chemsitry week 5 - honors chemistry9/18/16 2 cw 1. complete the worksheet as a group. raise your...
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Chemistry Day 9
Monday, September 12, 2016
Do-Now Title: “BrainPOP: Atoms” 1. Complete the do-now on the worksheet
provided. Do not turn over until instructed to do so.
Finished? Take out your planner and table of
contents.
Announcements • Thisweek:
– UCLAinterns– Gradessubmi7edThursday!!
• Tradeindojopoints!– 5points=Cardinalpoints,treat,orpen/pencil
– 15points=HWstamp– Mosteachquarter=mysteryprize
Planner: • Grades submitted this Thurs! • Ch. 4 Quiz Mon 9/19 • Unit test week of 10/3 (100 pts!)
Table of Contents #1: 14. BrainPOP: Atoms
FLT • I will be able to preview the main ideas
of atomic theory by completing BrainPOP: Atoms
Standard HS-PS1-8:DevelopmodelstoillustratethechangesinthecomposiOonofthenucleusoftheatomandtheenergyreleasedduringtheprocessesoffission,fusion,andradioacOvedecay
BrainPOP:Atoms• WatchtheBrainPOPvideo• A:erthevideo,answertheques>onsinyourgroup–everymembermustcopydownthesameanswer
• Thegroupwiththemostcorrectanswersà+5dojopointseach
h7ps://www.brainpop.com/science/ma7erandchemistry/atoms/
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CW 1. Completetheworksheetasagroup.Raiseyour
handwhenyouthinkyouhaveallanswerscorrect.Firstgrouptohaveallanswerscorrect=dojopoints!
2. CompleteToCassignmentsorquietlyreadCh.4 Chemistry Day 9
Tuesday, September 13 – Wednesday, September 14, 2016
Do-Now Title: “Inquiry Demo” 1. Write down today’s FLT 2. What do you think atoms are? 3. What do you think atoms are made of? 4. Draw what you think an atom looks like. Label
your drawing. 5. What tools do you think you would need in order
to discover or study atoms? 6. Underneath your do-now, write “demo
observations and questions”
Finished? Take out your planner and table of contents.
Announcements • Thisweek:
– Grades!• Tradeindojopoints!• Makesureyou’redoingthefollowing:
– GeSngstamps– Retakinglowscores– Checkingtheweebly/remind– Checkingpowerschool
Planner: • Finish Ch. 4 Review WS by Friday
Table of Contents #1: 15. Inquiry Demo 16. 4.1 Cornell Notes 17. Ch. 4 Review WS
Demo • Materials:
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Demo • I’mgoingtotakeasponge,putsomerubbingalcoholonit,andthenputitinasealedglassjar
• Iwillthenturnthejarupsidedownontopofsomedryice
• Underneathyourdo-now,writeapredic>onaboutwhatyouTHINKwillhappen
Demo • Watchthedemo• Ifyou’reclosetothedemo,youmustweargoggles
• Writedownwhatyouseehappeningorwhatyouthinkyouseehappening.Discusswithyourgroupifneeded.
Demo • Now,writedownthreeques>onsyouhaveaboutthedemo.
Demo • Discussyourques>onswithyourgroup.• Decideasagroupwhichques>onisthe“best”orthemostinteres>ng,andeveryoneshouldwriteitontheirpaper.
• Whatdoyouthinkwesaw?
FLT • I will be able to describe early ideas
about the atom by completing 4.1 Notes
Standard HS-PS1-8:DevelopmodelstoillustratethechangesinthecomposiOonofthenucleusoftheatomandtheenergyreleasedduringtheprocessesoffission,fusion,andradioacOvedecay
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Notes Protocol • Title your notes & add assignment # • Complete Cornell-style • Copy down all bolded ideas • Noise level 0 • Raise hand to question/comment • Be prepared to pair-share-respond
Ch. 4 Notes
4.1: Defining the Atom
What is an Atom?
What is an Atom? • Atom=thesmallestpar>cleofanelementthatretainsitsiden>tyinachemicalreacOon
• Anatomisextremelysmall-whatwouldbeneededinorderforpeopletodiscoverit?
A history of the atom
• AncientGreece:PhilosopherDemocritusdidnotdiscovertheatom,buthewasoneofthefirsttosuggesttheirexistence.
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A history of the atom • Democritusdescribedatomsasindivisibleandindestruc>ble.
• Washecorrect?Couldhesupporthisideas?
• !TherewasnoevidencetosupportDemocritus’ideas(yet)
John Dalton - 1776-1844 • JohnDaltonwasachemistwhostudiedgases,pressure,andtheexistenceofatoms.
John Dalton - 1776-1844 • JohnDalton=supportedDemocritus’ideawithscien>ficevidence.
• Cameupwiththeearlyideasforatomictheory...
Dalton’s Atomic Theory 1. All elements are composed of tiny
indivisible particles called atoms
Dalton’s Atomic Theory 2. Atoms of the same element are identical.
The atoms of any one element are different from those of any other element.
Dalton’s Atomic Theory 3. Atoms of different elements can mix or
combine in simple whole-number ratios to form compounds
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Dalton’s Atomic Theory 4. Chemical reactions occur when atoms are
separated, joined, or rearranged. Atoms of one element, however, are never changed into atoms of another element as a result of a chemical reaction.
Dalton’s Atomic Theory Note:Not all of Dalton’s ideas were correct...as we will see when we talk about modern atomic theory :)
How Can We Study Atoms? • Atomscanbeseenusingextremelyhighpoweredmicroscopes,suchasscanningtunnelingmicroscopes.
4.1 Section Quiz 1. The ancient Greek philosopher credited with suggesting all matter is made of indivisible atoms is A. Plato B. Aristotle C. Democritus D. Socrates
4.1 Section Quiz 1. The ancient Greek philosopher credited with suggesting all matter is made of indivisible atoms is A. Plato B. Aristotle C. Democritus D. Socrates
4.1 Section Quiz 2. Dalton’s atomic theory improved earlier atomic
theory by a. teaching that all matter is composed of tiny
particles called atoms b. theorizing that all atoms of the same element are
identical c. using experimental methods to establish scientific
theory d. Not relating atoms to chemical change
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4.1 Section Quiz 2. Dalton’s atomic theory improved earlier atomic
theory by a. teaching that all matter is composed of tiny
particles called atoms b. theorizing that all atoms of the same element are
identical c. using experimental methods to establish scientific
theory d. Not relating atoms to chemical change
4.1 Section Quiz 3. Individual atoms are observable with a. the naked eye b. a magnifying glass c. a light microscope d. a scanning tunneling microscope
4.1 Section Quiz 3. Individual atoms are observable with a. the naked eye b. a magnifying glass c. a light microscope d. a scanning tunneling microscope
Pair-Share-Respond 1. What is an atom? 2. What did Democritus believe? 3. List the four parts of Dalton’s
atomic theory.
CW • Use your textbook to answer the Ch.
4 Review Worksheet questions. You • Ch. 4 begins on page 101 • Finish at least the first page tonight • You may work on stamp sheet
assignments
Chemistry Day 10
Thursday, September 15 – Friday, September 16, 2016
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Do-Now Title: “Atoms Kahoot!/4.2 S.A.” 1. Write down today’s FLT 2. Draw what an atom would look like according to
Democritus 3. What did Dalton provide that Democritus did
not? 4. Identify one way that both Dalton and
Democritus were mistaken about atoms 5. List one part of Dalton’s atomic theory. 6. Underneath your do-now, if you’re playing
Kahoot on your phone, write your initials. If you’re playing on paper, number 1-14.
Finished? Take out your planner and table of
contents.
Announcements • ExpectprogressreportsMonday• NextWednesday–BacktoSchoolNight6:30-8:00– Gym=Eng,Math– MediaCtr=VAPA,Language– Cafeteria=SocialSci,Science– CafeteriaService=PE/Dance
• Don’thaveyourpowerschoollogin?– Seeanyteacher,counselor,orAPforyourlogininforma>on
Announcements • UnitTestwillcoverCh.1,13,4,and25• Wanttobeexemptfromsemesterfinals?– Maintaina70%+onyourtests– Nomissinglabs– Have4orfewerToCssignmentstotal
Planner: • Get ALL stamps – ToC due week of 9/26 • Study ! Ch. 4 Quiz next week ☺
Table of Contents #1: 18. Atoms Kahoot/4.2 S.A. 19. 4.2 Notes WS
FLT • I will be able to describe early atomic
models by completing 4.2 Notes
Standard HS-PS1-8:DevelopmodelstoillustratethechangesinthecomposiOonofthenucleusoftheatomandtheenergyreleasedduringtheprocessesoffission,fusion,andradioacOvedecay
Notes Protocol • Title your notes & add assignment # • Complete Cornell-style • Copy down all bolded ideas • Noise level 0 • Raise hand to question/comment • Be prepared to pair-share-respond
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4.2: Structure of the Atom
What is an atom made of? • As it turns out, atoms ARE divisible, as three
main subatomic particles were discovered: # Protons
# Abbreviation: p+
# Neutrons # Abbreviation: n0
# Electrons # Abbreviation: e-
Subatomic Particles • Protons = • Charge: +1 charge • Location: particles found in the nucleus of an
atom • Mass: Relative mass = 1
Subatomic Particles • Neutrons = • Charge: uncharged • Location: particles found in the nucleus of an
atom • Mass: Relative mass = 1
Subatomic Particles • Electrons = • Charge: -1 charge • Location: particles found orbiting around the
nucleus • Mass: Insignificant mass
How???? • If atoms were so difficult to discover given their
tiny size, how were subatomic particles discovered??
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What does this mean? • What do we know about the two ends of
magnets? • What happens when we push magnets close
together (two different things can happen)? Why?
The discovery of the electron... • In 1897, J.J. Thomson discovered the electron • He conducted experiments using electric currents
passing through gases at low pressure
The discovery of the electron... • These electric currents produced a cathode
ray (a glowing beam) that traveled from the cathode (-) to the anode (+)
What does this look like?
In summary • Because the movement of the stream was from
the cathode (negative end) to the anode (positive end), there must be some part of the atom that is NEGATIVELY charged
Protons & Neutrons • 1886: Goldstein performed a similar experiment
and observed that there were positively-charged particles traveling toward the cathode. These positive particles would later be called protons.
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Protons & Neutrons • 1932: Chadwick
discovered the neutron. This particle was hard to discover because it is neutral, but it has a significant mass (about equal to a proton) that Chadwick studied.
Our Particles
Okay, so there are three particles... • How did scientists figure out the atom’s
composition?
Developing Atomic Theory… • Dalton thought atoms were
simply indivisible spheres • plum pudding model: J. J.
Thomson thought there were just (+) and (-) particles scattered within an atom.
• But then someone else discovered the nucleus...
Ernest Rutherford • In 1911, Rutherford’s
experiments involved shooting a beam of POSITIVELY CHARGED alpha particles at a thin sheet of gold foil
• He noticed that the vast majority of alpha particles passed through the foil easily.
• However, there were a FEW particles that were DEFLECTED back (did not go through).
Rutherford’s Conclusions • Most of the particles passed
through --> Most of an atom is empty space
• A few (very few) particles were deflected back --> since the alpha particles are positive, there must be a tiny, dense, positively-charged center in an atom
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Our atomic model so far... • Atoms are composed of three main subatomic
particles: p+, n0, e- • Protons and neutrons are located in the
nucleus of the atom, which is a very small, but dense (contains a LOT of mass in a small volume)
• Electrons are VERY tiny, negatively charged, and orbit around the nucleus. They make up most of the VOLUME of the atom.
But of course... • ...we still haven’t talked about modern atomic
theory and models yet :)
4.2 Section Quiz 1. Which of the following is NOT an example of a
subatomic particle? a. proton b. molecule c. electron d. neutron
4.2 Section Quiz 1. Which of the following is NOT an example of a
subatomic particle? a. proton b. molecule c. electron d. neutron
4.2 Section Quiz 2. The nucleus of an atom consists of a. electrons only b. protons only c. protons and neutrons d. protons and electrons
4.2 Section Quiz 2. The nucleus of an atom consists of a. electrons only b. protons only c. protons and neutrons d. protons and electrons
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4.2 Section Quiz 3. Most of the volume of the atom is occupied by
the a. electrons b. protons c. protons and neutrons d. neutrons
4.2 Section Quiz 3. Most of the volume of the atom is occupied by
the a. electrons b. protons c. protons and neutrons d. neutrons
4.2 Section Quiz 4. Which scientist discovered the neutron? a. Chadwick b. Dalton c. Thomson d. Rutherford
4.2 Section Quiz 4. Which scientist discovered the neutron? a. Chadwick b. Dalton c. Thomson d. Rutherford
Pair-Share-Respond 1. Identify our three subatomic
particles – list their charge, mass, and location.
2. Explain what was missing from Thomson’s plum pudding model
3. What were Rutherford’s two conclusions?
CW 1. Underneath your Kahoot/Do-Now,
answer questions 8-11, 13-14 on page 108
2. Stamps or study Ch. 4
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