Valency and Chemical Formula Research and Modeling Task
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PART A: RESEARCH TASK
Application of Valency
- Explain how valency is used to form compounds and write formulas
- Give examples:
PART B: MANILA MODEL PROJECT
- Interlocking Valency Model
- Create element cards showing symbol and valency
- Design interlocking edges based on valency (e.g., $Na = 1$ slot, $O = 2$ slots)
- Join cards to form compounds: $NaCl$, $MgO$, $Al_2O_3$
- Model should clearly demonstrate how valencies combine (EXAMPLE BELOW)
CREATING SODIUM OXIDE MODEL
1. Cut 2 identical sodium pieces
- Each with 1 protruding flap
2. Cut 1 oxygen piece
- With 2 inward slots
3. Join them
- Each $Na$ fits into one slot on $O$
4. Final shape clearly shows:
- 2:1 ratio
- Balanced valencies
BUILDING A VALENCY MODEL FOR $Na_2O$
(Instructions and visual steps for interlocking pieces to form $Na_2O$)
Create similar models for at least 10 compounds of your choice
This question includes visual content: The image features instructional content for a chemistry project. The top section (Part A) explores valency theory. The bottom section (Part B) details a hands-on project using cardboard cutouts: a rectangular box providing step-by-step instructions (1-4) for creating a physical 'Sodium Oxide Model' and a block on the right containing three illustrative image panels showing the assembly of cardboard pieces labeled 'Na+' with tabs and 'O^2-' with slots, demonstrating how these pieces interlock in a 2:1 ratio to form $Na_2O$.
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Hi Musyoka, let's explore how valency is applied to form chemical formulas and understand how to build a visual model to represent them.
Application of Valency and Model Building
First, we look at the research task. Valency is defined as the combining capacity of an atom. It is used to determine the exact ratio in which different atoms combine to form a neutral compound.
Part A: Research Task
Let's use Magnesium Chloride as an example. Magnesium has a valency of two, while Chlorine has a valency of one. To balance them, we need two Chlorine atoms for every one Magnesium atom.
Similarly, for Aluminum Oxide, Aluminum has a valency of three and Oxygen has a valency of two. By crossing their valencies, we determine the formula is A L two O three.
Now, let's look at the Manila Model project. This uses a physical analogy of slots and flaps to show how atoms bond. Think of flaps as positive valency and slots as negative valency.
Part B: Interlocking Valency Model
| Atom Type | Representation |
|---|---|
| Cation (e.g. Sodium) | Protruding Flaps |
| Anion (e.g. Oxygen) | Inward Slots |
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