<![CDATA[Abstract The aims of this study were to determine whether there was the difference learning outcome between students which were given immediate feedback accompanied by reward and delay feedback accompanied by reward and investigate the effectiveness of immediate feedback accompanied by reward in XI IPA learning outcome at SMAN 1 Sungai Ambawang. This study used quasi-experimental research with the matcing-only pretest-postest control group design. The sample of this research were 25 students from XI IPA 2 as experimental class and 28 students from XI IPA 1 as control class. The result showed that the average gain score in the experimental class was 82,2 and in the control class was 57,23. According to t-independent test with = 5%, there was a significant difference learning outcome between students which were given immediate feedback accompanied by reward and delay feedback accompanied by reward (0,000<0,05). This strategy had 34,85% effect which was categorized as Excellent to the learning outcome. Keywords: Immediate Feedback, Delay Feedback, Reward, Acid base.]]>
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