This study sought to determine the effect of senior secondary school students’ prior knowledge of instructional objectives on their achievement in chemistry. Three research questions and three null hypotheses guided the study. The design employed was a pretest posttest experimental design. The population was four thousand six hundred and ninety-three (4393) SS2 students who were offering chemistry in all the secondary schools in Awgu Educational Zone. Chemistry achievement test (CAT) developed by the researcher was used to collect relevant data from a sample of 184 senior sec. students selected from single sex schools in Awgu Educational Zone. The CAT was face and content validated by experts in educational measurement and evaluation and chemistry education. Reliability coefficient of 0.80 was obtained for CAT using Kuder Richardson formula -20. Mean and standard deviation scores were used to test the three null hypotheses at an alpha level of 0.05. the study revealed that students taught with prior knowledge of instructional objectives (experimental group or Wipkoiob) achieved better results than students taught without prior knowledge of instructional objective (control group or Wopkoiob) and males achieved better than the females. There is no significant interaction of gender and strategy on students’ chemistry mean achievement. The researcher therefore recommended that chemistry teachers in Nigeria should present instructional objectives in their lesson plans to their students ahead of instruction.

A novel family of macrocyclic complexes with tetra aza macro cyclic ligand and (X=Cl- , NO3-) have been synthesized and characterized by elemental analysis, IR, electronic, and EPR spectral studies. The molar conductance measurements of the complex in Dimethyl sulphoxide (DMSO)/dimethyl form amide corresponds to non-electrolytes for all the Mn(II) complexes except the complex with ligand LA which are 1:2 electrolyte. The spectra are consistent with the formula [MnLx2] and [Mn (LA) (H2O) 2] X2 and distorted octahedral geometry. The biological activity of these complexes was evaluated against different species of bacteria and plant pathogenic fungi and compared with different ligands.