⚛️ Part 1: Element Symbols Recognition

1. Match each element name with its correct chemical symbol:

1. Hydrogen

2. Sodium

3. Chlorine

4. Carbon

5. Oxygen

A. O

B. Na

C. H

D. Cl

E. C

2. Circle the correctly written chemical symbols:

he (for Helium)

Ca (for Calcium)

MG (for Magnesium)

Fe (for Iron)

co (for Cobalt)

N (for Nitrogen)

🧪 Part 2: Understanding Chemical Formulas

3. What does the subscript number in a chemical formula tell us?

The atomic number of the element

The number of atoms of that element in the compound

The mass of the element

The charge of the element

4. Fill in the blanks about the formula H₂O:

The formula H₂O contains _____ hydrogen atoms and _____ oxygen atom(s). This compound is commonly known as __________.

5. For each formula below, write how many atoms of each element are present:

CO₂: Carbon atoms: _____ Oxygen atoms: _____

NaCl: Sodium atoms: _____ Chlorine atoms: _____

CaCl₂: Calcium atoms: _____ Chlorine atoms: _____

CH₄: Carbon atoms: _____ Hydrogen atoms: _____

⚗️ Part 3: Writing Chemical Formulas

6. Write the correct chemical formula for each compound:

Water (2 hydrogen, 1 oxygen): __________

Carbon dioxide (1 carbon, 2 oxygen): __________

Methane (1 carbon, 4 hydrogen): __________

Sodium chloride (1 sodium, 1 chlorine): __________

Calcium chloride (1 calcium, 2 chlorine): __________

7. Circle the correctly written chemical formulas:

h2o

CO₂

Nacl

CaCl₂

ch4

NH₃

🔬 Part 4: Applying Your Knowledge

8. Using the periodic table, write the chemical symbols for these elements:

Iron: _____ Gold: _____ Silver: _____ Lead: _____

Potassium: _____ Fluorine: _____ Neon: _____ Aluminium: _____

9. Explain why chemical symbols are important in science:

10. Challenge: If you know that oxygen usually forms compounds with 2 bonds and hydrogen forms 1 bond, predict the formula for:

Hydrogen and oxygen compound: __________

Hydrogen and fluorine compound: __________

Magnesium and oxygen compound (Mg forms 2 bonds): __________

11. Draw and label a simple diagram showing the atoms in a water molecule (H₂O):

📝 Part 5: Reflection

12. List three new chemical formulas you learned today and explain what each subscript means:

13. What is one thing you found challenging about chemical symbols and formulas?

14. How do you think chemical formulas help scientists communicate with each other?

Chemical Symbols and Formulas

Chemical Symbols and Formulas

⚛️ Part 1: Element Symbols Recognition

🧪 Part 2: Understanding Chemical Formulas

⚗️ Part 3: Writing Chemical Formulas

🔬 Part 4: Applying Your Knowledge

📝 Part 5: Reflection

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