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Chemical reactions answer explanations

Review worked answers and explanations for Chemical reactions. Aligned to OCR Gcse Combined Science A Gateway.

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Consider the following incomplete chemical reaction: CaCO₃(s) + 2HCl(aq) → CaCl₂(aq) + H₂O(l) + CO₂(g) (a) Identify the state symbol for calcium carbonate, CaCO₃. (b) Identify the state symbol for hydrochloric acid, HCl. (c) Describe the physical observations you would expect for carbon dioxide, CO₂, during this reaction. (d) Explain why calcium chloride is shown with the (aq) state symbol. [4 marks]

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