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.