Chemical reactions

• What indicates a gas is produced in a reaction?

  Bubbling and fizzing
• What happens when the gas from the reaction is tested?

  It explodes with a squeaky pop
• What is the word equation for the reaction of hydrochloric acid and magnesium?

  Hydrochloric acid + Magnesium → Magnesium chloride + Hydrogen
• What happens during a chemical reaction?

  Bonds between atoms are broken and formed
• What is evidence of a chemical reaction?

  Bubbles, fizzing, temperature change
• What are exothermic reactions?

  Reactions that release energy as heat
• What is thermal decomposition?

  Breaking down a compound when heated
• What is produced during thermal decomposition of copper carbonate?

  Copper oxide and carbon dioxide
• How is carbon dioxide tested?

  Using limewater
• What happens to limewater when carbon dioxide is bubbled through it?

  Changes from colorless to milky white
• What is the product of magnesium reacting with oxygen?

  Magnesium oxide
• Why is it called an oxidation reaction?

  It involves gaining oxygen
• What is a displacement reaction?

  A more reactive element displaces a less reactive one
• What happens to the less reactive metal in a displacement reaction?

  It becomes a pure element
• What is the word equation for magnesium displacing copper?

  Magnesium + Copper sulfate → Copper + Magnesium sulfate
• Why can't copper displace magnesium?

  Copper is less reactive than magnesium
• What is the reactivity series?

  A list of metals arranged by reactivity
• How can displacement reactions extract metals from oxides?

  Using carbon to displace metals
• What is combustion?

  Burning fuel in the presence of oxygen
• What is the fire triangle?

  Fuel, heat, and oxygen
• What happens when the air hole of a Bunsen burner is open?

  Produces a roaring flame
• What is the result of incomplete combustion?

  Produces less heat and carbon monoxide
• What are some types of fuels?

  Wood, coal, methane, oil
• What factors influence fuel choice?

  Energy produced, pollution, storage ease
• What is burning classified as?

  A chemical reaction
• What is the scientific term for burning?

  Combustion
• What is fuel?

  Any material that can be burnt
• Why does a fire burn more brightly?

  It needs more oxygen to burn
• What is required for complete combustion?

  Enough oxygen to react with fuel
• Why is combustion also called an oxidation reaction?

  Because fuel reacts with oxygen
• What is a problem associated with carbon dioxide production?

  It is a greenhouse gas
• What product is common in both complete and incomplete combustion?

  Water
• Why are both types of combustion considered chemical reactions?

  They are irreversible processes
• What are the products of incomplete combustion?

  Carbon monoxide, carbon, and water
• What is an exothermic reaction?

  A reaction that releases energy
• What are some uses of combustion?

  • Steam engines
  • Engines in cars and trucks
  • Fireworks
• What is the general reaction for metal oxidation?

  Metal + oxygen → metal oxide
• Why is thermal decomposition an appropriate name for that reaction?

  It breaks substances down to simple products
• What does calcium carbonate contain?

  Calcium, oxygen, and carbon
• Why should safety glasses be worn during certain reactions?

  To protect from splashes and debris