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Journals / Online Science Education Journal / 2026 / Cilt: 11 Sayı: 1

Development and Validation of a Two-Tier Diagnostic Test to Assess Seventh-Grade Students’ Conceptual Understanding of Pure Substances and Mixtures

Yedinci Sınıf Öğrencilerinin Saf Maddeler ve Karışımlar Konusundaki Kavramsal Anlayışlarını Değerlendirmeye Yönelik İki Aşamalı Tanılayıcı Testin Geliştirilmesi ve Geçerliğinin Sağlanması

Mehmet Mustafa Güler(ERCİYES ÜNİVERSİTESİ, EĞİTİM FAKÜLTESİ)0000-0002-7710-978X
Mustafa Metin(Erciyes Üniversitesi Eğitim Fakültesi)0000-0002-6936-510X
Pages
29–47
Publication Date
2026-06-30
DOI
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AI Summary & Key Takeaways

AI Insight
⚡ TL;DR(Too Long; Didn't Read)

The findings provide evidence supporting the instrument's use as a diagnostic tool for identifying students’ conceptual understanding, reasoning patterns, and misconceptions regarding pure substances and mixtures.

📌 3 Key Takeaways

🎯
Objective & Hypothesis:This study aimed to develop and validate a two-tier diagnostic concept test designed to assess seventh-grade students’ conceptual understanding and reasoning about this topic.
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Key Findings & Data:The study was conducted with 200 seventh-grade students from five middle schools.
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Conclusion & Impact:The findings provide evidence supporting the instrument's use as a diagnostic tool for identifying students’ conceptual understanding, reasoning patterns, and misconceptions regarding pure substances and mixtures.
🔬Design:Review & Systematic Survey
📍Scope:Comprehensive Sample
⚙️Variables:İki aşamalı tanı testi · Kavramsal Öğrenme · Saf Maddeler ve Karışımlar

Abstract

This study aimed to develop and validate a two-tier diagnostic concept test designed to assess seventh-grade students’ conceptual understanding and reasoning about this topic. The first tier consisted of multiple-choice items, whereas the second tier required students to provide open-ended explanations for their selected answers. The study was conducted with 200 seventh-grade students from five middle schools. An initial 25-item instrument was developed based on curriculum outcomes, misconceptions reported in the literature, expert review, and pilot testing. Student responses were analysed using Classical Test Theory and Rasch modelling. Item analysis identified seven items with weaker psychometric performance, resulting in a final 18-item version. The final form demonstrated acceptable item difficulty and discrimination indices, high internal consistency (Cronbach’s alpha = .879), satisfactory person and item reliability, acceptable Rasch fit statistics, and appropriate targeting between item difficulty and student ability. The findings provide evidence supporting the instrument's use as a diagnostic tool for identifying students’ conceptual understanding, reasoning patterns, and misconceptions regarding pure substances and mixtures.

Özet

Bu çalışmanın amacı, yedinci sınıf öğrencilerinin bu konuya ilişkin kavramsal anlayışlarını ve akıl yürütme süreçlerini değerlendirmek üzere tasarlanmış iki aşamalı tanılayıcı bir kavram testi geliştirmek ve geçerliğini sağlamaktır. Testin birinci aşaması çoktan seçmeli maddelerden oluşurken, ikinci aşamada öğrencilerden seçtikleri yanıtlara ilişkin açık uçlu açıklamalar yapmaları istenmiştir. Çalışma, beş ortaokuldan 200 yedinci sınıf öğrencisi ile yürütülmüştür. Başlangıçta 25 maddelik bir ölçme aracı; öğretim programı kazanımları, alanyazında bildirilen kavram yanılgıları, uzman görüşü ve pilot uygulama temel alınarak geliştirilmiştir. Öğrenci yanıtları Klasik Test Kuramı ve Rasch modellemesi kullanılarak analiz edilmiştir. Madde analizi, psikometrik performansı daha zayıf olan yedi maddeyi belirlemiş ve bunun sonucunda nihai test 18 maddelik bir forma dönüştürülmüştür. Nihai form; kabul edilebilir madde güçlük ve ayırt edicilik indeksleri, yüksek iç tutarlılık düzeyi (Cronbach alfa = .879), tatmin edici kişi ve madde güvenirliği, kabul edilebilir Rasch uyum istatistikleri ve madde güçlüğü ile öğrenci yeteneği arasında uygun hedefleme göstermiştir. Bulgular, bu ölçme aracının öğrencilerin saf maddeler ve karışımlar konusundaki kavramsal anlayışlarını, akıl yürütme örüntülerini ve kavram yanılgılarını belirlemeye yönelik tanılayıcı bir araç olarak kullanılmasını destekleyen kanıtlar sunmaktadır.

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Cite This Article

Güler, M. M., Metin, M. (2026). Development and Validation of a Two-Tier Diagnostic Test to Assess Seventh-Grade Students’ Conceptual Understanding of Pure Substances and Mixtures. Online Science Education Journal, Cilt: 11 Sayı: 1, 29–47. https://ajindex.com/articles/1637837

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