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 I 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 , 3 8 3 



