1. How is a compound different from the elements that make it up?

2. BIC BONDS
Considering what we’ve learned about the strength involved and energy needed to hold electrons in place, can you make an analogy to the bond you have in relationship to Christ?
How is it like the electrons? How is it different?
Romans 8:39 neither height nor depth, nor anything else in all creation, will be able to separate us from the love of God that is in Christ Jesus our Lord.

3. Covalent Bonds
Sharing Electrons
A hydrogen atom has one electron. How many would it take to have the same electron configuration as a helium atom?____________
2. Two hydrogen atoms can achieve a stable electron configuration by sharing their valence electrons and forming a covalent bond.

4. Covalent Bonds
3.This illustration shows four ways to represent a covalent bond between two hydrogen atoms.
As a space shuttle lifts off, it leaves a water vapor trail. A reaction of hydrogen and oxygen produces the water.

5. Covalent Bonds
Molecules of Elements
Two hydrogen atoms bonded together form a unit called a molecule.
A molecule is a neutral group of atoms that are joined together by one or more covalent bonds.
A compound formed from many covalent bonds is called a covalent compound .

6. 4. Atoms with less than eight valence electrons become chemically stable by forming a chemical bond.
Lesson 2-2

7. Covalent Bonds—Electron Sharing
5. A single covalent bond exists when two atoms share one pair of valence electrons. H-H
A double covalent bond exists when two atoms share two pairs of valence electrons
A triple covalent bond exists when two atoms share three pairs of valence electrons.
Lesson 2-2

8. 8. A molecule is a group of atoms held together by covalent bonding that acts as an independent unit.
9. A molecule that has a partial positive end and a partial negative end because of unequal sharing of electrons is a polar molecule.
Lesson 2-3

9. Covalent Compounds
10. What are some common properties of covalent compounds?
form stable covalent compound.
have low melting points and low boiling points.
are usually gases or liquids at room temperature, some exceptions are solids.
are poor conductors of thermal energy and electricity.
Lesson 2-3

10. 11. Atoms of a polar molecule share their valence electrons unequally.
Lesson 2-4

11. 12. Atoms of a nonpolar molecule share their valence electrons equally.
Lesson 2-4

13. Which one is polar? Why?.

15. Covalent Compounds (cont.)
chemical formula symbols and numbers that represent the elements & number of atoms of each element that make up a compound.
it does not explain the shape or appearance of the molecule.
Atomic symbol = atom= element
Chemical formula = molecule= compound
Lesson 2-3

16. Which term refers to chemical combinations of different types of atoms?
A. covalent bond
B. chemical formula
C. compound
D. polar molecule
Lesson 2 – LR1

17. When two atoms share one pair of valence electrons, which of the following exists?
A. single covalent bond
B. double covalent bond
C. triple covalent bond
D. none of these
Lesson 2 – LR2

18. Which term refers to a molecule that has a partial positive end and a partial negative end because of unequal sharing of electrons?
A. covalent bond
B. polar molecule
C. nonpolar molecule
D. covalent compound
Lesson 2 – LR3