Word Equations worksheet - Free Printable

Here is the solution to the “Word Equations” worksheet. Each question describes a chemical reaction in words, and you need to write the word equation by placing the correct reactants (on the left) and products (on the right) of the reaction into the boxes.

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✔ 1. Carbon monoxide reacts with Oxygen to give Carbon dioxide.

This is a combustion reaction.

Word Equation:
> Carbon monoxide + Oxygen → Carbon dioxide

✔️ Fill the boxes:
- Left box 1: Carbon monoxide
- Left box 2: Oxygen
- Right box: Carbon dioxide

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✔ 2. Nitrogen oxides reacts with Water of the air to form Nitric acid.

This is how acid rain forms — nitrogen oxides (like NO₂) react with water vapor.

Word Equation:
> Nitrogen oxides + Water → Nitric acid

✔️ Fill the boxes:
- Left box 1: Nitrogen oxides
- Left box 2: Water
- Right box: Nitric acid

*(Note: “Water of the air” just means water vapor or atmospheric water — so “Water” is sufficient for this level.)*

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✔ 3. Glucose ferments into Ethanol and Carbon dioxide.

This is alcoholic fermentation — done by yeast.

Word Equation:
> Glucose → Ethanol + Carbon dioxide

✔️ Fill the boxes:
- Left box: Glucose
- Right box 1: Ethanol
- Right box 2: Carbon dioxide

*(Note: Fermentation doesn’t require an added reactant — glucose breaks down on its own with enzymes. So only one reactant.)*

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✔ 4. Butane burns in excess Oxygen to produce Carbon dioxide and Water vapor.

This is complete combustion of a hydrocarbon.

Word Equation:
> Butane + Oxygen → Carbon dioxide + Water vapor

✔️ Fill the boxes:
- Left box 1: Butane
- Left box 2: Oxygen
- Right box 1: Carbon dioxide
- Right box 2: Water vapor

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✔ 5. Calcium carbonate reacts with Hydrochloric acid to give Calcium chloride, Water and Carbon dioxide.

This is a classic acid + carbonate reaction (e.g., vinegar + baking soda type, but with HCl).

Word Equation:
> Calcium carbonate + Hydrochloric acid → Calcium chloride + Water + Carbon dioxide

✔️ Fill the boxes:
- Left box 1: Calcium carbonate
- Left box 2: Hydrochloric acid
- Right box 1: Calcium chloride
- Right box 2: Water
- Right box 3: Carbon dioxide

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## 📝 Final Answer Summary:

1.
Carbon monoxide + Oxygen → Carbon dioxide

2.
Nitrogen oxides + Water → Nitric acid

3.
Glucose → Ethanol + Carbon dioxide

4.
Butane + Oxygen → Carbon dioxide + Water vapor

5.
Calcium carbonate + Hydrochloric acid → Calcium chloride + Water + Carbon dioxide

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✔ These are all correctly balanced word equations — no need for chemical formulas or balancing numbers at this grade level. Just matching the names as described!

Let me know if you’d like the chemical formulas too!