Study Notes from Class Discussion
Homework Assignments
Due Date: Thursday night at 11:59 PM
Assignments:
EDA (Entry Verification Assignment)
Location on Blackboard: Under the "Start Here" section, accessible using the green button.
Graded Problem Set (Grade 8 PS 1)
Location on Blackboard: Under Module One
Note: This is the only assignment not due this week, specifically not due is the EBA.
Key for Module One Problems
Visibility: The answer key will be available at 1 AM on the 23rd, one hour after the module one problem set closes.
Upcoming Test
Date: Next week on Tuesday, the 27th.
Content: The test will cover Module One.
Test Format: Multiple choice.
Note Card Policy:
Students are allowed to bring a 3x5 inch note card.
Content: Anything written on it is permitted. Typed notes can be submitted.
Restrictions: A laminated periodic table will be provided, but students cannot bring their own.
Other restrictions include avoiding multi-layer or post-it note attachments.
Study Aids
Study Guide:
There will not be a separate study guide. The graded problem set and the Elements Lab serve as the best study materials for this test.
An answer key for the Elements Lab will also be provided.
Test Structure:
The number of multiple-choice questions is unspecified, but the instructor may shorten previous tests to fit a 50-minute time limit.
Additional credit may be offered on the test.
Reading Assignments
Grading: There are no grades assigned to readings; they correspond to the content of the module.
Location on Blackboard: Find the laboratory section visually marked with a picture.
Essential documents: Two documents inside:
Safety documents.
Scheduling procedures containing a table of dates and experiments.
Chemical Reactions Demonstrations
Reaction Overview:
Water reactivity with metals is the primary focus.
Specific metals tested include:
Lithium
Sodium
Potassium
Rubidium
Controlled Experiment:
Equal quantities of metals are used in each reaction with a fixed amount of water (10 mL).
Initial treatment of metals under argon to prevent reactions with air.
Observations from Reactivity Test:
Lithium Reaction:
Reactive with water producing hydrogen gas, represented by the general chemical reaction:
Sodium Reaction:
More vigorous than lithium; characterized by fires and color changes indicative of energetic reactions.
Potassium Reaction:
Even more vigorous than sodium, exhibiting explosive characteristics immediately upon contact with water.
Rubidium Reaction:
Demonstration included noting the controlled nature of experiments and the usage of identical amounts of metal in each test.
Chemical Bonds
Bond Types: There are three primary types of chemical bonds: ionic, covalent, and metallic.
Ionic Bonds:
Definition: A type of bond formed when one atom transfers an electron to another, often resulting from metals bonding with nonmetals.
Conceptual Visualization: Can be illustrated using cartoons where one atom gives an electron to another.
Covalent Bonds:
Definition: Formed when two nonmetals share electrons.
Characteristic: Bonds involve mutual sharing rather than transferring electrons entirely.
Metallic Bonds:
Definition: Occur among metal atoms where electrons are not associated with a specific atom (referred to as the “sea of electrons”).
Characteristics:
Allows for conductivity of electricity and thermal energy as electrons can move freely, resulting in good conductivity properties in metals.
Summary of Key Chemical Equations
All metal-water reactions can be summarized by the equation:
(where specific metals result in varying reactivity levels).Examples of bonds with their associating definitions and illustrations relevant to chemical structures and properties.