Bonding & types of bonds

Question 1

Metals

Answer 1

• Shiny
• Ductile (can be stretched out to make wires).
• Malleable
• High melting point (solid).
• Conduct electricity & heat.

Question 2

Non-metals

Answer 2

• Not shiny
• Brittle
• Low melting points (liq or gas).
• Don’t conduct electricity nor heat.

Question 3

Ionic bond

Answer 3

• Metal and nonmetal.
• Compounds are called “salts”.
• Solid at room temperature.
• High boiling and melting points.
• Dissociate in water.
• Gives/takes electrons.

Question 4

Covalent bond

Answer 4

• 2 nonmetal electrons.
• Electrons are shared.
• Compounds are called “true molecules”.
• Liquid or gas at room temperature.
• Low boiling and melting points.
  
  • Polar: Slightly negative bigger molecule/slightly positive smaller molecule.
  • Non-polar: molecules of the same size, same charge.

Question 5

Metallic bond

Answer 5

• Happens only between metals.
• It’s an electron cloud.
• There are many nuclei hidden in the cloud.

Question 6

Electronegativity

Answer 6

-Find the difference between the electronegative values.
Pure covalent: <0.4
Polar covalent: 0.4-1.8
Ionic: >1.8