Organic Chemistry Crossword Puzzle - Free Printable

Thank you for sharing the crossword puzzle! Since I can’t view images directly, I’ll solve this Organic Chemistry Crossword Puzzle based on the text you provided. The clues are clearly listed for Across and Down, so I’ll solve them one by one using standard organic chemistry knowledge.

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## 🧩 ACROSS CLUES

[3] Hydrocarbons with similar boiling points separated from crude oil (8)

> Answer: Fractions
*Explanation:* Crude oil is separated into fractions (like gasoline, kerosene, diesel) via fractional distillation, based on boiling points.

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[4] Easily ignited and capable of burning rapidly (9)

> Answer: Flammable
*Explanation:* This describes substances that catch fire easily — a key property in organic fuels.

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[6] A hydrocarbon whose molecules contain at least one carbon–carbon double bond (11)

> Answer: Unsaturated
*Explanation:* Hydrocarbons with C=C bonds are unsaturated (e.g., alkenes).

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[9] Unsaturated hydrocarbon whose general formula is CnH2n (6)

> Answer: Alkene
*Explanation:* General formula for alkenes is CₙH₂ₙ — e.g., ethene (C₂H₄).

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[10] Separation of a liquid from a mixture by evaporation followed by condensation (12)

> Answer: Distillation
*Explanation:* Classic separation technique — used to purify liquids or separate components by boiling point.

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[11] Describes a hydrocarbon with only single bonds between its carbon atoms (9)

> Answer: Saturated
*Explanation:* Alkanes have only C–C single bonds → saturated hydrocarbons.

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[12] A substance made by very large molecules made up of many repeating units (7)

> Answer: Polymer
*Explanation:* Polymers (like polyethylene) are macromolecules formed from repeating monomers.

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## 🧩 DOWN CLUES

[1] The reaction used in the oil industry to break down large hydrocarbons into smaller, more useful ones (6)

> Answer: Cracking
*Explanation:* Thermal or catalytic cracking breaks long-chain hydrocarbons into shorter, more valuable ones (e.g., gasoline).

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[2] Saturated hydrocarbon with general formula CnH2n+2 (6)

> Answer: Alkane
*Explanation:* Methane (CH₄), ethane (C₂H₆), etc. — all follow CₙH₂ₙ₊₂.

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[3] The reaction in which the enzymes in yeast turn glucose into ethanol and carbon dioxide (12)

> Answer: Fermentation
*Explanation:* Yeast ferments glucose → ethanol + CO₂ (used in brewing/baking).

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[5] A compound containing only hydrogen and carbon (11)

> Answer: Hydrocarbon
*Explanation:* Organic compounds made solely of H and C — basis of fossil fuels.

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[7] Small reactive molecules that react together in repeating sequences to form a very large molecule (a polymer) (8)

> Answer: Monomer
*Explanation:* Building blocks of polymers — e.g., ethene → polyethene.

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[8] The resistance of a liquid to flowing or pouring; a liquid’s ‘thickness’ (9)

> Answer: Viscosity
*Explanation:* Measures fluid “thickness” — honey has high viscosity, water low.

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[10] ___ bond is a covalent bond made by the sharing of two pairs of electrons (6,4)

> Answer: Double bond
*Explanation:* A double bond (C=C) involves sharing 2 pairs (4 electrons total). Clue says “(6,4)” — likely meaning 6 letters + 4 letters? But “Double bond” is 6 + 4 = 10 characters including space? Actually, it’s probably just “Double bond” as the phrase. Sometimes crosswords use hyphens or spaces — but here, it fits as “Double bond”.

Wait — let’s check length:
“Double bond” = 6 letters (“Double”) + 1 space + 4 letters (“bond”) → fits clue (6,4) if interpreted as “6-letter word + 4-letter word”. Perfect!

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## ✔ Final Answers Summary:

Across:

- [3] FRACTIONS
- [4] FLAMMABLE
- [6] UNSATURATED
- [9] ALKENE
- [10] DISTILLATION
- [11] SATURATED
- [12] POLYMER

Down:

- [1] CRACKING
- [2] ALKANE
- [3] FERMENTATION
- [5] HYDROCARBON
- [7] MONOMER
- [8] VISCOSITY
- [10] DOUBLE BOND

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## 🧪 Bonus: Image Context

You mentioned an image with a test tube over a Bunsen burner — this likely illustrates distillation or cracking, both common lab processes in organic chemistry. The flame suggests heating, which is essential in these reactions.

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Let me know if you’d like me to draw the filled grid or help visualize how the answers fit into the crossword layout!