CONTENTS 



Exercise Page 



1. Does Gas Occupy Space? 15 



2. Comparison of English and Metric Systems. 16 



3. Does Gas Have Weight? 19 



4. Diffusion of Liquids 21 



5. Diffusion of Liquids through a Membrane . . 22 



6. Diffusion of Gases 25 



7. Diffusion of Gases (Demonstration) 26 



8. Mixing of Alcohol and Water 27 



9. Effect of Heat on Solids 28 



10. Effect of Heat on Liquids 29 



11. Effect of Heat on Gases 31 



12. Cohesion, Adhesion, and Gravity 32 



13. Thermometers 34 



14. Measurement of the Heat of a Flame 35 



15. Change from a Solid to a Liquid 38 



16. Solution 39 



17. Change from Liquid to Solid 40 



18. Change from a Liquid to a Gas 41 



19. Effect of Pressure on Boiling Point 42 



20. How Water is Distilled 43 



21. Evaporation 44 



22. Physical Change 45 



23. Chemical Change 46 



24. Mechanical Mixture 47 



25. Chemical Synthesis. 48 



26. Chemical Analysis ". 49 



27. Carbon 50 



28. Phosphorus (Demonstration) 51 



7 



