HOMEWORK: The Octet Rule and Its Exceptions

While Lewis electron dot structures help determine bonding in most compounds, there are three general exceptions:

  1.  molecules in which atoms have fewer than 8 electrons (e.g., boron chloride and lighter s- and p- block elements)
  2.  molecules in which atoms have more than 8 electrons (.e.g, sulfur hexafluoride and elements beyond period 3)
  3.  molecules with an odd number of electrons (e.g., NO).

– chemistry.about.comoctect rule.jpg

In your notebooks explain/expand each of the aforementioned exceptions to the octet rule and provide an example for each.

DUE DATE:  Friday 24th

 ( just leave your notebooks on my desk when you come in before or after flag ceremony)

 

Introduction to Ionic and Covalent Bonding

A chemical bond is a force of attraction between atoms that share or transfer electrons. When atoms of different elements bond together, they form a chemical compound, which is a new substance with a fixed ratio of elements. Types of bonds include ionic, covalent, and metallic bonds. The different types of bonds form compounds that have different properties.

– ck12.org

cool-cartoon-3067342.png

We will be learning about ionic, covalent, and metallic bonding during the next few weeks.We will start with ionic bonding and then go on to covalent bonding. Watch the video in the link below and take notes if necessary, it should illustrate and help your understanding of the first two types of bonds.

http://www.schooltube.com/video/7870b1153b034ec08d7a/

QUIZ REVIEW

For quiz  review the following terms:

  • Electron dot structure
  • Alkali metals
  • Alkali earth metals
  • Transition elements
  • Atomic radius
  • Ion
  • Ionization energy
  • Electron affinity
  • Cation
  • Anion
  • Electro negativity
  • Period trends
  • Group trends

QUIZ DATE: Fri.17th

 

 

STAGE 3: ACTION!!

science quote.jpg

So far we’ve successfully completed 2 stages of our science fair. It is now time to take action!!

Like stated previously, this is the hands on stage where you follow your timeline, investigation plan and investigate, experiment, collect data, and have the most fun!!   Many of you have already started and are on the right track  🙂

Remember that all parts of your action plan must be thoroughly investigated, documented and then added to your research paper. At the end of this stage you will submit your completed research paper which must be composed of:

  • Introduction that ends with a detailed hypothesis.
  • Global and local information regarding your chosen topic with citations.
  • Similar experiments/research regarding your chosen topic with citations.
  • Importance of researching your topic globally or locally with citations.
  • Explanation of why your group is interested in this topic.
  • Analysis of the problem or research question.
  • Details of all actions taken during research or of experiments ( include pictures of yourself in action for illustration purposes)
  • Results in graphs, charts, and/or written details.
  • Conclusion. Written coherently and based on the recollected data and results.
  • Analysis that explains the limitations that your research may have had and what the group would do differently or change during a future investigation or experiment.

DUE DATE OF COMPLETED STAGE 3:  MARCH 10th

Periodic Trends and Atomic Radius Review

For this review you will use the information provided below and do the following:

  1. Organize the information in a chart.
  2. Make an atomic radius vs atomic number graph. ( Make sure to label your Y and X axis correctly and give your graph an appropriate title.)

Information:

  • sunflower orbitals.jpgHydrogen, 1 proton, atomic radius 37 picometers
  • Helium, 2 protons, atomic radius 32 picometers
  • Lithium, 3 protons, atomic radius 152 picometers
  • Beryllium, 4 protons, atomic radius  111 picometers
  • Boron, 5 protons,atomic radius 88 picometers
  • Carbon, 6 protons, atomic radius 77 picometers
  • Nitrogen, 7 protons, atomic radius 70 picometers
  • Oxygen, 8 protons, atomic radius 66 picometers
  • Fluorine, 9 protons, atomic radius 64 picometers
  • Neon, 10 protons, atomic radius 70 picometers
  • Sodium, 11 protons, atomic radius 186 picometers
  • Magnesium, 12 protons, atomic radius 160 picometers
  • Aluminum, 13 protons, atomic radius 143 picometers
  • Silicon, 14 protons, atomic radius 143 picometers
  • Phosphorus, 15 protons, atomic radius 110 picometers
  • Sulfur, 16 protons, atomic radius 104 picometers
  • Chlorine, 17 protons, atomic radius 99 picometers
  • Argon, 18 protons, atomic radius 94 picometers

DUE: MONDAY FEB. 13th – There will be a second part to this homework in the class
room, so make sure to complete this part and bring it in.
🙂

 

January Project/Periodicity

For this month our project will require understanding of the celement character.jpgconcept we’ve been studying and also great creativity.

Your group projects must include the following:

  • 15 spaces or blocks on your display.
  • 4 or more trends among the 15 spaces or blocks.
  • Index cards or small squares of paper that explain the periodicity of your display.
  • Group oral presentation.