“…The pre-test results of the experimental group EURASIA J Math Sci and Tech Ed 9 / 13 and control group indicated that respondents' understanding of chemistry concepts such as the structure of the atom and acids and bases concepts was low. This outcome is parallel with other studies reported earlier (Cetin-Dindar & Geban, 2017;Demircioglu et al, 2005;Levy Nahum, Hofstein, Mamlok-Naaman, & Bar-Dov, 2004;Muhamad Damanhuri, Treagust, Won, & Chandrasegaran, 2016) whereby students have a low understanding of chemistry concepts mentioned above.…”