October 1st

For Friday, October 1st
1. Hand-in Lab-report on 2C
2. To add on to the matter notes, new notes: Law of Definite Composition, Law of Multiple Proportions.

Law of Definite Composition:
-Compounds will have a definite composition.
Ex. H2O will be H2O anywhere. (always have 2H and 1 O)

Law of Multiple Proportions:
-when 2 or more compounds with different proportions of the same elements can be made.
Ex. CO2 (carbon dioxide) -> C2O4 ( dicarbon tetraoxide/oxalate)

3. Also, we also copied The Heating/Cooling Curve of a Pure Substance notes

• A. - solid state at any temperature below its melting point. Particles closely packed together. Since forces between particles are very strong, can only vibrate at FIXED position.
• A-B. - as it's heated, heat energy converted to kinetic energy. Kinetic energy increases; molecules vibrate faster about their fixed positions; temperature increases.
• B. -still solid (melting just beginning-solid begins to change into liquid); temperature remains same.
• B-C. -exist in both solid and liquid states; temperature remains constant b/c heat applied to it is used to over the force of attraction.  Constant temperature= melting point. The heat energy that absorbed to overcome the intermolecular forces named Latent Heat of Fusion.
• C.- solid has completely melted into liquid.
• C-D.- It's in the liquid state. As liquid heats, molecules gain more heat energy and temperture continues to increase. Particles moves faster and faster because kinetic energy is increasing.
• D- exists in liquid state. Molecules have received enough energy to overcome the forces of attraction. Some molecules atart to move freely and liquid began to change into gas.
• D-E.- Exists in both liquids and gaseous state where temperture remains unchanged. Heat energy overcome intermolecular forces instead of increasing temperature. This constant temperature is boiling point.
• E- All the liquid turn into gas.
• E-F. - Gas particles continue to absorb more energy and move faster. Temperature increases as heating continues.

The notes will help with the experiment that we will conduct next class under the same name: Experiment 2B in your lab book.

4. The homework is a) to prepare a lab procedure flowchart b) Pre-lab write up for Experiment 2B.

Extras:

All About Pure Substances!

^ A webpage explaining in detail what pure substances are. Colourful, and easy to read. :)