Day 76Intermolecular ForcesCheck for Understanding Revisit

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

6 minutes

5 minutes

4 minutes

3 minutes

2 minutes

1 minute

STOP

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?

Open to the next available page

•Cornell Notes: Intermolecular and Intramolecular Forces

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

Summary of Results

Question

Why are some substances able to dissolve in water, while others can’t?

Sodium ChlorideEthanol

Water

Sucrose

+

Reasoning

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

Summary of Results

Question

Why do some substances or solutions conduct electricity, while others won’t?

Reasoning

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

Notebook CheckDO: Trade your notebook with a table partnerPUT: Your name and partner at the topSCORE: Your partner’s notebook and count and cross out all signatures/stamps

TIME: 6 minutes

WHEN DONE: Turn in Notebook Check sheet into class box