85473842-kimia.doc - 1 CHAPTER 2:THE STRUCTURE OF THE ATOM...

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CHAPTER 2:THE STRUCTURE OF THE ATOM 2.1 MATTER : (refer text book pg 11) 1. Particle Theory of Matter : Matter is made up of …………………… and ……………….. particles. 2. The tiny particles may be atoms, ……………….. and ………………………. 3. Kinetic Theory of matter : Matter consists of small particles that always collide among each other. The particles move faster when energy is ……………… and slower when they are …………. 4. Change of states of matter based on Kinetic Theory: State of matter Solid Liquid Gas Draw the particles arrangement Particles arrangement The particles are …………….together in an ……………. manner The particles are ………… but not in …………. The particles are …………….. apart from each other. Particles movement Particles can only …………..and …….. About their fix positions Particles can ………, ………… and ………. throughout the liquid Particles can …………., ……………… and ……… freely Attractive forces between the particles Very …………………, …………….. between particles Strong ……………… between particles but then the forces in solid. …………………. Forces between particles Kinetic energy of particles …………………….. ………………………. ……………………… 1 1
5. When heat energy is supplied to particles in matter, its kinetic energy (increased/decreased) and the particles in matter vibrate ( faster/ slower) When matter loses heat energy, the kinetic energy of the particles (increased/decreased) and they vibrate ( faster/ slower). 6. ( A ) ( B ) ( C ) ( D ) A …………………… B ……………………… C…………………… D……………………. 7. The temperature at which a ………………………………. Completely changes to become a liquid is called ……………………………….. 8. Explanation on the heating process of matter (refer text book 15) point States of matter explanation A to B B to C C to D 9. Explanation on the cooling process of matter 2 2 SOLID LIQUID GAS A B C D Temperature O C Times/s
Point State of matter Explanation P to Q Q to R R to S Freezing point : The temperature at which a …………………… changes into ……………. During the freezing process, the temperature remains unchanged because the heat lost to the environment is ………….. by the heat released when the liquid particles rearrange themselves to become solid. 2.2 THE ATOMIC STRUCTURE The Historical Development Of Atomic Models 3 3 Temperature O C Times/s A B C D
Complete all the blanks and draw the structure of each atomic model. Model Structure Characteristic Dalton’s atomic model (proposed by ………………in …………) The atom was imagined as a small indivisible ball similar to a very tiny ball. Thomson’s atomic model (proposed by ……………… in………..) J.J Thomson discovered the………., a negatively-charged particle. The atom was describe as a sphere of positive charge embedded with electrons. Rutherford’s atomic model (proposed by ………………… in ……….) Ernest Rutherford discovered ………, a positively-charged particle in an atom. The central region of atom has a very small positively-charged ……………, which contains almost all the mass of the atom.

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