EDEXCEL IGCSE CHEMISTRY: DOUBLE SCIENCE 復(fù)習(xí)筆記：4.2.3 Nitrogen Oxides & Sulfur Dioxide Formation of Nitrogen Oxides Nitrogen Oxides These compounds (NO and NO2) are formed when nitroge...
Practical: Investigating Biodiversity Using Sampling Use of sampling techniques in fieldwork Sampling is a method of investigating the?abundance and distribution of species and populations There ar...
EDEXCEL IGCSE CHEMISTRY: DOUBLE SCIENCE 復(fù)習(xí)筆記：4.2.1 Crude Oil & Fractional Distillation Crude Oil & Fractional Distillation Crude oil as a mixture is not a very useful substance ...
Drawing Cells From Blood Smears To record the observations seen under the microscope (or from photomicrographs taken) a labelled biological drawing is often made Biological drawings?are line pictur...
Practical: Dissection of Gas Exchange Surfaces in Fish & Insects The safe use of instruments for the dissection of an animal or plant organ Dissections are a?vital part?of scientific research T...
Practical: Aseptic Techniques When investigating the effect of antimicrobial substances on microbial growth it is essential that?aseptic (sterile) techniques?are used Aseptic techniques ensure the ...
Practical: Ethical Use of Organisms The safe and ethical use of organisms to measure plant or animal responses or physiological functions When using?live animals?in biological experiments, care mus...
Drawing Conclusions Evaluating experimental results?and?drawing conclusions?from them are two very important skills Evaluation of?results?is a?different skill?from evaluation of the experimental?pr...
Mathematical Analysis of Results Quantitative investigations of variation can involve the interpretation of mean values and their standard deviations A?mean?value describes the average value of a d...
