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

U N I T 2 , DAY 1

UNIT 1 REVIEW AND ATOMIC STRUCTURE

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 atomSWBAT 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

Li3

7

(Number of protons)

Number of protons + neutrons

Lithium

Number of neutrons = Mass number – atomic number

Lithium

Electrons

Protons 3

Neutrons

4

Mass number =

Atomic number =

Lithium

Number of protons

Number of electrons=

Lithium

Electrons

3

Protons 3

Neutrons

4

This is because the atom is neutral. The charges balance out!

-3 charge

+3 charge

No charge

WE DO: WHITEBOARD EXAMPLE TABLE

Substance Symbol Atomic

NumberMass

Number

Number of

Protons

Number of

Neutrons

Number of

Electrons

Lithium Li 3 7

Carbon C 6   6  

  Fe     26 30  

*round the mass number to the nearest whole number

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 Changes2. States of Matter:

1. Energy and Definite/Indefinite

3. Elements, Compounds, and Mixtures1. Differentiate between them2. Homogeneous vs Heterogeneous

4. Separation Techniques1. Filtration, Chromatography, Crystallization, Distillation

5. Law of Conservation of Mass1. Definition2. 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 mixture1. O2 (Oxygen)

2. Sugar (C12H22O11)

3. Powerade4. Hydrochloric Acid (HCl)5. Steel (Fe, C, Cr)6. 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 # 772. 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.