Ionic and Covalent Bonding 2

• Why does silicon have a higher boiling point than sulfur?

  Silicon has stronger covalent bonds.
• What type of bond does silicon have?

  Giant covalent bond
• Why is the boiling point of sulfur lower?

  It has weaker molecular forces.
• What is magnesium sulfide composed of?

  Magnesium and sulfur
• What happens to magnesium when it forms an ion?

  It loses two electrons.
• What does sulfur do to achieve a full outer shell?

  It gains two electrons.
• What is a covalent bond?

  Electrostatic attraction between shared electrons.
• Why does carbon dioxide have a low boiling point?

  It has weak intermolecular forces.
• What is sublimation?

  Transition from solid to gas.
• Why does CO₂ sublime at low temperatures?

  Weak forces require little energy to break.
• What are the properties and uses of diamond?

  • Held in a tetrahedral arrangement
  • Strong covalent bonds
  • Very hard, used in cutting tools
• What are the properties and uses of graphite?

  • Layered structure with weak intermolecular forces
  • Layers can slide over each other
  • Used in pencils
• What is the formula to calculate the mass of magnesium sulfide?

  Mass = 0.0125 x 56
• If the mass of magnesium is 0.30, what is the mass of magnesium sulfide?

  0.709
• What is the electrical conductivity of simple covalent compounds?

  They do not conduct electricity.
• What is the electrical conductivity of metallic compounds?

  They conduct electricity.
• What is the electrical conductivity of ionic compounds?

  They conduct electricity when dissolved.
• What is the electrical conductivity of giant covalent compounds?

  They do not conduct electricity.
• What is the significance of bubbling gas through limewater?

  It tests for carbon dioxide presence.
• What happens when carbon dioxide is bubbled through limewater?

  It turns milky if CO₂ is present.