EDEXCEL IGCSE CHEMISTRY: DOUBLE SCIENCE 复习笔记：2.3.3 Combustion Combustion Combustion is the scientific word for burning All combustion reactions involve a chemical change in which oxygen...
EDEXCEL IGCSE CHEMISTRY: DOUBLE SCIENCE 复习笔记：2.3.2 Practical: Determine the % of Oxygen in Air ractical: Determine the Percentage of Oxygen in Air Aim: To determine the percentage of oxygen in...
EDEXCEL IGCSE CHEMISTRY: DOUBLE SCIENCE 复习笔记：2.3.1 Composition of Air Composition of Air The proportion of gases in the air has not changed much in 200 million years About four fifths o...
EDEXCEL IGCSE CHEMISTRY: DOUBLE SCIENCE 复习笔记：2.2.1 Group 7 (Halogens) Physical Properties The elements in group 7 are known as the halogens These are fluorine, chlorine, bromine, iodine...
EDEXCEL IGCSE CHEMISTRY: DOUBLE SCIENCE 复习笔记：2.1.1 Group 1 (Alkali Metals) How Alkali Metals React with Water The group 1 metals are known as the alkali metals They form alkaline soluti...
EDEXCEL IGCSE CHEMISTRY: DOUBLE SCIENCE 复习笔记：1.7.4 Giant Covalent Structures Giant Covalent Structures Covalent bonding can be responsible for substances that have many different struct...
作为顶级媒体，纽约时报关注到学生写作的重要性，并在全年推出一系列写作学术活动供学生们选择参加。每位“小作家”都能在含金量极高的纽约时报写作学术活动中找到适合自己的类别。 11月份即将开始的是纽约时报系列...
EDEXCEL IGCSE CHEMISTRY: DOUBLE SCIENCE 复习笔记：1.7.3 Simple Molecular Structures Simple Molecular Structures Simple molecular structures have covalent bonds joining the atoms together, bu...
EDEXCEL IGCSE CHEMISTRY: DOUBLE SCIENCE 复习笔记：1.7.1 Formation of Covalent Bonds Formation of Covalent Bonds Non-metal atoms can share electrons with other non-metal atoms to obtain a ful...
《纽约时报》 New York Times（NYT）是美国最大的本地都市报，也是美国三大报纸之一。纽约时报系列写作比赛是《纽约时报》举办的，全年滚动开展。如果学生投稿文章，能够得到评委的青睐乃至获奖，登上该报刊，无...
2023年香港AP报名于2022年10月13日上午9:00正式开始。截至目前，距离2023年AP考试中国香港考区报名通道关闭还有2天的时间，还未报名的同学要抓紧时间啦！ 香港AP考点最新动态 部分满额科目新增考试名额 常规考试...
小伙伴们，今年的AMC10和12A卷刚刚落下帷幕，大家发挥得怎么样？AMC10和AMC12表现优异者可以参加AIME邀请赛哦~ 今天在这里为大家解析部分AMC10/12A卷真题及答案解析！ AMC10A卷真题： 解析： 已知的5个数，其和为...
