Class Blog 1/21/14

Welcome back Period 4!!

Mr. Lieberman's special announcement:

We have a special next year thanks to the block schedule...

Since we will have another period, it is possible to take AP Chemistry along with physics!

This will begin to open doors for those who are interested in studying science.

But keep in mind...

The leap from honors chemistry to honors physics is HUGE. Honors physics is very independent and fast paced.

So make sure when you are considering honors think about:

priorities

scheduling

TIME

Mrs. Friedmann will ask us to write down course preferences regarding next year tomorrow in class.

We picked up five handouts- available in Unit 7 Handouts folder.

INTRO TO IONIC BONDING

Mrs. Friedmann's class notes are on moodle!

Ionic Bonds:

Bonds→ glue that sticks atoms together to form compounds

There are several kinds.. one kind is ionic

We already know how to...  

write ionic formulas (i.e. NaCl)

write names of ionic compounds (i.e. sodium chloride)

Ionic bond- one that occurs between a METAL and a NONMETAL.

METALS: form cations (positive)

NONMETALS: form anions (negative)

*there is a TRANSFER of electrons from the metals to the nonmetals

metals always lose electrons

nonmetals gain the electrons that metals lost

Keep in mind...

octet rule: full s and p orbitals in the highest energy level

Example:

Na (1s22s22p63s1)

more stable if it loses an 1 electron

easier to get rid of 1 electron rather than gain 7

...it is picked up by another element

Cl (1s22s22p63s23p5)

more stable if it gains 1 electron

Na- neutral when it has 1 valence electron

Cl- neutral when it has 7 valence electrons

⇒ Na with a positive charge and Cl with a negative charge forms a perfect octet

now we have a positive and negative particle (they attract each other)

--> they stick to each other (ionic bond)

Ionic bond is the electrostatic attraction between a cation and an anion

Homework: 

1) finish 2 worksheets we picked up in class titled "Intro to Ionic Bonding"

2) Chemthink: ionic bonding (we already completed)

tutorial and questions (do not have to take notes in journal)

The next scribe is Danny Schiller.