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VICChemistryQuick questions
Unit 2: How do chemical reactions shape the natural world?
Quick questions on Properties of water, dissolving and precipitation: VCE Chemistry Unit 2
6short 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 are solubility rules?Show answer
A workable VCE-level set of solubility rules for ionic compounds in water:
What are ionic compounds?Show answer
When an ionic solid (e.g. NaCl) is added to water, the dipoles of water orient around the ions. The partial negative O attracts cations (Na^+), the partial positive H atoms attract anions (Cl^-).
What are polar molecular substances?Show answer
Substances such as sugar, ethanol or ammonia dissolve in water because they can hydrogen bond (or at least form dipole-dipole interactions) with water. They do not dissociate into ions; they dissolve as intact molecules.
What is q1?Show answer
State two unusual physical properties of water and link each to hydrogen bonding. [4 marks]
What is q2?Show answer
Predict whether a precipitate will form when aqueous is added to . (a) Apply solubility rules. (b) Write the net ionic equation.
What is q3?Show answer
A bath of water cools from to . (a) Calculate the energy released. (b) Explain why this is more than would be released by the same mass of ethanol.
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