1. Atoms, Ions, Molecules, Nomenclature
Chapter 2

2. What is the weight of the empty jar in grams?
200
300
400
600

3. What is the weight of the empty jar in grams?
200
300
400
600

4. What does this information tell you?Zn 64 30

5. Zn 64 30
64 is the mass number, of this zinc isotope, it is the sum of the protons + neutrons
30 is the atomic number of this zinc atom, it is redundant, as all zinc has a mass number of 30, which means 30 protons and 30 electrons in a zinc atom.

6. What does this tell you? 1− Cl

7. 1− Cl
1- is the charge of this chlorine ion. Chlorine atoms have 17 protons and 17 electrons, thus this anion has 18 electrons.

8. What does this tell you? 3 H 2

9. 3 H 2
2 is the number of hydrogen atoms bonded to one another. This is a diatomic molecule of the element hydrogen.
3 is the coefficient in front of this hydrogen atom, which refers to the number of hydrogen molecules NOT bonded to each other. This would most likely be used while balancing a chemical equation.

10. How many electrons does a Cr3+ ion contain?21 24 28
not enough information to determine

11. How many electrons does a Cr3+ ion contain?21 24 28
not enough information to determine
24+
24e-
21e-
Cr3+ Cr
loses three
electrons

12. How many different isotopes exist for this element?

13. How many different isotopes exist for this element?5
5 naturally occurring isotopes 4 2 3 1

14. What is the likely identity of this element?Hg Pt Br Se As

15. What is the likely identity of this element?Hg Pt Br Se As

16. Silver exists as two naturally occurring isotopes
Silver exists as two naturally occurring isotopes. Which mass spectrum is the correct one for silver? 1 2 3 4

17. Silver exists as two naturally occurring isotopes
Silver exists as two naturally occurring isotopes. Which mass spectrum is the correct one for silver? 1 2 3 4

18. Representing Molecules

19. Symbolically (using numbers and letters) represent the items in each box.
a single hydrogen atom H

20. Symbolically (using numbers and letters) represent the items in each box.
a single hydrogen atom
two separated hydrogen atoms
three hydrogen molecules
a single hydrogen molecules made of two hydrogen atoms bonded together H 2H H2
3H2

21. What would you call each of these different ways to represent a molecule?

22. chemical or molecular formula
What would you call each of these different ways to represent a molecule?
structural formula
chemical or molecular formula
ball and stick model
space filling model

23. What is the chemical formula of the molecule represented by this ball and stick model?

24. dopamine, a neurotransmitter
What is the chemical formula of the molecule represented by this ball and stick model?
C8H11NO2
dopamine, a neurotransmitter
Note that the order of atoms in a chemical formula do not indicate the order of arrangement of atoms.
double bond

25. Navigating the Periodic Table

26. Apply these words correctly to the periodic table
group
column
row
family

27. Apply these words correctly to the periodic table
group
column
row
family

28. Apply these words correctly to the periodic table.
metals
nonmetals
transition metals
halogens
noble gases
alkali metals
alkaline earth metals

29. Apply these words correctly to the periodic table.
metals
nonmetals
transition metals
halogens
noble gases
alkali metals
alkaline earth metals
nonmetals
Metals

30. How can you tell looking at a chemical formula if the substance is ionic or molecular?
SrCl2
PF3
Ag2SO4
CH3COOH

31. How can you tell looking at a chemical formula if the substance is ionic or molecular?
If a substance is made of metals and nonmetals, we will consider that substance ionic.
If a substance is made of only nonmetals, we will consider that substance molecular.
metals
nonmetals
SrCl2
PF3
Ag2SO4
CH3COOH
Metals
nonmetals

32. Nomenclature

33. Systematic Method - Naming Acids
Does the anion contain oxygen? No
hydro-(anion root)-ic
Yes
check the ending of the root
-ITE
(anion root)-ous
-ATE
(anion root)-ic
HClO3
chloric
HClO4
perchloric HF
hydrofluoric
HCl
hydrochloric
HBr
hydrobromic HI
hydroiodic
H2S
hydrosulfuric
HCN
hydrocyanic
nitrous
HNO2
HNO3
nitric
sulfurous
H2SO3
H2SO4
sulfuric
phosphorous
H3PO3
H3PO4
phosphoric
H2CO3
carbonic
HC2H3O2
acetic

34. Write the name for H2SO3
Compare with
H2SO4
H2S

35. Write the name for H2SO3 sulfurous acid
Compare with
H2SO4 sulfuric acid
H2S hydrosulfuric acid

36. Write the formula for carbonic acid

37. Write the formula for carbonic acid
H2CO3

38. Write the name for HIO3

39. Write the name for HIO3 iodic acid
Compare with
HIO periodic acid
HIO iodous acid
HIO hypoiodous acid