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Warm Up•Find the Supporting Learning Targets in
Part 3 for Covalent Bonding•Make all three statements into questions
on a white board.•Then add them to your notes!
▫Work as a table group!
A covalent bond is anytime electrons are shared between non-metals
Non-metals all want to gain electrons, so instead of transfer (give away and steal), they SHARE electrons
Electrons are re-arranged so that they share pairs of electrons
Atoms always share the same amount- like a “potluck”
ADDITIONAL INFORMATION?
Covalent Bonding
Agenda•Review Covalent Notes•Check for Understanding Revisit•Intermolecular vs Intramolecular Forces
Notes•Properties of ionic, covalent, metallic
bonds•Notebook Check (if time)
Learning Target• Level 4 Target: I can explain how interactions at the
level of atoms, ions and molecules result in different properties in ionic, covalent and metallic substances
• LONG TERM TARGET: I can explain how ionic, covalent and metallic bonds are formed between atoms
• Part 5▫ I can describe what the following properties tell us about
a substance: melting point, boiling point, conductivity and solubility
▫ I can distinguish between intermolecular forces and chemical bonds
Check for Understanding Revisit
• DO: Read all of the statements and check if they are correct or a misconception (3 correct and 3 misconceptions)
• REWRITE: All misconceptions to be correct
• TIME: 6 minutes
• WHEN DONE: Make sure that your notebook is up to date and table of contents is filled in
HOMEWORK – DUE NEXT CLASS
• DO: Make corrections to your Check for Understanding▫See numbers above each section ▫The number means that you are
MISSING that supporting learning target
• USE: Check for Understanding Revisit and your notebook – website!
• DUE: Next Class ▫Bonding assessment end of next week
Take out (turn to) Data Table from LabPhysicalProperty
Aluminum(Al)
Wax(C25H52)
Sodium Chloride(NaCl)
Stearic Acid(C18H36O2)
Sucrose(C12H22O11)
Water(H2O)
Ethanol(C2H6O)
Color and Appearance
Conductivity
Solubility in Water (H2O)
Solubility in Hexane (C6H14)
Melting Point
Boiling Point
As a table group: Melting PointDO:• Write what substances had a
high melting point and which ones had a low melting point
• Identify is the substance is ionic, covalent or metallic
TIME: 4 minutes
WHEN DONE: put your assigned answer on the board
Summary of Results
•Covalent substances have a lower melting point than ionic and metallic substances.
Question
Are the intermolecular forces between molecules in covalent substances stronger or weaker than the bonds between ions in ionic substances, or the bonds between atoms in metals?
Inter = betweenIntra = within
Intermolecular forces: forces of attraction between molecules
Intramolecular forces: forces of attraction within atoms in a molecule
Intermolecular and Intramolecular Forces
Reasoning• Ionic and metallic bonds are stronger than
intermolecular forces between molecules in covalent substances.
• It takes more energy for the bonds to be broken with substances that have electrostatic forces than those with intermolecular forces.
• This is seen in our results because at 100 C aluminum (metallic) and NaCl (ionic) did not melt while all the other substances did (covalent).
• This means that the particles of metallic and ionic substances are held together with a stronger force than the particles in covalent molecules
As a table group: SolubilityDO:• Write what substances were
soluble and which substances were not
• Identify is the substance is ionic, polar covalent, non-polar covalent or metallic
TIME: 4 minutes
WHEN DONE: put your assigned answer on the board
As a table group: ConductivityDO:• Write what substances were
conductive and which ones were not
• Identify is the substance is ionic, covalent or metallic
TIME: 4 minutes
WHEN DONE: put your assigned answer on the board
As a table group: summaryDO: • Complete on a separate
piece of paper
TIME: 6 minutes
WHEN DONE: Turn ONLY in your summary to the class box