question of the day how are ionic and covalent bonds different? 9-23

Question of the DayHow are ionic and covalent bonds

different?

9-23

Explain the formation of compounds (ionic + covalent) and their resulting properties using bonding theories.

Objective9-23

Question of the Day9-24

Get out your POE from yesterday (lab paper). Were there any substances that surprised you (there should probably be at least one)?

Explain the formation of compounds (ionic + covalent) and their resulting properties using bonding theories.

Objective9-24

ExplainWater # 1

Water # 2

Salt water

Sugar water

Vegetable Oil

Names __________________

________________________

Come up with an explanation for why the two water samples may have been so different.

When ionic compounds are dissolved in water they break apart into ions what two ions is the salt break apart into (include charges)?

We will come back to these two later leave them blank for now.

Page 34 #s 1-8

My.hrw.comPage 34 #s 1-8

Allan Smith

15

Kamil Kolkowski

9

Natalie Gilbert

Robert Riffel

Justin Smigley

10

Ali Smith

11

Matthew Rivera

14

Alexandria Clowney

12

Vincent Farber

6

Ryan Freeman

13

Victoria Jurjevic

8

James Harkness

8

Kyle Watson

7

Mariangely Onativia

2

Thomas Sinner

Nicole Deluca

Kenneth Charlot

3

Evan McSwegan

4

Christopher Cayo

5

Elizabeth Buzzard

5

1st period is all the way done with 1-8 but second period finished it for hwk and needs to go over it.

Covalent bonds can be __________ or ___________.

Question of the Day9-27

Compare and contrast different bond types that result in the formation of molecules and compounds.

Objective9-27

Nonpolar Covalent bond - bonding electrons are shared equally by bonded atoms

Polar Covalent bond - bonding electrons are shared unequally by bonded atoms

Covalent bonds can be polar or nonpolar

Ionic bonds

Polar Covalent

bonds

Nonpolar

Covalent bonds

Transfer elecs.

Share elecs.

What is the difference between polar and nonpolar covalent bonds?polar

Moving in the ionic direction

Atoms attract shared electrons unequally

nonpolar

Purely covalent

Atoms attract shared electrons equally

The Fight for Electrons – bonding as a tug-of-war

H H

HBr

TieCovalent

Polar Covalent

NaCl Ionic

The Fight for Electrons – bonding as a tug-of-war

Bonds are purely covalent when …

Quick TalkNeutron

Ionic bond

Mass number

Octet rule

Biosphere

Valence electrons

Atomic number

Covalent bond

Proton

Biotic factor

Penn State

Water contains __________ bonds.

Question of the Day9-28

Describe how the unique properties of water support life on Earth.     

Objective9-28

READ pages 39-44 AND complete #s 1-8 of the section

review on page 44

• Polarity –– When a molecule has an uneven distribution of charge

(unequal electron sharing

• Water - – Oxygen doesn’t share the electrons equally with

hydrogen– So if the oxygen pulls the electrons closer, the oxygen

then becomes partially negative, and the hydrogen will become partially positive.

– Draw a water molecule:

Hydrogen Bonding

OH

H(-)

(+)

OH

H(-)

(+)

O H

H

(-) (+)

(+)(+) (+)

Bonds• Hydrogen Bonds –– A hydrogen bond is the force of attraction

between a hydrogen molecule with a partial positive charge and another atom or molecule with a partial or full negative charge.

– Weak attraction between the partially negative oxygen and partially positive hydrogen

– This is what gives water some VERY IMPORTANT qualities

Important Qualities of Water– Surface Tension:

• Created by hydrogen bonds – the water is able to resists force of objects -- water “sticks” to itself

– Which is more dense, water or metal?• Metal

– Floating paper clip?!?! Why???• Metal, but paperclip floats b/c water is weakly

bonded and those bonds are not breaking.

Molecule – group of atoms united by covalent bonds (molecules = molecular substance)

FORMULAS

Chemical- How many atoms of each element

Structural - How atoms are bonded together