Chemical changes involve the formation of new substances with different properties. Here are 20 examples:
Examples of Chemical Changes:
- Burning wood: The wood reacts with oxygen, producing ash, carbon dioxide, and water.
- Rusting iron: Iron reacts with oxygen and water to form iron oxide, commonly known as rust.
- Baking a cake: The ingredients undergo chemical reactions, changing their composition and forming a new substance.
- Cooking an egg: The protein in the egg changes its structure when heated, turning it from liquid to solid.
- Digesting food: Enzymes in our body break down food molecules into smaller ones, making them easier to absorb.
- Photosynthesis: Plants use sunlight, carbon dioxide, and water to produce glucose and oxygen.
- Souring milk: Bacteria convert lactose in milk to lactic acid, causing a sour taste.
- Exploding fireworks: The rapid chemical reactions produce light, heat, and sound.
- Electrolysis of water: Passing an electric current through water separates it into hydrogen and oxygen gas.
- Mixing baking soda and vinegar: The reaction releases carbon dioxide gas, causing fizzing.
- Burning gasoline: Gasoline reacts with oxygen to produce carbon dioxide, water, and energy.
- Making cheese: Bacteria convert lactose in milk to lactic acid, causing the milk to curdle and form cheese.
- Composting: Microorganisms break down organic matter, producing compost.
- Bleaching fabric: Bleaching agents react with colored molecules in fabric, breaking them down and removing color.
- Neutralizing acid with a base: The reaction forms salt and water, changing the pH of the solution.
- Corrosion of metals: Metals react with substances in the environment, forming oxides and other compounds that weaken the metal.
- Spoiling fruit: Enzymes and bacteria break down the sugars and other molecules in fruit, causing it to rot.
- Fermentation: Yeast converts sugars into alcohol and carbon dioxide, used in making wine and beer.
- Burning candles: The wax melts and reacts with oxygen, producing carbon dioxide and water.
- Making soap: Fats or oils react with a strong base, forming soap and glycerol.
