B9 Sci WK1
B9 Sci WK1
B9 Sci WK1
Example: “I season my food with this white powder, but it's not sugar.
What am I?”
Ask learners to discuss and identify each material based on their prior
knowledge.
Vinegar: Acetic Acid (C₂H₄O₂) Note: not binary but can be used
for contrast
Fuel (example: gasoline): various hydrocarbons Note: complex
mixture
Soap: Sodium or Potassium salts of fatty acids Note: varies by soap
Detergents: varies by detergent (Sodium dodecylbenzenesulfonate
can be an example)
Marble: Calcium Carbonate (CaCO₃)
Have them write the chemical symbols next to each element's name.
Assessment:
1. What is a compound?
2. What is the chemical symbol for Sodium?
3. Name a binary compound commonly found at home and list its
elements.
4. Why is vinegar not considered a binary compound?
PHASE 3: Use peer discussion and effective questioning to find out from learners
REFLECTION what they have learnt during the lesson.
Ask: "What do these items have in common, and how might they
be different on a microscopic level?" This will set the context for
the lesson.
Have learners categorize a list of items (like H2O, NaCl, Fe, Ca 2+)
under the correct headings: element, molecule, ion, or compound.
Review and clarify misconceptions
Assessment
1. What is the primary difference between an element and a
compound?
2. If a substance is made up of two types of atoms bonded
together, is it a molecule or a compound? Justify your answer.
3. Write the molecular formula for iron (II) sulphide.
4. Based on your models, how do the bonds in water differ from
those in carbon (IV) oxide?
PHASE 3: Summarize the lesson by reiterating the importance of
REFLECTION understanding the fundamental building blocks of matter.