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Overview         (For age - group : 11 - 16 )

This 70-minute educational atomic theory animation shows the experiments and foundation work by Dalton that lead to atom. It presents the story of his logic, flaws and subsequent modifications to the model. It is meant for high school and college physics classes.

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Time (hr:min:sec) 1:10:0
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Category : Physics
Type : Animation
Animation Type : Advanced

Total animation length
: 70 minutes

1) History of atomic model
2) Law of conservation of matter
3) Law of fixed composition
(law of definite proportions)
4) Law of multiple proportions
5) How could Dalton link the physical elements
to the unseen atom?
6) Explanation: Law of definite proportions
7) Law of conservation of mass
8) Flaws of Dalton's Atomic Model
9) Later modification of Dalton's atomic theory Explanatory notes-:
* Nature of matter prior to Dalton.
* Law of combining volumes.


Dalton's law of multiple proportion

The groundwork of the first atomic model was laid by Dalton around 200 years ago. Using only his intellect and experiments he peered deep inside matter to see atoms. This animation takes you through the journey his discovery.

Dalton's atomic theory

The animation brings out clearly the laws of conservation of matter, definite composition and multiple proportions. Also explained are how Dalton could link the physical matter to unseen atoms and the method by which he calculated the mass of an atom.
Later modifications to Dalton's atomic theory
The model proposed 200 hundred years ago was later modified by other scientists to include such corrections like diatomicity of gaseous atoms , divisibility of atom etc. Each point is animated for clearer understanding.
Details of the animation/ movie /software

This atomic theory animation explains the following in an interesting and informative manner:

    The basic laws of chemistry are based on fixed patterns followed by elements in their reactions. The groundwork done by Dalton, 200 years ago, with his law of multiple proportions was however path breaking and raised the ceiling for scientific quest. The law broke through mist of visibility and of volumes and weights and took science deep down to atoms. The model of the atom he established held on for a century and though was modified later, yet remained a source for other models. This 70-minute science animation presents the story of his logic, the flaws and the modification.

  1. History of atomic model : Brief history
  2. Law of conservation of matter : Shown through a common occurrence of wood burning.
  3. Law of fixed composition (law of definite proportions): Animated presentation of Louis Proust's copper carbonate decomposition and other examples like limewater experiment with CO2 and CO.
  4. Law of multiple proportions :Proved taking oxides of Nitrogen example.
  5. How could Dalton link the physical elements to the unseen atom? : A logical and detailed, step by step treatment of Dalton' s theorization that gives an insight how could use the same information available with everyone to see atoms where others saw matter. Included in the animation is a note on Dalton's imagination for understanding his methods and the subsequent establishment of law of multiple proportions.
  6. Explanation: Law of definite proportions: The law is re-explained using Dalton's atoms.
  7. Law of conservation of mass: The law is re-explained using Dalton's atoms.
  8. Flaws of Dalton's Atomic Model: Dalton's law failed in periodic table, compounds and spectrum, these shortcomings led to its modification.
  9. Later modification of Dalton's atomic theory: A number of modifications that took in the Dalton's models are explained here including divisibility, destruction, radioactive decay, isotopes of atoms and diatomicity of gases.
  10. Explanatory notes-:
    * Nature of matter prior to Dalton.
    * Law of combining volumes.

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Q & A
Q1: 10 jeaddah 9/12/2015
Q2: write the modification of Dalton's atomic theory donald peters 10/4/2011
Q3: is dalton atomic weight is of high frequency atomic weight srk 30/9/2010
Q4: animation on chemistry prisca onyechege 5/2/2010
Q5: acceptance of each item of the theory okeke tim 3/2/2010
Q6: which scientist modified dalton atomic model?? m niveditha anand 4/12/2009
Q7: what did daltons atom model look like?????? andy 2/12/2009
Q8: What are the drawbacks of dalton's atomic theory? neeraj 16/7/2009
Q9: modification of daltons atomic theory Akaniru Ronald 11/2/2009
Q10: how to vedeos download atomic theory maruthi 1/12/2008
Ans: There is a free video available in the download section, for the rest either you purchase to download them or view them online after paying for a subscription
Q12: how can we calculate speed of photon having some energy say 1.67 Mev? sarwat 2/10/2008
Q13: In what ways did daltons model differ from that of the greek model? naquelle ballard 1/10/2008
Q14: how did rutherford's model differ from Daltons? nikki 11/3/2008
Q15: What were the characteristics of Dalton's model of the atom? Adriana 9/9/2007
Ans: All matter consists of made up of tiny indivisible particles called atoms. Atoms are indestructible and unchangeable by chemical or physical changes. Elements are characterized by the mass of their atoms. The atoms of an element are identical. Elements react to form compound (s) their atoms combine in simple, whole number ratios; there could be more than one ratio to form multiple compounds. In a given compound, the relative number and kind of atoms are constant.
Q16: Please give more information on rutterford's scattering exeoeriments Mayank Sharma 26/8/2007
Ans: Mayank, we have written an article on his experiment in our article section, please go through it and in case you need some specific information, then do write to us, we will be glad to assist you
Q17: were there any drawbacks of dalton theory? kim 19/8/2007
Ans: Daltonís model fell short on many counts to fully explain the atomic model like Similarity of elements in a particular group, what was the cause of compound formation, emission spectra etc. This led to modification in the Daltonís model, however this does not discount the brilliant work of a scientist that was way ahead of its time and laid the foundation of atomic theory.
Q18: modification of daltons atomic theory joseph 12/1/2007
Ans: These were gaseous elements are diatomic, atoms are divisible, atoms of same element can have different masses etc. please refer the animation for more info
Q19: How did Dalton discovered Law of Multiple Proportion? Lourd Arnie Amores 22/11/2006
Ans: Briefly, Daltonís work was influenced by Proustís law of definite proportion and his own study of partial pressure of gases as a metrologies and later through his experiments, as per his lab notebook it was as early as 1802 that started thinking in that line and in the paper on ďProportion of the gases or elastic fluids constituting the atmosphereĒ, he had established the basis and later in 1805 finally produced a paper on law of multiple proportion.
Q20: I want to buy the program but I dont have internet in my School. How I can do this. Thanks. Madelyn Merle Madelyn Merle 12/11/2006
Ans: Thanks for your enquiry, You can purchase and download the products to your computer and show them at school, but if your school wants to retain them then it will need to purchase a school site license.
Ans: Please refer our animation, preview and article section for details about the experiments
Q22: animation on chemistry mina 10/9/2006
Ans: coming up 10 more shortly

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