Molecules & Solutions

Here is a list of the objectives that we covered in the second unit. You are expected to be able to:

  • Define the concept of solubility
  • Describe the effect of variations in temperature on the solubility of a substance – DONE IN SOLUBILITY LAB
  • Determine the concentration of an aqueous solution (g/L, percentage, ppm, mol/L)
  • Define the concept of electrolyte
  • Qualitatively speaking, associates the strength of an electrolyte with its degree of dissociation
  • Describes the mechanism that allows aqueous solutions to conduct electricity (electrolytic dissolution of a solute, formation of mobile ions)
  • Describes the pH scale (acidity, alkalinity, neutrality, increasing and decreasing values)
  • Determines the pH of a few common substances (e.g. distilled water, rainwater, saliva, lemon juice, cleaners) – DONE IN pH LAB
  • Defines the concept of ion
  • Explains dissolution using the particle model
  • Explains dilution in terms of concentration and volume
  • Determines the final volume or concentration of an aqueous solution after dilution (e.g. the concentration of a solution decreases by half when the volume of solvent is doubled)
  • Defines a covalent bond as a bond resulting from a sharing of electrons
  • Makes a schematic representation of a covalent bond
  • Identifies molecules that feature a covalent bond (e.g. N2, CO2)
  • Defines an ionic bond as a bond resulting from the gain or loss of electrons
  • Makes a schematic representation of an ionic bond
  • Identifies molecules that present an ionic bond (e.g. NaCl, NH4OH)
  • Associates an ionic bond with an electrolytic substance
  • Applies nomenclature and notation rules to name the molecule or write the molecular formula of binary compounds
  • Recognizes the common polyatomic ions (e.g. NH4 , OH , NO3, CO3 , SO4 , PO4 ) by their name, their formula or their composition

Wow…that is quite a list! You can use this as a checklist while you are studying.¬†We will be focussing on the ones in red for next week’s test.

I’ve put together a practice test (Sakai Resources > Classwork > Molecules and Solutions. Please use the Practice Test VoiceThread¬†(see the VoiceThread menu in Sakai) to share your answers with others or to ask questions as they come up. I will post the answer key on Wednesday.