Day 76 Intermolecular Forces Check 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

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STOP

HOMEWORK – DUE NEXT CLASS

Take out (turn to) Data Table from Lab Physical Property Aluminum (Al) Wax (C 25 H 52 ) Sodium Chloride (NaCl) Stearic Acid (C 18 H 36 O 2 ) Sucrose (C 12 H 22 O 11 ) Water (H 2 O) Ethanol (C 2 H 6 O) Color and Appearance Conductivity Solubility in Water (H 2 O) Solubility in Hexane (C 6 H 14 ) Melting Point Boiling Point

As a table group: Melting Point DO: 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 = between Intra = 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: Solubility DO: 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 Chloride Ethanol Water Sucrose +

Reasoning

As a table group: Conductivity DO: 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: summary DO: Complete on a separate piece of paper TIME: 6 minutes WHEN DONE: Turn ONLY in your summary to the class box

Notebook Check DO: Trade your notebook with a table partner PUT: Your name and partner at the top SCORE: 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