英国私立寄宿学校解读!
英国教育可以分两个系统:公立教育和私立教育。这两种教育主要区别在于, 公立教育系统里学校的财政开支和管理由中央政府或者当地政府进行管控。大部分公立学校为走读学校, 全英共有39所公立寄宿制学校, 但这些...
英国教育可以分两个系统:公立教育和私立教育。这两种教育主要区别在于, 公立教育系统里学校的财政开支和管理由中央政府或者当地政府进行管控。大部分公立学校为走读学校, 全英共有39所公立寄宿制学校, 但这些...
USACO 美国计算机奥林匹克学术活动 United States of America Computing Olympiad 简称USACO,USACO学术活动是美国最具认可度的计算机学术活动,用于选拔美国参加全球信息奥林匹克学术活动(IOI)的国家队,学术...
Bond Energy During a reaction, enthalpy changes take place because bonds are being broken and formed Energy (in the form of heat) is needed to overcome attractive forces between atoms Bond breaking...
Electron Pairs The valence shell electron pair repulsion theory (VSEPR) predicts the shape and bond angles of molecules Electrons are negatively charged and will repel other electrons when close to...
State Changes Changes of state are physical changes that are reversible These changes do not change the chemical properties or chemical makeup of the substances involved Vaporization includes evapo...
Mole & Avogadro Constant The Avogadro constant (NA or L) is the number of particles equivalent to the relative atomic mass or molecular mass of a substance The Avogadro constant applies to atom...
Relative Masses Atomic Mass Unit The mass of a single atom is so small that it is impossible to weigh it directly Atomic masses are therefore defined in terms of a standard atom which is called the...
Structure of an Atom All matter is composed of atoms, which are the smallest parts of an element that can take place in chemical reactions Atoms are mostly made up of empty space around a very smal...
Recombinant DNA Technology Recombinant DNA The genetic code is universal, meaning that almost every organism uses the same four nitrogenous bases – A, T, C & G. There are a few exceptions The g...
Genome Sequencing Projects A genome contains all of the genes within an organism Advances in technology have allowed scientists to map and sequence the genes within an organism's genome Genome sequ...
Totipotent Cells A stem cell is a cell that can divide (by mitosis) an unlimited number of times Each new cell that is produced when a stem cell divides has the potential to remain a stem cell or t...
Gene Mutations A gene mutation is a change in the sequence of base pairs in a DNA molecule that may result in an altered polypeptide Mutations occur continuously and spontaneously Errors in the DNA...
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