1. 11/18 & 11/19 - 8th Grade Agenda Learning Objective: Bonding in Metals
Collect HW: Reading & Notetaking: p.100 – 101
Video: Science Fair Project
Textbook Reading p
HW: Reading & Notetaking p.103 – 104
Reminder HW: Science Fair Topic due 12/2 & 12/3 (10 Points)

2. Daily Reflection
Prompt: Write difference between ionic and covalent bonds

3. Covalent Bond
Chemical bond formed when two atoms sha_____ electron is called a covalent bond.
Covalent bonds usually form between atoms of nonme_____
In contrast, ionic bonds form when metal and nonmetal combine re
tal

4. What is a Covalent Bond?
A chemical bond formed when two atoms share electrons is called a covalent bond

5. Examples of Covalent bonds

6. What are the characteristics of Molecular Compounds (Covalent Bonds)
Lower melting point that Ionic compounds
Lower boiling point that Ionic compounds
Poor conductors of electricity

7. What is a difference between an Ionic Bond and a Covalent Bond?
In an Ionic Bond, Chemical bond is formed by atoms loose electrons and becoming ions
In Covalent Bond, chemical bond is formed when atoms share electrons

8. Ionic vs Covalent Bond
Ionic Bond
Covalent Bond

9. Is Salt (NaCl) a Ionic or Covalent Bond?
Ionic Bond

10. Is Water a Ionic or Covalent Bond?

11. What are the characteristics of Molecular Compounds (Covalent Bonds)
Lower melting point that Ionic compounds
Lower boiling point that Ionic compounds
Poor conductors of electricity

12. What is a Double Bond?
Double Bond is a covalent bond where two pairs of electrons are shared

13. What is a Triple Bond?
Triple Bond is a covalent bond where three pairs of electrons are shared

14. Polar Molecule - Water
What is the charge of the Hydrogen side of the molecule?
What is the charge of the Oxygen side of the molecule?

15. Polar vs. Non Polar Molecule

16. Why don’t water and vegetable oil mix?
Oil is nonpolar, water is polar. Nonpolar and polar compounds do not mix well together.

17. When you do laundry, what causes the nonpolar dirt to mix with the polar water?
Detergent causes the dirt and water to mix

18. Steel = Iron + other metals
What is an alloy?
An alloy is a mixture made of two or more elem______, at least one of which is a metal.
Alloys are generally stron_______ and less reactive than the pure metals from which they are made
ents
Steel = Iron + other metals
ger
Brass = Copper + Zinc

19. Which one is stronger? Pure gold or Gold alloy?
Gold Alloy is stronger

20. What is Alchemy?
More than thousand years ago, some people came up with a idea to turn cheap lead metal and turn it into gold by adding acid to it.
Question: Is that possible?
Answer: No.

21. Why can’t one element be made into another element by a chemical reaction?
Because chemical change involves the electrons but doesn’t affect the nucleus.
Since the number of protons determines the identity of the atom, one element can’t be made into another element by a chemical reaction.

22. What is the symbol for Gold?Au
Someone grabs your gold chain and you say A-u give me back that gold

23. What is the symbol for Silver?Ag
As I Age my hair turns silver

24. What is the symbol for Sodium?Na
Na, I don’t want any salt.

25. What is the symbol for Potassium?K
The first three letters of potassium is pot. Pots are also named Kettles

26. What is the symbol for Iron?Fe
The giant pumping iron says Fe fi fo fum.

27. Symbols you need to know for the Test
H = Hydrogen
He= Helium
Li = Lithium
Be = Beryllium
B = Boron
C = Carbon
N = Nitrogen
O = Oxygen
Na = Sodium
K= Potassium
Fe = Iron
Ag = Silver
Au = Gold