Chemistry C3

• What is an ion?

  A charged particle
• Which kinds of elements form ionic bonds?

  Metals and nonmetals
• What charges do ions from Group 1 and 7 form?

  +1 and -1 charges
• What charges do ions from Group 2 and 6 form?

  +2 and -2 charges
• Name the force that holds oppositely charged ions together.

  Ionic bond
• Describe the structure of a giant ionic lattice.

  Regular arrangement of ions in a 3D structure
• Why do ionic substances have high melting points?

  Strong electrostatic forces between ions
• Why don’t ionic substances conduct electricity when solid?

  ions are fixed in place and cannot move
• Why can ionic substances conduct electricity when melted or dissolved?

  ions are free to move and carry charge
• Describe the structure of a pure metal.

  Regular arrangement of closely packed atoms
• Describe the bonding in a pure metal.

  Metallic bonding with delocalized electrons
• What are four properties of pure metals?

  Conductivity, malleability, ductility, luster
• Explain why pure metals are malleable.

  Layers of atoms can slide over each other
• Explain why metals have high melting and boiling points.

  Strong metallic bonds require high energy to break
• Why are metals good conductors of electricity and thermal energy?

  Delocalized electrons can move freely
• What is an alloy?

  A mixture of two or more metals
• Explain why alloys are harder than pure metals.

  Different sized atoms disrupt regular structure