00448nam a2200109Ia 4500008004100000100002600041245013000067260004800197300001100245650001400256856006800270160712s9999    xx            000 0 und d  a Macale, Aprhodite M.  cAprhodite M. Macale, Elisa S. Baccay, Liza C. CarascalaDevelopment and Validation of Word Problems in Chemistry Gas Concepts  c2011bAlipato: A Journal of Basic Education  avol. 5  xEDUCATION  uhttp://journals.upd.edu.ph/index.php/ali/article/view/2692/2522