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VICChemistryQuick questions

Unit 2: How do chemical reactions shape the natural world?

Quick questions on Writing ionic and net ionic equations for aqueous reactions: VCE Chemistry Unit 2

8short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.

What is checking your work?
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Two checks for every net ionic equation:
What is precipitation?
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Two soluble salts are mixed and an insoluble product forms. Swap the partners and check solubility rules. Example: Pb(NO3)2(aq)+2KI(aq)→PbI2(s)+2KNO3(aq)Pb(NO_3)_2(aq) + 2KI(aq) \to PbI_2(s) + 2KNO_3(aq) gives the net ionic equation Pb2+(aq)+2I−(aq)→PbI2(s)Pb^{2+}(aq) + 2I^-(aq) \to PbI_2(s).
What is acid-base neutralisation?
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A strong acid plus a strong base in stoichiometric amount gives a salt and water. The net ionic equation collapses to:
What is metal displacement?
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A more reactive metal displaces a less reactive one from its salt. Net ionic equations show only the metal and the ion that changes:
What is wrong state symbols on the precipitate?
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AgClAgCl, PbI2PbI_2 and BaSO4BaSO_4 are insoluble; mark them (s)(s). NaNO3NaNO_3, KClKCl and most other group 1 salts are (aq)(aq).
What is q1?
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Write the net ionic equation when aqueous silver nitrate is mixed with aqueous sodium chloride. State the spectator ions. [2 marks]
What is q2?
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25.0 mL25.0 \, \text{mL} of 0.100 mol/L0.100 \, \text{mol/L} Pb(NO3)2\text{Pb(NO}_3)_2 is mixed with 25.0 mL25.0 \, \text{mL} of 0.300 mol/L0.300 \, \text{mol/L} KI\text{KI}. (a) Write the net ionic equation. (b) Calculate the mass of precipitate.
What is q3?
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Consider the reaction of dilute HCl\text{HCl} with solid CaCO3\text{CaCO}_3. (a) Write the full balanced equation. (b) Write the net ionic equation.

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