AQA A Level Maths: Pure复习笔记2.9.1 Translations
Translations What are graph transformations? When you alter a function in certain ways, the effects on the graph of the function can be described by geometrical transformations With a transl...
IB DP Chemistry: HL复习笔记5.3.1 Bond Enthalpy
Bonds & Energy When bonds are broken or made enthalpy changes take place A chemical bond is a force of attraction between two atoms Breaking the bond requires the input of energy it is therefor...
IB DP Chemistry: HL复习笔记5.2.4 Using ∆Hf° to Find Enthalpy Changes
Using ∆Hf° to Find Enthalpy Changes Standard Enthalpy of Formation is defined as “The enthalpy change when one mole of a compound is formed from its elements under standard conditions” We can use e...
IB DP Chemistry: HL复习笔记5.2.3 Using Hess's Law - Equations
Hess's Law using Equations We can use Hess’s Law to solve unknown enthalpy changes by combining equations This requires a methodical step-by-step approach It is necessary to identify how the given ...
AQA A Level Maths: Pure复习笔记2.8.5 Modulus Functions - Solving Equations
Modulus Functions - Solving Equations Modulus graphs and equations Two non-parallel straight-line graphs would intersect once If modulus involved there could be more than one intersection De...
IB DP Chemistry: HL复习笔记5.2.2 Using Hess's Law - Cycles
Hess's Law using Cycles There are two common methods to solving Hess's Law problems, using cycles and using equations To be successful in using cycles you need to follow carefully a step-by-step pl...
IB DP Chemistry: HL复习笔记5.2.1 Hess's Law
Hess's Law In 1840, the Russian chemist Germain Hess formulated a law which went on to be known as Hess’s Law This went on to form the basis of one of the laws of thermodynamics. The first law of t...
IB DP Chemistry: HL复习笔记5.1.4 Calorimetry Experiments
Calorimetry Experiments There are two types of calorimetry experiments you need to know for IB Chemistry: Enthalpy changes of reactions in solution Enthalpy changes of combustion In both cases you ...
AQA A Level Maths: Pure复习笔记2.8.4 Modulus Functions - Sketching Graphs
Modulus Functions - Sketching Graphs Modulus functions The modulus function makes any ‘input’ positive |x| = x if x ≥ 0 |f(x)| = f(x) if f(x) ≥ 0 |x| = -x if x < 0 |f(x)| = -f(x) ...
