🧪 Part 1: Understanding Elements and Compounds

1. Circle the correct definition of an element:

A substance made from two or more types of atoms chemically combined

A substance made from only one type of atom

A mixture of different substances

A substance that can be broken down by chemical means

2. Circle the correct definition of a compound:

A substance made from only one type of atom

A substance formed when two or more elements are chemically combined in fixed proportions

A physical mixture of elements

A single atom floating by itself

3. Fill in the blanks:

Elements consist of _________ type of atom, while compounds are formed when two or more elements are _________ combined in _________ proportions.

🔬 Part 2: Element Symbols and the Periodic Table

4. Match each element with its correct chemical symbol:

1. Hydrogen

2. Oxygen

3. Carbon

4. Sodium

5. Chlorine

6. Iron

A. Fe

B. O

C. H

D. Na

E. C

F. Cl

5. True or False: Chemical symbols always start with a capital letter.

True

False

6. Complete the element symbols (write the missing letters):

a) Calcium: C___

b) Nitrogen: N

c) Magnesium: M___

d) Helium: H___

⚗️ Part 3: Identifying Elements and Compounds

7. Look at these chemical formulas. Tick whether each one is an ELEMENT or a COMPOUND:

H₂O (water)

Element

Compound

O₂ (oxygen gas)

Element

Compound

NaCl (salt)

Element

Compound

Fe (iron)

Element

Compound

CO₂ (carbon dioxide)

Element

Compound

8. Check all the statements that are TRUE about compounds:

They contain only one type of atom

They are formed when elements chemically combine

They have fixed proportions of elements

They can be broken down by chemical means

Water (H₂O) is an example of a compound

🌟 Part 4: Real-World Applications

9. Look around your classroom or think about your home. List THREE examples of compounds you might find:

10. Draw a simple diagram showing the difference between an element and a compound. Use circles to represent atoms and show how they are arranged differently:

11. Explain in your own words: How would you tell someone the difference between an element and a compound?

12. Challenge Question: If you had the compound water (H₂O), what elements would you get if you could break it down chemically?

Elements and Compounds

Elements and Compounds

🧪 Part 1: Understanding Elements and Compounds

🔬 Part 2: Element Symbols and the Periodic Table

⚗️ Part 3: Identifying Elements and Compounds

🌟 Part 4: Real-World Applications

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