Worksheet for practicing the naming of molecular compounds, featuring a list of chemical formulas and their corresponding names.

Let’s go through each chemical formula and match it to its correct name using the rules for naming molecular (covalent) compounds.

Rules Recap (Simple Version):

- The first element in the formula keeps its full name.
- The second element gets an “-ide” ending.
- Use prefixes to show how many atoms there are:
- 1 = mono- (but usually skip “mono-” on the first element)
- 2 = di-
- 3 = tri-
- 4 = tetra-
- 5 = penta-
- 6 = hexa-
- etc.

Now let’s check each one:

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1) CS₂ → carbon disulfide
✔ Correct. Carbon (no prefix since it’s first), sulfur becomes sulfide, 2 sulfurs = “di”.

2) SO₃ → sulfur trioxide
✔ Correct. Sulfur + 3 oxygens = trioxide.

3) P₂S₅ → diphosphorus pentoxide
✔ Correct. 2 phosphorus = di-, 5 sulfur = penta- → but wait! It says “pentoxide”, which implies oxygen — but this is sulfur, not oxygen!

⚠️ ERROR HERE!
P₂S₅ should be diphosphorus pentasulfide, NOT pentoxide. “Oxide” means oxygen. This is a mistake in the worksheet.

But since we’re solving what’s given, and assuming the worksheet meant to write “pentasulfide”, or maybe it’s a typo — but based on standard naming, this is incorrect as written.

Wait — let’s double-check: Is there any chance “pentoxide” is used for sulfur? No. Oxide = oxygen only.

So #3 is wrong. Should be diphosphorus pentasulfide.

BUT — looking at the rest of the list, perhaps the student is supposed to just copy or verify? Since the instruction is to solve the problem accurately, we must point out errors.

However, if this is a worksheet where all answers are already filled in and we’re checking them — then we need to flag inaccuracies.

But the user said: “Solve the problem accurately.” So likely, they want us to provide the correct names for each formula.

Actually — re-reading the image: it shows both formulas AND names already paired. So perhaps the task is to verify or learn from it? But the user says “solve the problem”.

Given that, I think the best approach is to assume the student needs to know the correct name for each formula — so we’ll go line by line and correct any mistakes.

Let’s do that carefully.

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Re-evaluating each with corrections:

1) CS₂ → carbon disulfide ✔
2) SO₃ → sulfur trioxide ✔
3) P₂S₅ → should be diphosphorus pentasulfide ✘ (worksheet says “pentoxide” — wrong)
4) H₂O → hydrogen monoxide ✔ (though commonly called water, technically correct)
5) ClO₂ → chlorine dioxide ✔
6) As₂S₃ → diarsenic trisulfide ✔
7) N₂O₃ → dinitrogen trioxide ✔
8) ICl → iodine monochloride ✔
9) SO₂ → sulfur dioxide ✔
10) BCl₃ → boron trichloride ✔
11) PBr₅ → phosphorus pentabromide ✔
12) OF₂ → oxygen difluoride ✔
13) P₂O₃ → diphosphorus trioxide ✔
14) NO₂ → nitrogen dioxide ✔
15) CH₄ → carbon tetrahydride ✔ (also called methane, but systematic name is correct)
16) N₂O → nitrogen monoxide ✔ (sometimes called nitrous oxide, but systematically correct)
17) SCl₆ → sulfur hexachloride ✘ (worksheet says “hexasulfide” — that would imply 6 sulfurs, but here it’s 6 chlorines!)
→ Should be sulfur hexachloride

18) C₃P₄ → tricarbon tetraphosphide ✔
19) SiO₂ → silicon dioxide ✔
20) PCl₃ → phosphorus trichloride ✔
21) CCl₄ → carbon tetrachloride ✔
22) SiI₄ → silicon tetraiodide ✔
23) NF₃ → nitrogen trifluoride ✔

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So two clear errors:

- #3: P₂S₅ → should be diphosphorus pentasulfide, not “pentoxide”
- #17: SCl₆ → should be sulfur hexachloride, not “hexasulfide”

All others are correctly named according to standard covalent compound naming rules.

Since the user asked to “solve the problem accurately”, and the worksheet appears to have pre-filled answers, I believe the intent is to identify and correct any mistakes — or perhaps to confirm correctness.

But to be safe and accurate, I will list the correct name for each formula, noting corrections.

Final Answer will include corrected versions where needed.

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Final Answer:
Here are the correct chemical names for each formula:

1) CS₂ — carbon disulfide
2) SO₃ — sulfur trioxide
3) P₂S₅ — diphosphorus pentasulfide *(corrected from "pentoxide")*
4) H₂O — hydrogen monoxide
5) ClO₂ — chlorine dioxide
6) As₂S₃ — diarsenic trisulfide
7) N₂O₃ — dinitrogen trioxide
8) ICl — iodine monochloride
9) SO₂ — sulfur dioxide
10) BCl₃ — boron trichloride
11) PBr₅ — phosphorus pentabromide
12) OF₂ — oxygen difluoride
13) P₂O₃ — diphosphorus trioxide
14) NO₂ — nitrogen dioxide
15) CH₄ — carbon tetrahydride
16) N₂O — nitrogen monoxide
17) SCl₆ — sulfur hexachloride *(corrected from "hexasulfide")*
18) C₃P₄ — tricarbon tetraphosphide
19) SiO₂ — silicon dioxide
20) PCl₃ — phosphorus trichloride
21) CCl₄ — carbon tetrachloride
22) SiI₄ — silicon tetraiodide
23) NF₃ — nitrogen trifluoride