Using Error Bars The uncertainty in a measurement can be shown on a graph as an error bar This bar is drawn above and below the point (or from side to side) and shows the uncertainty in that...
Uncertainty There is always a degree of uncertainty when measurements are taken; the uncertainty can be thought of as the difference between the actual reading taken (caused by the equipment...
Orders of Magnitude A quantity is an “order of magnitude” larger than another quantity if it is about ten times larger Similarly, two orders of magnitude would be 100 times larger, or 102 &n...
Powers of Ten Physical quantities can span a huge range of values For example, the diameter of an atom is about 10–10 m (0.0000000001 m), whereas the width of a galaxy may be about 1021 m (1...
再过不久，我们将步入暑假时间，标志着属于2022的时间已经走过了一半。相信许多同学早已“未雨绸缪”，开始准备2023年的AP考试了。日前，CB也公布了2023年AP考试时间和科目安排。 除了明年的考试时间公布之外，CB还...
针对2023-24的AP学生CB开设了一门新科目：Pre-calculus 课程包括哪些内容？如何学好这门课？翰林导师的专业解读来了！ 官网：apcentral.collegeboard.org/courses/ap-precalculus 为什么要开发这门课程？ 对于每...
2022 AP考试成绩将在7月5日全球同步发送，每位考生可以通过自己的AP学生账号在线查询成绩。但拿到考试成绩不是终点，还需要留意后续的成绩相关流程。 接下来这篇文章会针对同学关心的问题：查分/送分/复议/取消/...
Separation of species by TLC Required practical 12: Separation of species by thin-layer chromatography This practical covers two key laboratory skills use thin-layer or paper chromatography safely ...
Tollens' Reagent Testing Distinguishing Between Aldehydes & Ketones Weak oxidising agents can be used to distinguish between an aldehyde and a ketone The aldehyde will be oxidised to a c...
