How Do Compounds Form?

1
How Do Compounds Form?

• Rob Green

2
Making Molecules

• Come to the front and get one kit per two
  students.
• Get a white board and marker.
• We will construct and draw the models.

3
Chemistry

• What are the 4 main signs of chemical change?
• Gas
• Light
• Heat
• Odor

4
Chemistry

• What are changes of state?
• What causes a substance to undergo a change of
  state?

5
Chemistry

• What happens when a chemical change occurs?
• If a substance is broken into pieces, why is this
  a physical change?

6
Chemistry

• What is an ionic bond? How is it formed?
• What is a covalent bond? How is it formed?

7
Chemistry

• Why do compounds form?
• What must occur for Na Cl to bond?
• How stable is a N2 molecule?

8
Chemistry

• 1. What type of compounds form salts?
• 2. What type of compounds form molecules?
• 3. Which conducts electricity? Explain.

9
Chemistry

• 1. What controls the chemistry of an atom?

10
Electron's Influence

• What are the number of electrons in the outer
  shell?
• What configuration does this resemble?

11
Chemistry

• 1. What does the Roman numeral tell you?
• 2. Which ion is written first?
• 3. How do you indicate multiple polyatomic ions?

12
Making Molecules

• Come to the front and get one kit per two
  students.
• Get a white board and marker.
• We will construct and draw the models.

13
Electrons Influence

• Look at the following on your periodic table.
• Na.
• K.
• Mg.
• O.
• Cl.
• F.

14
Representing Electrons

• Lewis dot structures show the electrons involved
  in bonding.

15
Lewis Dot Structures

• Sodium has 1 electron.
• It usually will loose it.
• Leaving with a positive charge.
• Na

Na
16
Practice

• Look at the rest of the atoms draw their Lewis
  dot structures.
• K F
• Mg Cl
• O

17
Answers

• K
• Mg
• O
• Cl
• F

18
How Do the Ions Form?

• What happens during an ionic bond?
• Look at the notes for.
• 1-3 electrons.
• 5-8 electrons.
• 4 electrons.

19
Where Do the Electrons Go?

• Electronegativity drives ionic bonds.
• Na Cl Na Cl-.

20
Formulas

• Hydrogen and sulfur

21
Formulas

• Magnesium and fluorine

22
Formulas

• Hydrogen and oxygen

23
Formulas

• Calcium and oxygen

24
Formulas

• Sodium and phosphorus

25
Formulas Polyatomic Ions

• Sodium and hydroxide

26
Formulas Polyatomic Ions

• Potassium and sulfate

27
Formulas Polyatomic Ions

• Magnesium and phosphate

28
Formulas Polyatomic Ions

• Aluminum and carbonate