Atoms and atomic theory

Atoms and Atomic Theory

1. Atoms and Atomic Theory Essential Questions: How and why has the Atomic Theory changed over time? How can we describe the molecular motion of the states of matter?

2. Bellwork Chemical Property Physical Property Reactivity Cconductivity Flamibility Density Specific Heat Ductility Magnetism Malleability

3. Bellwork Place the Atomic Theory Cards in order. Fill in this chart in your notebook. Dalton’s Atomic Theory Facts Explain why you placed these facts in this order. What is your evidence?

4. Dalton’s Atomic Theory Atoms are tiny, invisible particles . Atoms of different elements are different Compounds are formed by combining atoms . Atoms of one element are the same.

5. Atomic Theory Title your page: TIMELINE Cut out the atomic models and the words. Match the model to the explanations. DO NOT GLUE!

6. Atomic Theory Timeline Scientist Information Model John Dalton 1808 Matter is formed of small pieces that could not be cut into smaller parts called “ atomos ” meaning uncuttable .

7. Scientist Information Model J.J Thompson 1897 Atoms are made mostly out of (+) charged materials, like dough in a bun. The (-) charged electrons are found inside the (+) dough. Atomic Theory Timeline

8. Scientist Information Model Ernest Rutherford 1911 Atoms have (+) particles in the center, and are mostly empty space. (+) particles called protons, the center of atoms called the nucleus. Atomic Theory Timeline

9. Atomic Theory Timeline Scientist Information Model Neils Bohr 1913 Improved on Rutherford’s model. He proposed that electrons move around the nucleus in specific layers, or shells. Every atom has a specific number of electron shells.

10. Scientist Information Model James Chadwick 1932 Worked with Rutherford to discover particles with no charge – called neutrons. Neutrons are also found in the nucleus. Atomic Theory Timeline NEUTRONS

11. Atomic Theory Changes over time…

12. Atomic Theory Changes over time… Because Scientific evidence gathered from experiments gave scientists a better understanding of atoms

13. Think-Pair-Share! Take a minute to read the essential question as I read it aloud: “ How and why has the Atomic Theory changed over time ?” After you have jotted down your notes in the space on your guided notes, exchange your thoughts with your partner. We will have share-outs and discuss the answer.

14. http://www.brainpop.com/science/matterandchemistry/atomicmodel /

15. Atoms and Atomic Theory Essential Questions: How and why has the Atomic Theory changed over time? How can we describe the molecular motion of the states of matter?

16. Three states of matter solid liquid gas At room temperature most substances exist in one of three physical states.

17. Solids The particles in a solid are very tightly packed and vibrate in place. Solids have a definite volume and shape.

18. Particles in a solid – animation

19. Liquids The particles in a liquid are close together but can move and flow past one another. Liquids have a definite volume but they do not have a definite shape. This is why liquids like water take the shape of the container they are in. Picture was taken at the exact moment these water balloons were popped!

20. Particles in a liquid – animation

21. Gases Particles in a gas have higher amounts of energy than those in a solid or liquid. Gases do not have a definite shape or volume . When placed in a container, it fills up the entire container and spreads out as far as possible.

22. Particles in a gas – animation

23. Molecular Motion Adding heat Removing heat

24. In your groups, you will rotate clockwise after 4 minutes through the 5 stations. You will write all information on the Gallery Walk handout. Stay with your group at all times. Do not move ahead or go back, wait for the timer to move. You may discuss possible answers with your group members. Raise your hand if you need assistance after you have asked your group members.

25. Independent Practice