Halogens: Oxidising Agents Halogens react with metals by accepting an electron from the metal atom to become an ion with 1- charge Eg. Ca (s) + Cl2 (g) → CaCl2 (s) consisting of Ca2+ and ...
马歇尔学会是剑桥大学的经济学会，马歇尔经济学会写作比赛（Marshall Society Essay Competition）是面向A-level、IB和其他体系学生打造的写作比赛，要求学生利用现实世界的相关论据对经济理论进行充分解释和合理...
Uses of Group 2 Three different calcium compounds are used commonly in agriculture, construction and iron extraction: Limestone - this is impure calcium carbonate Quicklime - this is calcium...
Reactions of Group 2 The group 2 elements react with oxygen, water and dilute acids Group 2 Reactions - Observations Reactions with water and oxygen The reaction of group 2 metals wit...
Solubility of Hydroxides & Sulfates Group 2 hydroxides Going down the group, the solutions formed from the reaction of group 2 oxides with water become more alkaline When the oxides are ...
今天，CollegeBoard正式放出了SAT机考样题，并采取直播方式对机考模式进行讲解，同时，首次正面回应了黄牛考位问题，小编一起来和大家分享下。 在今年1月份，CB宣布SAT进入机考时代，国际考场在2023年春季率先使...
Trend: Melting Point Melting points of the elements across period 3 A pattern is a little harder to see from the data, but you can see that it rises and falls: Melting points of the period 3...
Trend: First Ionisation Energy The first ionisation energy (IE1) is the energy required to remove one mole of electrons from one mole of atoms of an element in the gaseous state to form one ...
Trend: Atomic Radius Elements in the periodic table are arranged in order of increasing atomic number and placed in vertical columns (groups) and horizontal rows (periods) The elements acros...
