The instruction was most effective for the physical states of matter, shifting justifications from macroscopic to submicroscopic evidence¶

Claim · All claims
Evidence · 1 study · causal r1 · q2
Currency · newest study 2013 · not yet checked against its sources · not reviewed by a person

Subclaims¶

q2 i? Inappropriate classifications of physical states fell from n=18 at pretest to n=3 at posttest (n=6 at delayed posttest), and justifications shifted to particle arrangement and spacing. → Yakmaci-Guzel 2013

Evidence¶

Yakmaci-Guzel 2013¶

Yakmaci-Guzel, B., & Adadan, E. (2013). Use of multiple representations in developing preservice chemistry teachers' understanding of the structure of matter. International Journal of Environmental & Science Education, 8(1), 109-130. https://eric.ed.gov/?id=EJ1008597

q2 · i? · causal · r1

Frequency analysis (Table 6) shows states-of-matter misclassifications dropped from 18 to 3 after instruction and 6 at delayed posttest. The article reports many preservice teachers "included submicroscopic level evidence" such as "the distance between particles" in post and delayed posttest justifications.

"The number of scientifically inappropriate classifications for the given particulate representations with respect to their physical states was not high (n=18) before the instruction, and the frequency of scientifically inappropriate classification cases even decreased (n=3) following the instruction"

Discussion¶

Related Claims¶

• A multiple-representations instruction significantly increased preservice chemistry teachers' scientifically appropriate classifications of particulate drawings from pretest to posttest — a broader claim this one bears on
• Classifying the physical composition of matter (pure substance vs. homogeneous vs. heterogeneous mixture) was the most difficult aspect, and confusion between homogeneous and heterogeneous mixtures persisted after instruction — related
• Improvements in classifying the chemical composition of matter were not durable: some participants reverted to their initial inappropriate classifications 17 months later — related