Review

1
Review

• Chapters 4, 5 and 9

2

• What is the octet rule?

3

• It states that all atoms will be most stable with
  eight valence electrons

4

• What is the collision theory?

5

• That all atoms are moving, and sometimes the
  valence electrons in an atom will interact with
  another atom

6

• What is a Lewis Dot diagram?

7

• It is a model that helps to show the number of
  valence electrons in an atom

8

• What is an ionic compound?

9

• This is a compound that has one atom that
  unequally shares electrons with another atom
• Example NaCl

10

• What is a covalent compound?

11

• This is when two atoms combine in a way that the
  valence electrons are shared equally
• Example CO2

12

• What is a formula unit?

13

• This is the smallest whole number ratio of two
  elements in an ionic compound

14

• What is the oxidation number?

15

• It states the ionic charge of an element when it
  is chemically combined

16

• How do you find the oxidation state of a
  transition metal?

17

• By finding the total negative charge and then
  balancing the charge of the compound

18

• What is the net charge of a compound?

19

• zero

20

• Name and determine the formula for a combination
  of Sodium atoms and oxygen atoms.

21

• Na2O
• Name sodium oxide

22

• Name and determine the formula for a combination
  of chlorine atoms and magnesium atoms.

23

• MgCl2
• Name
• Magnesium Chloride

24

• What is a hydrate?

25

• A compound that has water molecules in between
  the ions in its crystal structure

26

• What is the name of H2SO4?

27

• Sulfuric Acid

28

• What is the name of NH3?

29

• Nitrogen trihydride

30

• What is the name of MgSO45H2O?

31

• Magnesium Sulfate pentahydrate

32

• Name the seven diatomic elements and give their
  ?EN.

33

• F2, H2, O2, N2, Cl2, Br2, I2
• ?EN is 0

34

• What two criteria are involved in determining the
  polarity of a compound?

35

• Geometric shape and ?EN

36

• What must be true to have a polar compound?

37

• There must be two poles, one positive and one
  negative

38

• What are some physical properties of ionic or
  polar compounds?

39

• High melting and boiling points, brittle as
  solids, have a definite crystal structure

40

• What are some criteria of covalent compounds?

41

• Low melting and boiling points, not electrolytes

42

• What are the eight geometric shapes talked about
  in class?

43

• Linear, trigonal planar, tetrahedral, trigonal
  pyramidal, bent, trigonal bipyramidal, and
  octahedral

44

• What is the range of ?EN for a polar covalent
  bond?

45

• 0.5 to 2.0