Chemical Reactions
Map
Arrows point from what you learn first to what it opens. Point at a concept to light up its chain and where it comes back deeper. Right-click a concept (or press and hold it) for its lessons and stories.
- Proven to depth123
- Open
- Locked
- Comes back deeper
Learning path
In the order the concepts build on each other.
- Physical and chemical changeLockedA physical change alters a substance's shape, size or state but leaves it the same stuff, like ice melting or paper being torn. A chemical change makes new stuff, like an egg cooking or toast burning.Opens after: Melting and freezing, Dissolving
- Chemical reactionLockedA process in which substances (the reactants) turn into different substances (the products), like iron, oxygen and water turning into rust. Bubbles of gas, a new colour, heat or light, a new smell or a new solid are clues that one is happening.Opens after: Physical and chemical change
- BurningLockedA chemical reaction in which a fuel, like wood or wax, reacts with oxygen from the air and gives off heat and light. A fire needs fuel, oxygen and heat (the fire triangle): take any one away and it goes out.Opens after: Chemical reaction
- Conservation of massLockedIn a chemical reaction mass is neither made nor lost: the products weigh exactly what the reactants did, as Lavoisier showed by weighing reactions in closed containers (1789). When mass seems to vanish or appear, a gas has slipped out or in.Opens after: Chemical reaction
Connections to other domains
- Chemical reaction leads to CompoundChemical Bonding
- Conservation of mass, depth 2 needs Chemical formulaChemical Bonding
- Physical and chemical change needs Melting and freezingMatter and Its Properties
- Physical and chemical change needs DissolvingSolutions, Acids and Bases