Identifying coefficients and subscripts in chemical formulas worksheet.

It looks like you're trying to solve a chemistry worksheet titled "Counting Atoms Practice", which asks you to identify coefficients and subscripts in chemical formulas. Since I can't view the actual image, I’ll help you solve this type of problem based on the visible text and common examples.

Let’s go through each question step by step, assuming the problems are typical for this kind of practice:

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Section A: Identify the coefficients and subscripts in the following formulas.

> *If there is not one, write "none."*

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#### 1) 3MgCl₂

- Coefficient: The number in front of the formula → 3
- Subscript for Mg: There is no subscript written after Mg, so it's implied to be 1
- Subscript for Cl: The small "2" after Cl → 2

✔ Answers:
- Coefficient: 3
- Subscript for Mg: 1
- Subscript for Cl: 2

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#### 2) V₂O₅

- Coefficient: No number in front → none
- Subscript for V: The "2" after V → 2
- Subscript for O: The "5" after O → 5

✔ Answers:
- Coefficient: none
- Subscript for V: 2
- Subscript for O: 5

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#### 3) 4H₂CO₃

- Coefficient: The number in front → 4
- Subscript for H: The "2" after H → 2
- Subscript for C: No subscript written → 1
- Subscript for O: The "3" after O → 3

✔ Answers:
- Coefficient: 4
- Subscript for H: 2
- Subscript for C: 1
- Subscript for O: 3

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#### 4) 3Na₂C₂O₄

- Coefficient: Number in front → 3
- Subscript for Na: The "2" after Na → 2
- Subscript for C: The "2" after C → 2
- Subscript for O: The "4" after O → 4

✔ Answers:
- Coefficient: 3
- Subscript for Na: 2
- Subscript for C: 2
- Subscript for O: 4

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🔍 Summary of Key Concepts:

- Coefficient: The number in front of a chemical formula (e.g., 3 in 3MgCl₂). It multiplies the entire formula.
- Subscript: The small number after an element symbol (e.g., 2 in Cl₂). It tells how many atoms of that element are in one molecule.
- If no subscript is shown, it means 1 (but we often don’t write it).
- If no coefficient is shown, it means 1 (but again, we don’t write it).

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✔ Final Answers:

| Question | Coefficient | Subscript for [Element] |
|--------|-------------|--------------------------|
| 1) 3MgCl₂ | 3 | Mg: 1, Cl: 2 |
| 2) V₂O₅ | none | V: 2, O: 5 |
| 3) 4H₂CO₃ | 4 | H: 2, C: 1, O: 3 |
| 4) 3Na₂C₂O₄ | 3 | Na: 2, C: 2, O: 4 |

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