Word equations

• Chemical reaction


  The atoms are rearranged to form new substances
• Physical change


  The substance stays the same and it is easy to get back what you started with
• Catalyst


  A substance that can increase the rate of reaction without being used up
• Types of reactions


  • Chemical reaction
  • Physical reaction
• In a chemical reaction, a new substance is created
• Chemical reactions


  • Charcoal burning to form carbon dioxide
  • Hydrogen and oxygen forming water
• Word equation for hydrogen and oxygen forming water

  Hydrogen + Oxygen --> water
• Word equation for carbon and hydrogen forming methane

  Carbon + hydrogen --> methane
• Word equation for sodium chloride breaking down into sodium and chlorine

  Sodium chloride --> sodium + chlorine
• Word equation for potassium reacting with water to produce potassium hydroxide and hydrogen


  Potassium + water --> potassium hydroxide + hydrogen
• Reactants in the potassium and water video are potassium and water. The products are potassium hydroxide and hydrogen.
• A new substance has been created because potassium hydroxide has different properties from potassium or water.
• Word equation for hydrogen and oxygen reacting to produce water

  Hydrogen + oxygen --> water
• Reactants in the hydrogen and oxygen demonstration are hydrogen and oxygen. The product is water.
• A new substance was created because the properties of water are different from the properties of hydrogen and oxygen.
• Phrases to match up

  • Reactants are the starting substances in chemical reactions
  • Products are the substances made in chemical reactions
  • Hazards are possible sources of danger
  • Risks are the chances of damage or injury from hazards
• Rules in a chemical reaction

  Reactants go to the left and products go to the right of the arrow

  The arrow must be pointing from the reactants to the products

  The arrow must be an arrow - not an equals sign