chemistry week 4 · 2020. 2. 1. · 4. draw what you think an atom looks like. label your drawing....

Chemistry Friday, September 15th – Monday, September

18th, 2017

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 “Demonstration

Notes”

Finished? Take out your planner and table of contents.

Planner: •  Finish Atomic Theory WS •  2 more chapters until the unit test J

Table of Contents #1: 16.  Inquiry Demo 17.  Early Atomic Theory CN A 18. Atomic Theory WS

Demo •  Therewillbeasponge,rubbingalcohol,dryice,andasealedglassjar

•  Underneathyourdo-now,writeapredic9onaboutwhatyouTHINKwill

happen

Demonstration • Wealreadypredictedwhatwewillsee

Observa1onexpecta1ons:

– Watchwithyoureyes

– Waitun9lthedemonstra9onisfinishedto

writeorsayanything

– Summarizein1-2sentencesORasimple

diagram

Demo • Now,writedownthreeques9onsyouhaveaboutwhatyousaworaboutthe

experimentalvariables.

• Ques9onsshouldbescience-relatedandsomethingyoucannotyetanswer

Demonstration •  Partner(s):•  Shareeachofyourques9onswitheachother

•  Decideasagroupwhichques9onisthe“best”andcouldbeansweredwith

addi9onalevidence,andeveryoneshould

writeitontheirpaper.

•  Ifitisyourownques9on,simplyputastar

nexttoit

Explanation •  Now,wewillre-watchthevideowiththeexplana9on.

•  Remember–thisisapreviewintowhat

wearelearning.Wewillgooverthese

conceptsagain.

• Writedown2-3piecesofevidencethat

couldusetohelpexplaintheexperiment

oryourques9on.

Conclude •  Useyourevidencetotrytoansweryourques9on.Youmayneedtomakean

inference.

•  Useoneofthefollowingpro-talksentenceframes:

– “Ifwelookatboth….and….Wecansee

that….”

– “Basedontheevidence,suchas…,wecanconcludethat….”

FLT •  I will be able to describe early ideas

about the atom by completing Early Atomic Theory Notes A

Standard HS-PS1-8:Developmodelstoillustratethechanges

inthecomposi1onofthenucleusoftheatomand

theenergyreleasedduringtheprocessesoffission,

fusion,andradioac1vedecay

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

Early Atomic Theory: Part A

Defining the Atom

What is an Atom?

What is an Atom? •  Atom=thesmallestpar9cleofanelementthat

retainsitsiden9tyinachemicalreac1on

•  Anatomisextremelysmall-whatwouldbe

neededinorderforpeopletodiscoverit?

A history of the atom

•  AncientGreece:PhilosopherDemocritusdidnotdiscover

theatom,buthewasoneof

thefirsttosuggesttheir

existence.

A history of the atom •  Democritusdescribedatoms

asindivisibleand

indestruc9ble.

•  Washecorrect?Couldhe

supporthisideas?

•  àTherewasnoevidenceto

supportDemocritus’ideas

(yet)

John Dalton - 1776-1844 •  JohnDaltonwasachemistwhostudiedgases,

pressure,andtheexistenceofatoms.

John Dalton - 1776-1844 •  JohnDalton=supportedDemocritus’ideawith

scien9ficevidence.

•  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

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? •  Atomscanbeseen

usingextremely

highpowered

microscopes,such

asscanning

tunneling

microscopes.

Sample Questions 1. The ancient Greek philosopher credited with suggesting all matter is made of indivisible atoms is A. Plato B. Aristotle C. Democritus D. Socrates

Sample Questions 1. The ancient Greek philosopher credited with suggesting all matter is made of indivisible atoms is A. Plato B. Aristotle C. Democritus D. Socrates

Sample Questions 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

Sample Questions 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

Sample Questions 3.  Individual atoms are observable with a.  the naked eye b.  a magnifying glass c.  a light microscope d.  a scanning tunneling microscope

Sample Questions 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. Whatisanatom?

2. WhatdidDemocritusbelieve?

3. ListthefourpartsofDalton’satomictheory.

CW • Use your notes and the textbook to

answer the worksheet questions • Attempt every question, even if you’re

not sure – we’ll review the other topics in future notes

• You may work on stamp sheet assignments