How do I find the gradient of a straight line? Find two points that the line passes through with coordinates (x1, y1) and?(x2, y2) The gradient between these two points is calculated by This is giv...
Binomial Theorem What is the Binomial Theorem? The?binomial theorem (sometimes known as the binomial expansion) gives a method for expanding a?two-term?expression in a bracket raised to a power A?b...
Edexcel IGCSE Chemistry 復習筆記 4.3.2 Halogens & Alkanes Halogens & Alkanes In a substitution reaction, one atom is swapped with another atom Alkanes undergo a substitution reaction...
Language of Proof ?What is proof? Proof is a series of logical steps which show a result is?true?for all specified numbers ‘Seeing’ that a result works for a few numbers is not enough to?show?that ...
Edexcel IGCSE Chemistry 復習筆記 4.3.1 Alkanes The Alkanes Alkanes are a group of?saturated?hydrocarbons The term saturated means that they only have single carbon-carbon bonds, there are no...
Edexcel IGCSE Chemistry 復習筆記 4.2.4 Cracking Cracking Saturated molecules contain?single?bonds only whereas unsaturated molecules contain?double?bonds between their carbon atoms Alkanes?a...
Compound Interest What is compound interest? Interest is a small percentage paid by a bank or company that is added on to an initial investment Interest can also refer to an amount paid on a loan o...
Edexcel IGCSE Chemistry 復習筆記 4.2.3 Nitrogen Oxides & Sulfur Dioxide Formation of Nitrogen Oxides Nitrogen Oxides These compounds (NO and NO2) are formed when nitrogen and oxygen reac...
Edexcel IGCSE Chemistry 復習筆記 4.2.2 Combustion Fuels & Combustion The combustion of fossil fuels is the major source of atmospheric pollution Fossil fuels include:?coal,?oil,?natural ...
