Use these slides to quiz your knowledge of 1st
Semester Stuff!! The first slide is the “quiz”
the slide that follows you will find the
answers
Sig Figs
 How many sig figs?
1.
2.
3.
4.
5.
6.751 g
0.157 kg
28.0 mL
2500 m
0.0067 g
Sig Figs
 How many sig figs?
1.
2.
3.
4.
5.
6.751 g
0.157 kg
28.0 mL
2500 m
0.0067 g
4
3
3
2
2
**Click for a tutorial video
on Sig Figs
To Review Sig Fig Rules see “Problem-Solving
Strategy” p. 51 in Red Book
Periodic Table Stuff
 Atomic number = position on table (what does the
number tell you?)
 Atomic mass – what makes up this mass
 Isotopes – What are they?
Periodic Table Stuff
 Atomic number = position on table (what does the
number tell you?)
 The number of protons in the nucleus
 Also, ID’s the element on the periodic table
 Atomic mass – what makes up this mass
 Number of protons + number of neutrons
 Isotopes – What are they?
 Atoms with the same number of protons but different
number of neutrons
Element, Compound & Mixtures?
 Indicate which of the following is an element,
compound, heterogeneous mixture or solution:
1. Ocean water
2. Calcium
3. Vitamin C
4. Dry ice (solid CO2)
5. Copper
6. Grain alcohol
7. After-shave lotion
Element, Compound & Mixtures?
 Indicate which of the following is an element,
compound, heterogeneous mixture or solution:
1. Ocean water
heterogeneous mixture
2. Calcium
element
3. Vitamin C
compound
4. Dry ice (solid CO2) compound
5. Copper
element
6. Grain alcohol
solution or compound
7. After-shave lotion
solution
Physical & Chemical Properties
 Classify each as a chemical or physical property:
1. Reacts with water
2. Is red
3. Conducts electricity
4. Resists corrosion
5. Boils at 88oC
6. Is 1.5 m long
Physical & Chemical Properties
 Classify each as a chemical or physical property:
1. Reacts with water
chemical
2. Is red
physical
3. Conducts electricity
physical
4. Resists corrosion
chemical
5. Boils at 88oC
physical
6. Is 1.5 m long
physical
Solute, Solvent & Precipitate
 Salt water: What is the solute? What is the solvent?
 What is a precipitate?
Solute, Solvent & Precipitate
 Salt water: What is the solute? What is the solvent?
 Salt = solute
 Water = solvent
 What is a precipitate?
 A solid produced during a chemical reaction
Naming – Writing Formulas
 Write the formulas for the following:
1. Lithium fluoride
2. Calcium oxide
3. Barium hydroxide
4. Sodium sulfate
5. Potassium perchlorate
6. Magnesium sulfite
7. Calcium hypophosphite
8. Hydrochloric acid
9. Nitric acid
10. Manganese (III) chloride
Naming – Writing Formulas
 Write the formulas for the following:
1. Lithium fluoride
LiF
2. Calcium oxide
CaO
3. Barium hydroxide
Ba(OH)2
4. Sodium sulfate
Na2SO4
5. Potassium perchlorate
KClO4
6. Magnesium sulfite
MgSO3
7. Calcium hypophosphite
Ca3(PO2)2
8. Hydrochloric acid
HCl (aq)
9. Nitric acid
HNO3 (aq)
10. Manganese (III) chloride
MnCl3
Naming – Writing Names
 Name the following compounds:
1. Fe2(SO4)3
2. KNO2
3. KClO3
4. CuCl
5. PbI2
6. NiBr2
7. Hg(IO3)2
8. NO2
9. H3PO4 (aq)
10. H2SO4 (aq)
Naming – Writing Names
 Name the following compounds:
1. Fe2(SO4)3
Iron (III) Sulfate
2. KNO2
Potassium Nitrite
3. KClO3
Potassium chlorate
4. CuCl
Copper (I) chloride
5. PbI2
Lead (II) iodide
6. NiBr2
Nickel (II) bromide
7. Hg(IO3)2
Mercury (II) iodate
8. NO2
Nitrogen dioxide
9. H3PO4 (aq)
Phosphoric acid
10. H2SO4 (aq)
Sulfuric acid
Balancing Equations
 Balance the following:
Mg + O2  MgO
2. Al + Pb(NO3)2  Al(NO3)3 + Pb
3. Chlorine + magnesium iodide  magnesium chloride +
iodine
4. Zinc + sulfuric acid  zinc sulfate + hydrogen
1.
Balancing Equations
 Balance the following:
Mg + O2  MgO
2Mg + O2  2MgO
Al + Pb(NO3)2  Al(NO3)3 + Pb
2Al + 3Pb(NO3)2  2Al(NO3)3 +3 Pb
Chlorine + magnesium iodide  magnesium chloride +
iodine
Cl2 + MgI2  MgCl2 + I2
Zinc + sulfuric acid  zinc sulfate + hydrogen
Zn + H2SO4  ZnSO4 + H2
Calculate the Formula Mass
 Calculate the formula mass or molecular mass:
1. H2SO4
2. Fe(CH3COO)3
Calculate the mass in grams
**The only difference between calculating formula mass
and mass in grams is the units. The procedure is the
same.
Calculate the Formula Mass
 Calculate the formula mass or molecular mass:
1. H2SO4
1.
(2 x 1.01) + 32.1 + (4 x 16) = 98.12 g
Fe(CH3COO)3
55.8 + (6 x 12.0) + (9 x 1.01) + (6 x 16.0) = 232.89
Calculate the mass in grams
**The only difference between calculating formula mass and
mass in grams is the units. The procedure is the same.
Percent Composition
 calculate the percentage of nitrogen in ammonium
nitrate, NH4NO3, an important source of nitrogen in
fertilizers.
 Calculate the percent compositions of the following:
 Fe2O3
 Ag2O
Percent Composition Answer
 calculate the percentage of nitrogen in ammonium
nitrate, NH4NO3, an important source of nitrogen in
fertilizers.
Percent Composition Answer
 Fe2O3
Empirical & Molecular Formula
 Determine the empirical formula for sodium sulfite.
Sodium sulfite contains 36.5% sodium, 25.4% sulfur, and
38.1% oxygen.
 An organic compound is found to contain 92.25% carbon
and 7.75 % hydrogen. If the molecular mass is 78.0 grams,
what is the molecular formula?
(not on test)
 A hydrated compound has an analysis of 18.29 % Ca,
32.37% Cl, and 49.34% H2O. What is its formula?
Empirical & Molecular Formula
 Determine the empirical formula for sodium sulfite.
Sodium sulfite contains 36.5% sodium, 25.4% sulfur,
and 38.1% oxygen.
Empirical & Molecular Formula
 A hydrated compound has an analysis of 18.29 % Ca,
32.37% Cl, and 49.34% H2O. What is its formula?
Electron Configuration
 Write the electron configurations of the following
elements:
1. Sulfur
2. Calcium
3. Bromine
Use the noble-gas notation, write the electron
configuration of the following:
1. Fluorine
2. Cobalt
3. Phosphorus
Electron Configuration
 Write the electron configurations of the following
elements:
1. Sulfur
2. Calcium
3. Bromine
Electron Configuration
Use the noble-gas
notation, write the
electron configuration
of the following:
1. Fluorine
2. Cobalt
3. Phosphorus
Electron Dot Structures
 How do you know how many valance electrons
elements have?
 Write the electron dot structures for the following
elements:
1. Nitrogen
2. Aluminum
3. Neon
4. Lead
Electron Dot Structures
 How do you know how many valance electrons
elements have?
 Look for the highest energy level, then total up the
number of electrons in the s & p sublevels.
Electron Dot Structures
 Write the
electron dot
structures for
the following
elements:
1. Nitrogen
2. Aluminum
3. Neon
4. Lead
Development of the Modern
Periodic Table
 Which Scientist characterized the “Law of Octaves”?
Which Region contains the :
Halogens
Alkaline Earths
Noble Gasses
Alkali Metals
Development of the Modern
Periodic Table
 Which Scientist characterized the “Law of Octaves”?
Which Region contains the :
Halogens - C
Alkaline Earths - B
Noble Gasses - D
Alkali Metals - A
Development of the Modern
Periodic Table
Which region is referred to as the
p-block
d-block
s-block
f-block
Development of the Modern
Periodic Table
Which region is referred to as the
p-block D
d-block C
s-block A
f-block B
Classification of the Elements
Which element has an electron configuration that ends
in the 5th energy level?
Which element is most metallic?
Classification of the Elements
Which element has an electron configuration that ends
in the 5th energy level? C
Which element is most metallic? A
Classification of the Elements
What is the most important
characteristic in determining an
element’s chemical properties?
Classification of the Elements
What is the most important
characteristic in determining an
element’s chemical properties?
The number of valence electrons
Periodic Trends
Which diagram correctly depicts the trend in
Electronegativity
First ionization energy
Atomic Radius
Ionic Radius
Periodic Trends
Which diagram correctly depicts the trend in
Electronegativity
B
First ionization energy
B
Atomic Radius
C
Ionic Radius
C
Periodic Trends
In each pair which one is larger?
Na, Rb
Br, BrS, Mg
K, K+
Periodic Trends
In each pair which one is larger?
Na, Rb
Br, BrS, Mg
K, K+
Rb
BrMg
K