1. CHEMISTRY December 16, 2014
CHEMICAL BONDS

2. YOU ARE SILENT AND SEATED
SCIENCE STARTER
PICK UP FROM BACK TABLE
3 MINUTES
YOU ARE SILENT AND SEATED

3. IMPORTANT DATES DUE TODAY THURSDAY – LAB
WINTER ORNAMENTS AND PERIODIC TABLE MURDER MYSTERY
THURSDAY – LAB
FRIDAY – QUIZ ON PERIODIC TABLE

4. AIM
In a chemical reaction between lithium and chlorine, what types of ions will be formed? State your claim and provide evidence.

5. VOCABULARIES
CHEMICAL BOND
IONS
CATION
ANION
OCTET RULE

6. CHEMICAL BOND
attraction between atoms that allows the formation of chemical substances that contain one or more atoms.

7. ION
An atom or molecule in which the total number of electrons is not equal to the total number of protons, giving the atom or molecule a net positive or negative electrical charge.

8. CATION
a neutral atom loses one or more electrons and has a net positive charge.

9. ANION
a neutral atom gains one or more electrons and has a net negative charge.

10. OCTET RULE
atoms tend to combine in such a way that each atom has 8 electrons a neutral atom loses one or more electrons and has a net positive charge.

11. LEWIS DOT STRUCTURE - ATOMS
Element
Lewis Dot Structure Li Ne Cl Mg

12. LEWIS DOT STRUCTURE - IONS
Element
Lewis Dot Structure
Symbol
Lithium ion
Chloride ion
Oxygen ion
Magnesium ion

13. QUESTION 1
What is the difference between an atom and an ion?

14. ANSWER 1
atom is the smallest unit of an element. Atom is neutral and has the same number of protons and electrons
ions are electrically charged particle in which number of electrons do not match number of protons

15. QUESTION 2
How many valence electrons does a chlorine atom have?

16. ANSWER 2 7

17. QUESTION 3
How many valence electrons does a chloride ion have?

18. ANSWER 3 8

19. QUESTION 4
Using the table above, name one cation and one anion.

20. ANSWER 4 Cation = lithium ion and magnesium ion
Anion = chloride ion and oxygen ion (oxide)
NOTE: if cation just add element name and ion
NOTE: if anion add “IDE”

21. QUESTION 5 Lithium is part of what group?
What is the trend for elements in this group in terms of forming ions?

22. ANSWER 5 ALKALI METAL (GROUP 1)
FORMING ANIONS WITH A CHARGE OF -1 (LOSE ONE ELECTRON)

23. QUESTION 6 Chlorine is part of what group?
What is the trend for elements in this group in terms of forming ions?

24. ANSWER 6 GROUP 17 (HALOGEN)
CATIONS WITH A CHARGE OF + 1 (GAIN ONE ELECTRON)

25. QUESTION 7
Based on the number of valence electrons for each element, why don’t elements in the Noble Gas Group readily form compounds with other elements?

26. ANSWER 7
OCTET RULE
NOBLE GAS RULES ALREADY HAVE 8 VALENCE ELECTRONS SO ALREADY STABLE.

27. AIM PROMPT WRITE YOUR RESPONSE TO THE AIM PROMPT
In a chemical reaction between lithium and chlorine, what types of ions will be formed? State your claim and provide evidence.