Gases in reactions

• What happens when something is burned in air?

  It reacts with oxygen
• What can the resulting carbon oxides be?

  Acidic or basic
• What is formed when an element burns in air?

  Carbon dioxide
• What color flame does magnesium produce when burned in air?

  Bright white flame
• What is formed when magnesium burns in air?

  Magnesium oxide
• How does magnesium oxide behave in water?

  It is slightly alkaline
• How easily does hydrogen burn in oxygen?

  Very easily
• What can happen when hydrogen burns in oxygen?

  It can be explosive
• What is produced when hydrogen burns?

  Water
• What is the flame color of burning hydrogen?

  Almost invisible pale blue
• What is the combustion product of hydrogen?

  Water vapor
• What is the combustion of hydrogen often used for?

  Testing hydrogen gas
• What happens when small amounts of hydrogen explode?

  It produces a squeaky pop
• What are the characteristics of sulfur combustion?

  • Burns in air
  • Produces sulfur dioxide
  • Flame is pale blue
• What is produced when sulfur burns in air?

  Sulfur dioxide
• How does sulfur dioxide behave in water?

  It is acidic
• What can impurities in air cause when burning hydrogen?

  Yellow flame
• What is the thermal decomposition of metal carbonates?

  Produces carbon dioxide
• What do you get when heating a metal carbonate?

  Carbon dioxide and metal oxide
• What is produced when heating a metal carbonate?

  Carbon dioxide
• What happens to the metal carbonate when heated?

  It decomposes
• What is the result of heating metal carbonate?

  Metal oxide
• What is the general reaction for metal carbonates?

  Metal carbonate → Metal oxide + CO₂
• What is the product of thermal decomposition of metal carbonates?

  Metal oxide
• What is the gas produced during the decomposition of metal carbonates?

  Carbon dioxide
• What is the result of heating metal carbonates?

  Metal oxide and carbon dioxide
• What happens to the metal during thermal decomposition?

  It becomes oxidized
• What is the significance of the thermal decomposition of metal carbonates?

  It is used in various chemical processes
• What is produced when heating metal carbonates?

  Metal oxide and carbon dioxide
• What happens when a substance is dissolved in water?

  It forms a solution.
• How can impurities in the air affect hydrogen?

  They can cause hydrogen to burn with a yellow flame.
• What do metal carbonates produce when thermally decomposed?

  Carbon dioxide (CO₂).
• What do you get when you heat a metal carbonate?

  You get carbon dioxide and metal oxide.
• What is copper(II) carbonate?

  It is a green powder that decomposes easily.
• What happens when you heat copper(II) carbonate?

  It decomposes to form copper(II) oxide and carbon dioxide.
• What is the equation for the thermal decomposition of copper(II) carbonate?

  Copper(II) carbonate decomposes to copper(II) oxide and carbon dioxide.
• What should you do to collect the gas produced in the experiment?

  Use a gas delivery tube to collect it.
• How can you test the gas collected from the experiment?

  By checking if it turns limewater milky.
• Why is carbon dioxide denser than air?

  Because it sinks to the bottom of the tube.
• What happens to carbon dioxide in the experiment?

  It sinks to the bottom of the tube.