Launch: 10/26Grab your binder and immediately take a seat

Place homework (Mind Map) on desk

1.Why do atoms form bonds?

2.What subatomic particles are involved in bonding?

3.Label the following as metal, semimetal, or nonmetal

i. Si ii. Al iii. H iv. Ca v.Ni

What are the 3 types of chemical bonds? – Part II

Mr. Heffner10/26/09

What is a chemical compound?

A chemical compound is…a substance made of two or more atoms held

together by a chemical bonda.k.a. molecule

just means “stuff”

What is a chemical compound?

Two ways to represent compounds1. Drawing

1. Chemical formula 2 Hydrogen atoms 1 Oxygen atom

H HO

Chemical Bond

H2OSubscript

What is a chemical compound?

Two ways to represent compounds1. Drawing

1. Chemical formula 1 sodium atom 1 oxygen atom 1 hydrogen atom

Na HO

NaOHcapital letter = different element

What are the 3 types of bonds?

1. Ionic Electrons are exchanged (or transferred) Between a metal and a nonmetal

2. Covalent1. Electrons are shared

2. Between a nonmetal and a nonmetal

� Metallic Electrons are shared Between a metal and a metal

Which electrons?

Is it ionic, covalent, or metallic?

Example: LiClStep #1: identify the atoms

Li = lithiumCl = chlorine

What are the 3 main categories?

Metals

Semim

etalsNonm

etals

Example: LiClStep #2: metal or nonmetal?

Is it ionic, covalent, or metallic?

Example: LiClStep #3: match the combination

a metal (Li) and a nonmetal (Cl)

Ionic

Li Cl

Is it ionic, covalent, or metallic?

Example: H2OStep #1: identify the atoms

H = hydrogen (X2)O = oxygen

What are the 3 main categories?

Metals

Semim

etalsNonm

etals

Example: H2OStep #2: metal or nonmetal?

Is it ionic, covalent, or metallic?

Example: H2OStep #3: match the combination

two nonmetals (H) and a nonmetal (O)

Covalent

H HO

Practice Questions Practice Questions Worksheet

Answer in complete sentences!

Benchmark ScoringThis does not count for a grade!

1.Switch papers with your partner

2.Transpose scores onto bubble sheet Hypothesis X 2 = 4 Method X 2 = 8 Diagram X 2 = 4 Table of results X 2 = 4 Longer report X 2 = 4 Conclusion X 2 = 4

If it is a decimal, round down after doubling

Exit Slip1. In the chemical compound SOCl2 there is/are

a. two chlorine atoms and two sulfur atoms.

b. only one atom of each element.

c. the element solarium (So).

d. one sulfur atom, two chlorine atoms, and one oxygen atom.

Exit Slip2. In covalent bonding,

a. valence electrons are exchanged.

b. only metals interact with other metals.

c. valence electrons are shared

d. atoms become less stable due to the octet rule.

Exit Slip3. Ionic bonds form between which two types of

elements?a. alkali and alkaline earth metals

b. halogens and other halogens

c. metals and nonmetals

d. nonmetals and other nonmetals

Exit Slip4. What type of compound is H2SO4?

a. metallic

b. covalent

c. ionic

d. none of the above

Exit Slip5. Which of the following is an example of an ionic

compound?a. AlCl3b. CCl4c. O2

d. Zn2+

HomeworkFinish practice questions