1. One idea that Dalton contributed to modern atomic theory = … Day 2 11-28.
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Transcript of 1. One idea that Dalton contributed to modern atomic theory = … Day 2 11-28.
Dalton’s Atomic Theory (1800s):
1. All matter is composed of extremely small particles called atoms.
2. Atoms of a given element are identical in size, mass, and other properties; atoms of different elements differ in size, mass, and other properties.
3. Atoms cannot be subdivided, created, or destroyed.
4. Atoms of different elements combine in simple whole-numbered ratios to form chemical compounds.
5. In chemical reactions, atoms are combined, separated, or rearranged.
Modern Atomic Theory:
1. All matter is composed of extremely small particles called atoms.
2. A GIVEN ELEMENT CAN HAVE ATOMS WITH DIFFERENT MASSES
3. ATOMS ARE DIVISIBLE INTO EVEN SMALLER PARTICLES.
4. Atoms of different elements combine in simple whole-numbered ratios to form chemical compounds.
5. In chemical reactions, atoms are combined, separated, or rearranged.
We have Atoms! - 1800’s
relative atomic weightsrelative atomic weightssymbolssymbols
Michael FaradayMichael Faraday realized that realized that _______________ is _______________ is somehow related somehow related to atoms and to atoms and chemical bonds.chemical bonds.
electricityelectricity
We have Atoms! - 1850’s • Cathode Ray Tubes
–Invented and studied in the mid-1800’s
–A beam of cathode ray particles . . .
• applies ________,
• makes the temperature of objects _________,
• and is affected by ___________ and ___________ fields.
forceforce
warmerwarmerelectricelectric
magneticmagnetic
We have Atoms! - 1872Dmitri Mendeleev
• Organized elements and “Father” of the __________ __________.
• Determined properties of elements that would be ______________ ______
Periodic Periodic TableTable
discovered in the discovered in the futurefuture
We have Atoms! - 1895 Wilhelm Röntgen
• Discovered that metals release mysterious waves when they are bombarded with _______ ____.
–These mysterious waves are called ________...
cathodecathode
X - raysX - rays
raysrays
We have Atoms! - 1895 Wilhelm Röntgen
X - raysX - rays
nonspontanenonspontaneousousturned turned ononand offand off
–These mysterious waves are called ________...
–These emissions are ______________ and can be _________
_______
We have Atoms! - 1896 Henri Becquerel
• Discovered that _______ ore can expose photographic film.
–This phenomenon is called ________.
–These emissions are __________, are __________, and ...
uraniumuranium
radiationradiation
spontaneousspontaneousalways “on”always “on”
We have Atoms! - 1896 Henri Becquerel
–This phenomenon is called ________.
–These emissions are __________, are __________, and ... _______________________________________.
radiationradiation
spontaneousspontaneousalways “on”always “on”
are NOT caused by an are NOT caused by an outside sourceoutside source
Day 3 11-29
How are X-rays different than radiation (you should be able to answer more than one way)?
Go to usatestprep.com/Home
Click on Member Login in the top right corner
Create your own account:
Account ID: stroudsburg94Student Activation Code: stu1483
Join our class.
Go to usatestprep.com/Home
Log in.
Click on the assignments tab and complete Practice Test 2. Anyone that improves their score from Friday will receive a bonus point.
Day 6 12-4
How did Thomson’s plum pudding model explain the structure of an atom (from book assignment)?
Go to usatestprep.com/Home and log in.
Click on the assignments tab and complete today’s assignments in the following order:
1st = Cell Growth Practice 12-42nd = Homeostasis Practice 12-43rd = Evolution Practice 12-44th = play the game corresponding to your lowest practice score
Anyone scoring a 7/10 or higher on all three practice assignments will receive a bonus point.
We have Atoms! – 1897 J. J. Thomson
• Studied _________ ______.
• All metals create _______________________.
• Cathode ray particles are _____ and _________ _________.
• Thomson coined the _______ as another name for ______ ___ _________.
cathode cathode raysrays
identical identical cathode rayscathode rays tinytiny
negatively negatively chargedcharged
electronelectron
particlesparticlescathode cathode ray ray
We have Atoms! – 1897 J. J. Thomson
solidsolidspheresphere
negative electronsnegative electronspositive positive surroundingssurroundings
• Atom’s appearance:
–______
–_______–Parts
•________________
•_______ ___________
Period 7 11-10
1. What 2 important things did the cathode ray tube prove about electrons?
2. Explain how an x-ray works. (use your book and/or notes if necessary)
Day 1 11-11-11
• Investigated _________ and its behaviors.
• The chemical properties of radioactive elements _______ as radiation is emitted.
radiationradiation
changechange
We have Atoms! – 1898Marie Skłodowska Curie and Pierre Curie
• Isolated and discovered the elements _________ and ________.
poloniumpoloniumradiumradium
We have Atoms! – 1898Marie Skłodowska Curie and Pierre Curie
Period 4 11-10