Identify molecules in this chemistry match card activity.

Let's solve this MatchCard Science chemistry worksheet step by step. The goal is to identify which statements correctly describe a molecule, and place a "YES" in the box if it applies.

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🔍 Step 1: Understand What a Molecule Is

A molecule is:
- A group of two or more atoms chemically bonded together.
- These atoms can be of the same element (like O₂) or different elements (like H₂O).
- In covalent molecules, atoms share electrons.
- Molecules are not necessarily large enough to be seen with the naked eye — they are microscopic.
- All atoms have protons (except for hydrogen-1, but even then, it has one proton).

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🔎 Analyze Each Statement and Image

We’ll go through each statement and check whether it describes a molecule.

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#### ✔ Statement 1: "Two or more atoms joined together"

- This is the definition of a molecule.
- Examples shown:
- H₂: Two hydrogen atoms bonded → YES
- NaCl: Sodium and chlorine form an ionic compound; technically not a molecule in the strict sense (it’s a crystal lattice), but sometimes referred to as a formula unit.
- However, in many educational contexts, NaCl is considered a "molecule" when discussing chemical formulas.
- But strictly speaking, NaCl does not form discrete molecules — it forms an ionic lattice.
- So we must be careful here.
- Still, this definition applies to most molecules, so YES is correct.

✔ Answer: YES

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#### ✘ Statement 2: "Large enough to be seen"

- Molecules are microscopic and cannot be seen with the naked eye.
- Even though some large molecules (like proteins) are big, they are still not visible without microscopes.
- So this is false.

✘ Answer: NO

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#### ✔ Statement 3: "The atoms share electrons in their outer level"

- This describes covalent bonding, which occurs in covalent molecules.
- Example: H₂ — two hydrogen atoms share electrons.
- Example: O₂ — oxygen atoms share electrons.
- But NaCl is ionic — electrons are transferred, not shared.
- So this statement only applies to some molecules (covalent ones), not all.
- However, since the task says “describes a molecule” (not “all molecules”), and many molecules do involve electron sharing, this can be true.
- Since H₂ and O₂ are shown, and both involve electron sharing, this is correct for those molecules.

✔ Answer: YES

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#### ✘ Statement 4: "Do Not Have Protons"

- All atoms have protons.
- Hydrogen has 1 proton, oxygen has 8, etc.
- Therefore, no molecule can lack protons because they are made of atoms that have protons.
- So this is false.

✘ Answer: NO

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🧪 Summary of Answers:

| Statement | Correct? | Reason |
|---------|--------|-------|
| Two or more atoms joined together | ✔ YES | Definition of a molecule |
| Large enough to be seen | ✘ NO | Molecules are microscopic |
| The atoms share electrons in their outer level | ✔ YES | True for covalent molecules like H₂ and O₂ |
| Do Not Have Protons | ✘ NO | All atoms have protons |

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📝 Final Answer:

Place "YES" in the following boxes:

- ✔ Two or more atoms joined together
- ✔ The atoms share electrons in their outer level

Leave the others blank (or mark "NO" if allowed).

> ⚠️ Note: While NaCl is shown, it is not a covalent molecule — it's an ionic compound. So the electron-sharing statement doesn't apply to it. But since the question is about what describes a molecule, and many molecules do share electrons, the statement is still valid for some molecules.

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✔ Conclusion:

Correct boxes to mark "YES":

1. Two or more atoms joined together
2. The atoms share electrons in their outer level

Other statements are not correct descriptions of molecules.

Let me know if you'd like a visual version of the completed worksheet!