| Potassium + Water | ✔ | | Fizz! It makes potassium hydroxide + hydrogen gas. |
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| Gold + Water | | ✔ | No fizz: nothing happens. |
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| Magnesium + Hydrochloric Acid | ✔ | | Fizz! It makes magnesium chloride + hydrogen gas. |
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| Copper + Hydrochloric Acid | | ✔ | No fizz: nothing happens. |
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| Calcium + Water | ✔ | | Fizz! It makes calcium hydroxide + hydrogen gas. |
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| Helium + Oxygen | | ✔ | No fizz: nothing happens. |
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| Zinc + Hydrochloric Acid | ✔ | | Fizz! It makes zinc chloride + hydrogen gas. |
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| Silver + Water | | ✔ | No fizz: nothing happens. |
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| Iron + Hydrochloric Acid | ✔ | | Fizz! It makes iron(ii) chloride + hydrogen gas. |
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| Silver + Hydrochloric Acid | | ✔ | No fizz: nothing happens. |
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