Atom, Molecule, Compound, Mixture

Atoms

• Definition: The smallest unit of matter with the properties of an element.
• Composition: Made up of three main parts:
  • Protons: Positively charged particles located in the nucleus.
  • Neutrons: Neutral particles also found in the nucleus.
  • Electrons: Negatively charged particles orbiting the nucleus.

Molecules

• Definition: A molecule is a group of two or more atoms that are chemically bonded together, forming a pure substance.

Diatomic Elements

• Definition: Molecules made up of two atoms of the same element.
• Examples of diatomic elements:
  • $H_2$ (Hydrogen)
  • $N_2$ (Nitrogen)
  • $O_2$ (Oxygen)
  • $F_2$ (Fluorine)
  • $Cl_2$ (Chlorine)
  • $Br_2$ (Bromine)
  • $I_2$ (Iodine)
• Mnemonic: "Have No Fear Of Ice Cold Beer" helps to remember these elements.

Molecules vs. Compounds

• Molecule: A group of two or more atoms bonded together. Can be made of the same or different elements.
• Compound: A specific type of molecule made of atoms from different elements that are chemically bonded.
• Key Point: All compounds are molecules, but not all molecules are compounds.

Mixtures vs. Compounds

• Mixture: A combination of two or more substances (atoms or molecules) that are not chemically bonded and can usually be separated physically.
• Compound: Contains two or more different elements bonded chemically and cannot be separated easily.

Key Differences Between Atoms, Molecules, Compounds, and Mixtures

Group Activities

Activity Steps to Draw Differences:

1. Color-code elements:

   • Hydrogen (H): Color code accordingly
   • Oxygen (O): Color code accordingly
   • Carbon (C): Color code accordingly
   • Sodium (Na): Color code accordingly
   • Chlorine (Cl): Color code accordingly

2. Draw an Atom:

   • Choose an element (e.g., Hydrogen or Oxygen).
   • Draw a single atom (e.g., a small circle labeled "H" or "O").

3. Draw a Molecule:

   • Draw two or more atoms of the same or different elements connected, using lines to show chemical bonds.

4. Draw a Compound:

   • Draw a molecule with two different elements connected.

5. Draw a Mixture:

   • Illustrate various atoms, compounds, and molecules floating around without bonds.

Homework

• Complete Worksheet #3 and prepare a name tag.
• Reflect on scientific questions or any recent events relevant to the class discussion.