EDEXCEL IGCSE CHEMISTRY: DOUBLE SCIENCE 复习笔记：1.3.2 Calculate Relative Atomic Mass Calculate Relative Atomic Mass The relative atomic mass of each element is calculated from the m...
EDEXCEL IGCSE CHEMISTRY: DOUBLE SCIENCE 复习笔记：1.3.1 Atoms: Definitions & Structure Atoms & Molecules It is important to understand the terms atom and molecule when referring to a...
Structure of Bacteria & Viruses Bacteria Bacteria are small, single-celled prokaryotes Prokaryotic cells are much smaller than eukaryotic cells They also differ from eukaryotic cells in having ...
EDEXCEL IGCSE CHEMISTRY: DOUBLE SCIENCE 复习笔记：1.2.5 Practical: Investigating Paper Chromatography Practical: Investigate Paper Chromatography Using Inks & Food Colourings Objective: Investi...
高三学生的SAT答题纸被快递弄丢！ 被迫重新考试！影响早申！救命！ 55份SAT答题纸在高速公路丢失 据CNN报道称，美国德州El Paso地区一辆UPS快递车辆，在高速公路上运输学生SAT答卷途中，不知何故车厢后门敞开，答...
EDEXCEL IGCSE CHEMISTRY: DOUBLE SCIENCE 复习笔记：1.2.4 Interpreting Chromatograms Identifying Mixtures Pure substances will produce only one spot on the chromatogram If two or more substanc...
Polymerase Chain Reaction Every person, with the exception of identical twins, has a unique DNA sequence which can be used to create a DNA profile This is very useful in forensic science as it prov...
Micro-organisms: Decomposition & Nutrient Recycling Dead plants and animals are broken down by microorganisms such as bacteria and fungi These organisms are known as decomposers These decompose...
Determining the Time of Death Forensics is the use of science in the investigation of criminal activities It involves the collection and analysis of evidence from a potential crime scene e.g. the s...
