This study aims to determine the increase in learning outcomes using thequizizz-assisted zoom application in chemistry learning during the Covid-19pandemic. This research is quantitative research with a population of allstudents of SMA Pelita Kasih and the sample using the True Experimentalmethod takes the Pretest - Posttest Control Group Design. The analysis testwas carried out using paired t-test and n-gain score. The results showed anincrease in learning outcomes using the quizizz-assisted zoom application inchemistry learning during the Covid-19 pandemic with ttable (1.69) tcount (10.12)and sig 0.05 (df = 31). Gain test results were obtained by 54.68% in themedium category, so it can be concluded that learning with the Quizizzapplication is effective in improving cognitive abilities and encouragingstudents to interact and compete towards better competencies.

This research is a quantitative study which aims to determine the results differences of the 2nd National Chemistry Olympiad at the public and private senior high school using quizizz media. All participants of the population were sampled in the determination, the sampling technique used was saturated samples. The results of the prerequisite test on the data from this study showed that the data were normally and homogeneous. For normality and homogeneity tests, obtained sig > 0.05. Data analysis using SPSS 24, carried out One Way Anova test, obtained sig.0.01 with a significance level of 5%, these results indicate that there are differences in the results of the 2nd National Chemistry Olympiad (OKN) level is low, the public high school participants results with an average score of 59.48 and private high schools with an average score of 41.95 by utilizing Quizizz media. Keywords: Chemistry, Olympics, Learning, Quizizz