Tuesday, March 24Pick up a notes slip and glue it

into your comp book

Take out your packet and open to pages 6-7. Review the information on these pages to preview what you are learning today.

Brainpop Video Clip: Chemical Bonding

While watching, think about bonding and the two main types (ionic and covalent). Have your yellow notes slip open in your comp book for after the video clip.

Feel free to jot down notes/ideas under your notes slip during the video.

After the Video, Round Robin share with your team one thing you learned from the video until you run out of things to share.

Ionic and Covalent Bonding Notes

Stable or Unstable?An atom is only stable if it has a full valence shell

If an atom is stable, it will not bond

If an atom is not full, it will bond

Compounds Compounds are formed when 2 atoms of

different elements bond together.

Atoms bond to fill their valence shell

An atom will bond with an many atoms as it takes to fill its outer shell

Once the valence shell is full, that atom is stable

Types of Chemical Bonds There are two types of chemical bonds:

1. Ionic Bonds2.Covalent Bonds

Ionic BondsIonic bonds exist between a non-metal and a metal

When two atoms bond ionically, they gain/lose electrons

When an atom gains or loses an electron, it becomes an ion (an atom with a positive or negative electrical charge)

IonsGroup 1

18

213

14

15

16

17

3 4 5 6 7 8 910

11

12

Calcium is in group 2.

How many valence electrons does it have?

It has 2 valence electrons.

How many does it need to be stable?

8…so it can either lose 2 or gain 6. Which is easier?

Losing 2…if it loses 2 electrons, it becomes positive

Which other elements would lose 2 electrons?

IonsGroup 1

18

213

14

15

16

17

3 4 5 6 7 8 910

11

12

Types of Ions

Cation Positive Metals loses/gives away valence

electrons)

Anion Negative Nonmetals gain/take valence

electrons)

CationPositive ion (a metal gives away electrons in ionic bonding and becomes positively charged)

AnionNegative ion (a nonmetal takes electrons in ionic bonding and becomes negatively charged)

Covalent BondsCovalent bonds exist between NONMETAL and NONMETAL.Example: H2, H2O, NO3, CH4

Covalent bonds SHARE electrons.

Shared electrons don’t belong to either atom.

Covalent Bond (2 non-metals)

Lewis Dot Diagram Review

Draw the valence electrons up to 8! Then show the bonding.Write the charges/ions for ionic bonds.

CH4

Writing Chemical Formulas – Ionic Bond

The cation (metal) is always written first in the formula, like Sodium in Sodium Chloride (NaCl)

Write the ion charges Cross them down and write them as a

subscript

Al3+ O2–

Al2O3

In order for ionic compounds to be electronically neutral, the sum of the charges on the cation and anion in each formula must be zero.

Aluminum oxide:

Sum of charges: 2(+3) + 3(–2) = 0

Formulas of Ionic CompoundsFormulas of Ionic Compounds

To Do:Complete the “Bonding Basics” practice

in your packet. 1. Draw the bonds, as specified2. Write the chemical formula for each

compound3. Extra Challenge: Follow the instructions in

your packet to try and write the correct names for each compound.

* Have Ms. Wasson check when finished

If finished early, start reading about Acids and Bases on the next page in your packet and READ pages 214-217 in your textbook. Then start answering the Acid and Base questions in your packet.