Unit 2 Notes 4

Question 1

Molecule

Answer 1

composed of 2 or more atoms chemically combined
eg. H2, H2O

Question 2

Compound

Answer 2

composed of 2 or more different elements,
eg. H20, NaCI

Question 3

Naming and writing Formulas

Answer 3

There are two methods to writing and naming formulas. One method when the elements are both nonmetals and one method
When the elements are on opposite sides of the staircase.

Question 4

Molecular Compounds

Answer 4

(elements are on the same side of the staircese)
Only used for binary (two elements) compounds where both elements are non- metals

Question 5

Greek prefixes

Answer 5

1. Mono
2. Di
3. Tri
4. Tetra
5. Penta
6. Hexa
7. Hepta
8. Octa
9. Nona
10. Deca

Question 6

Naming molecular cmpds

Answer 6

I. The subscript behind the symbol indicates the prefix to be used on that element.
2. The name of the second element ends with “ide”