What is always produced when a metal reacts with an acid?, A. Oxygen, B. Hydrogen, C. Carbon dioxide, D. Nitrogen, What type of reaction is magnesium + hydrochloric acid?, A. Endothermic, B. Exothermic, C. Neutral, D. Combustion, What is the salt formed when magnesium reacts with hydrochloric acid?, A. Magnesium sulfate, B. Magnesium nitrate, C. Magnesium chloride, D. Magnesium oxide, Which observation shows a reaction is happening?, A. Freezing, B. Colour disappears, C. Fizzing (bubbles), D. No change

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