The study examined the effect of using advance Organizer on secondary school students’ performance in and Attitude towardsChemistry in Ekiti State. The pre-test, post-test control group quasi-experimental design was adopted for this study. The population for the study comprised of 19,603 Senior Secondary Schools Two (SS2) students in 189 public Secondary Schools in the three senatorial districts across the sixteen (16) Local Governments Areas (LGAs) of Ekiti State. The sample for this study consisted of 144 SS2 chemistry students found in intact classes of the schools selected for the study. The two instruments used for study were Chemistry Performance Test (CPT) and Chemistry Attitudinal Scale (CAS). The instruments were subjected to content and face validity. The reliability of instrument was determined through the test re-tests method and reliability coefficients of 0.87 and 0.85 were obtained for CPT and CAS respectively which were believed to be high enough to adjudge the instruments as internally consistent, stable and reliable enough for use. The experimental procedure use in the study was in three stages: the pre-treatment stage (one week), the treatment stage (four weeks) and post treatment stage (three weeks), making a total of eight weeks for the study. The results of the data collected from both pre-test and post-test were collated and analyzed using descriptive and inferential statistics. Each of the hypotheses was tested at 0.05 level of significance. The findings revealed that the use of an advance organizer had positive effect on students’ performance, and attitude towards learning of Chemistry.

Keywords: Advance Organizer, Learning Outcomes, Retention, Academic Performance. Attitudes,

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