Contents xv 



CHAPTER PAGE 



10. CHEMICAL CHANGE AND ENERGY .... 293 



46. What things are made of : Elements . -293 



47. Burning: Oxidation ..... 312 



48. Chemical change caused by heat . -323 



49. Chemical change caused by light . .326 



50. Chemical change caused by electricity . 335 



51. Chemical change releases energy . . 340 



52. Explosions 342 



11. SOLUTION AND CHEMICAL ACTION . . .349 



53. Chemical change helped by solution . . 349 



54. Acids . . 351 

 55- Bases . 355 



56. Neutralization 360 



57. Effervescence 365 



12. ANALYSIS 370 



58. Analysis 370 



APPENDIXES : 



A. The Electrical Apparatus .... 379 



B. Construction of the Cigar-box Telegraph . 381 



INDEX 383 



