DepEd MELC reviewer for Grade 10 Science, Quarter 4. Master the concepts, tables, and common-mistake warnings below.
1
The Mole Concept
One mole = 6.022 × 10²³ particles (Avogadro’s number). Molar mass (g/mol) comes from the periodic table.
2
Balancing Chemical Equations
Matter is conserved — atoms of each element must be equal on both sides.
2H₂ + O₂ → 2H₂O
⚠️ Common Mistake
Balance by changing COEFFICIENTS (the big numbers), never the subscripts — that would change the substance.
3
Biomolecules
| Biomolecule | Function |
|---|---|
| Carbohydrates | Quick energy |
| Lipids | Stored energy, membranes |
| Proteins | Building, enzymes |
| Nucleic acids | Store genetic info |
4
Types of Reactions
| Type | Pattern |
|---|---|
| Synthesis | A + B → AB |
| Decomposition | AB → A + B |
| Single replacement | A + BC → AC + B |
| Double replacement | AB + CD → AD + CB |
📌 Quick Recap — Master These
Before your test, make sure you can confidently do each of the following:
- Explain and apply The Mole Concept.
- Explain and apply Balancing Chemical Equations.
- Explain and apply Biomolecules.
- Explain and apply Types of Reactions.
Re-read any section above where you hesitate, then try the worked example again without looking.