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Chapter 3 Test
Most missed questions
Which is an intensive physical property?a. colorb. lengthc. massd. volume
Chapter 3 Test
Most missed questions
Which is an extensive physical property?a. Colorb. Densityc. lengthd. boiling point
Chapter 3 Test
Most missed questions
Helium does not react with any other element. What type of property is this?a. Chemicalb. Physicalc. Both chemical and physicald. None of the above
Chapter 3 Test
Please sit at these stations today
Science Fair Adopt A Stream Mini-ProjectsGroup 1 Group 3 Groups 4 - 7
Science Fair Adopt A Stream Mini-Projects• Peer review your
logbooks (problem, purpose, variables, hypothesis)• Discuss issues with
forms• Discuss upcoming due
dates• Discuss issues with
research (4 due next Monday)
• Discuss AAS guidelines• Look at things you can be
working on now for your portfolio• Review notes for
upcoming training• Discuss site visit form
requirements
• Discuss timeline• Discuss upcoming
research • Discuss issues with
turnitin.com• Topic assignment• Begin reviewing topics
Gifted Chemistry – Week 6
MondayInquiry Project ChatNotes: Atomic Theory
TuesdayNotes & Activity: Atomic Structure, Atomic Structure WS #1Scientist Quiz on Wednesday
WednesdayScientist Quiz, Atomic Structure WS #2
ThursdayNotes: Isotopes and Percent Abundance
FridayHalf-Life Lab (bring plain M&Ms for this activity!); Quia Due Sunday 11:59 pm
Atomic TheoryDay 27
Atomic Theory
DemocritusGreek philosopher (460 –
370 BC)• Matter is not infinitely
divisible• Matter made of tiny atomos
• Atoms can’t be created, destroyed or further divided
Atomic Theory
AristotleGreek philosopher (384 –
322 BC)• Rejected ideas of atoms• Matter is made of earth,
water, fire, and air
Atomic Theory
John Dalton (1766 – 1844)• Revived Democritus’s ideas • Developed atomic theory
based on experiments and scientific research
• Studied chemical reactions and was able to determine mass ratios
Atomic Theory
Dalton’s Atomic Theoryp. 104
Atomic Theory
Scientist ExperimentLed to discovery of
Sir William Crookesp. 108
J.J. Thomsonpp. 108 - 109
Robert Millikanp. 109
Ernest Rutherfordp. 111 - 112
Atomic Theory
Scientist ExperimentLed to discovery of
Sir William Crookesp. 108
Used cathode ray tube to create stream of negatively charged particles
Particles and their negative charge
J.J. Thomsonpp. 108 - 109
Used cathode ray tubes to determine mass was less than hydrogen atom
Identified 1st subatomic particle – the electron and the mass to charge ratio
Atomic Theory
Scientist ExperimentLed to discovery of
Robert Millikanp. 109
Used oil drops, X-rays, and electric fields
Charge and mass of the electron
Ernest Rutherfordp. 111 - 112
Fired beam of alpha particles at gold foil. Alpha particles were deflected, indicating a nucleus
Charge and mass of the proton
Atomic StructureDay 28
Atoms
• Smallest basic unit of matter• Made of protons, neutrons and
electrons• Protons and neutrons are in nucleus• Protons are positive; electrons are
negative• An element is a particular type of
atom
Elements
Find the number of
Protons
Neutrons
Electrons
Find the number of
Protons
Neutrons
Electrons
Cl35
17
2-Find the number of
Protons
Neutrons
Electrons
K39
19
+Find the number of
Protons
Neutrons
Electrons
Atomic StructureDay 28
Atomic Theory Quiz
On your device, go to Socrative app or www.socrative.com
Join room # 588405
Begin Quiz called: Atomic Theory Quiz
p. 118 # 16
Protons and
ElectronsNeutron
s Isotope Symbol
10 12 Neon-22 Ne
20 26 Calcium-46 Ca
8 9 Oxygen-17 O
26 31 Iron-57 Fe
30 34 Zinc-64 Zn
80 124 Mercury-204 Hg
1022
4620
2657
817
6430
20480
Atomic Mass Unit
1 amu is approximately equal to the mass of one proton or one neutron
Atomic mass of an element is the weighted average mass of the isotopes of that element.
Weighted AveragesCategory Percent Average Points
Daily 10% 85
Lab 20% 90
Test 50% 94
Final Exam 20% 82
Total 100%
Weighted AveragesCategory Percent Average Points
Daily 10% 85 8.5
Lab 20% 90 18
Test 50% 94 47
Final Exam 20% 82 16.4
Total 100% 89.9
Weighted AveragesIsotope Percent Atomic Mass Mass
Contribution
Chlorine-35 75.78% 34.969 amu
Chlorine-37 24.22% 36.966 amu
Total 100%
Weighted AveragesIsotope Percent Atomic Mass Mass
Contribution
Chlorine-35 75.78% 34.969 amu 26.50 amu
Chlorine-37 24.22% 36.966 amu 8.953 amu
Total 100% 35.453 amu
Weighted AveragesIsotope Percent Atomic Mass Mass
Contribution
Copper-63 69.2% 62.930 amu
Copper-65 30.8 % 64.928 amu
Total 100%
