CATALYST
1. What is the difference between a substance
and a mixture? Give one example of each.
2. What is the difference between a physical
change and a chemical change? Give one
example of each.
3. Magnesium reacts with oxygen to produce
magnesium oxide. If 2.4g of magnesium
reacts to make 2.9g of magnesium oxide,
how many grams of oxygen react?
ANNOUNCEMENTS
• Unit 1 exam on Friday 9/21
• Study guide and practice problems posted online
at haganchemistry.wikispaces.com
• Grades are up, if you have missing work this needs
to be turned in by Thursday
• khagan@dadeschools.net
• Office hours this week
• Thursday 2:30 – 3:30
• Friday 2:30 – 3:30
UNIT 1 REVIEW AND
ATOMIC STRUCTURE
UNIT 2, DAY 1
OBJECTIVES
• Start Unit 2 (45 min)
• SWBAT define atomic number and mass number,
and and explain the role of atomic number in
determining the identity of an atom.
SWBAT determine its number of protons, neutrons,
and electrons given the identity of an atom
SWBAT Describe the structure of atoms in terms of
protons, neutrons and electrons, and differentiate
among these particles
• Unit 1 Exam Review (40 min)
• SWBAT review key objectives from Unit 1.
AGENDA
• Start Unit 2 (45 min total)
• I Do: Notes on Atomic Structure
• We Do: Whiteboard Problems
• You Do: Complete Worksheet, Answer Independent
Questions
• Unit 1 Exam Review (40 min total)
• I Do: Recap Key Points
• We Do: Whiteboard Test Problems
• You Do: Independent Review Problems
• Closing: Answer EQ
ATOMIC STRUCTURE
• 3 Subatomic Particles:
• Protons: Large and Positive (+1), in the Nucleus
• Neutrons: Large and Neutral (0), in the Nucleus
• Electrons: Small and Negative (-1), outside the Nucleus
Atomic number =
(Number of protons)
3
Lithium
Number of neutrons = Mass
number – atomic number
Li
7
Mass number =
Number of protons + neutrons
Lithium
Electrons
Protons
3
Neutrons
4
Lithium
Number of
protons
This is because the
atom is neutral. The
charges balance out!
=
Number of
electrons
Electrons
3
-3 charge
Protons
3
+3 charge
Neutrons
4
No charge
Lithium
WE DO: WHITEBOARD EXAMPLE TABLE
Substance
Symbol
Atomic
Number
Lithium
Li
3
Carbon
C
6
Fe
Mass
Number
7
Number
of Protons
Number
of
Neutrons
6
26
30
*round the mass number to the nearest whole number
Number
of
Electrons
YOU DO: INDEPENDENT WORK
• Complete the remainder of the table
independently. If you finish early, continue on to the
following problems.
• P. 119 #23, 28, 29, 30
• P. 122 #47, 48, 49
UNIT 1 KEY TOPICS
1. Physical and Chemical Properties and Changes
2. States of Matter:
1. Energy and Definite/Indefinite
3. Elements, Compounds, and Mixtures
1. Differentiate between them
2. Homogeneous vs Heterogeneous
4. Separation Techniques
1. Filtration, Chromatography, Crystallization, Distillation
5. Law of Conservation of Mass
1. Definition
2. Calculating change in mass and giving reasons for
change.
WE DO: WHITEBOARDS 1
• Review the sample data for the reaction of Baking
Soda and Vinegar below.
• Calculate ∆m .
• Give one possible reason for the change in mass.
Mass of system
before change (g)
3. 89 g
Mass of system after
change (g)
3.84 g
∆m (g)
WE DO: WHITEBOARDS 2
• Where would one expect the motion of the
particles to be the highest? What state of matter is
found at that point?
• Identify the points where the matter has a
definite/indefinite shape and a definite/indefinite
volume.
WE DO: WHITEBOARDS 3
• Classify the following as a physical or chemical property.
•
•
•
•
Flammability
Reactivity
Color
Mass
• Classify the following as a physical or chemical change.
• Melting Ice
• Mixing Paint
• Rust Forming
• List 2 pieces of evidence that a chemical change has
taken place.
WE DO: WHITEBOARDS 4
• Draw molecular diagrams of an
element, compound and a mixture
WE DO: WHITEBOARDS 4
• Classify the following as an element, compound,
heterogeneous mixture or homogeneous mixture
1.
2.
3.
4.
5.
6.
O2 (Oxygen)
Sugar (C12H22O11)
Powerade
Hydrochloric Acid (HCl)
Steel (Fe, C, Cr)
Fruit Salad
WHITEBOARDS 5:
• True or False. If it is false, correct it.
• Filtration is commonly used to separate solids from
liquids or gases e.g. in air conditioning and in
wastewater treatment.
• Distillation separates mixtures based on how fast
they move through a liquid
• Chromatography uses crystals to separate
different substances.
• Crystallization separates liquids based on the
differences in their boiling points
YOU DO: INDEPENDENT REVIEW
PROBLEMS
• Start with the set you struggle most with.
1. P/C Prop and Change: p. 55 #39-41, p. 56 #60-61, p. 57
# 77
2. States of Matter: p. 55 # 45, Rank the states of matter
of chlorine in terms of increasing kinetic energy.
3. Elements, Compounds, and Mixtures: p. 55 # 53 (justify
by drawing a particle diagram), #48, 50
4. Separation Techniques: p. 41 #17, 19, Is the crystal that
forms during crystallization “pure”? Why or why not?
5. Law of Conservation of Mass: p. 57 # 80, 86, p. 59 #11
CLOSING
• How can I best review for the Unit 1 Exam?
• Homework: Review for the exam. The remaining
review problems are posted on the website along
with an answer key.