Memory Anchor:

• Super Challenge:

  Stretch:

  Challenge:

Key Questions:

1. Substances that consist of small molecules are most commonly which states of matter at room temperature?
   • They tend to have lower boiling points, meaning they commonly exist at room temperature either as gases or liquids.
2. How does the size of a molecule affect the size of its intermolecular force?
   • The larger the molecule the greater the size of its intermolecular Force. Hence larger molecules tend to have higher melting and boiling points.
3. Explain why substances that consist of small molecules often have low boiling and melting points
   • Smaller molecules tend to have weaker intermolecular Forces of attraction. This means only small amounts of Energy are required to overcome the intermolecular Forces that hold molecules of that substance together.
4. Why are covalent compounds unable to conduct electricity?
   • Because covalent molecules carry no overall charge
5. What is the difference between intermolecular forces and intramolecular forces?
   • Intermolecular Forces are the Forces of attraction between different molecules of the same substance. Intramolecular Forces are the bonds between atoms of the same molecule eg. ionic or covalent bonds.
6. Which is stronger: A covalent bond or intermolecular force?
   • Intermolecular Forces are weak when compared with covalent bonds and explain the bulk properties of molecular substances.