substances change into new substances with different properties. Looking for evidence of a new material helps separate a reaction from simply mixing or changing shape.
Photosynthesis
Green plants use light to make sugar from water and carbon dioxide, releasing oxygen. This explains how a plant builds much of its own food and why light, leaves and air matter to it.
The water cycle
Water moves between oceans, land, air and living things instead of being used once and vanishing. Heating, cooling and gravity drive this repeating journey through evaporation, condensation, precipitation and collection.
Gravity and weight
Gravity pulls objects together, while weight tells us how strongly a planet pulls on an object. Separating these ideas explains why your mass stays the same on the Moon but your weight changes.
Respiration
Respiration is how cells release usable energy from food. It is not the same as breathing: breathing moves gases, while respiration is a chemical process happening inside cells.
Inheritance and variation
Offspring receive genetic information from their parents, but they are not exact copies. Inherited differences and differences shaped by the environment help explain why members of one species resemble one another yet vary.
Natural selection
Natural selection is a process in which inherited differences affect which organisms survive and reproduce. Across many generations, helpful traits can become more common in a population; individuals do not change because they simply need to.
Elements and compounds
Materials can be described by the kinds of atoms they contain and how those atoms are joined.
Sound: vibrations, pitch and loudness
Sound begins with vibrations and travels through matter to reach an ear or a microphone.
Pressure and area
Pressure tells us how concentrated a force is over an area, explaining why the same push can have different effects.
The circulatory system
The heart and blood vessels form a transport network that supplies cells and carries waste away.
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