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) ...
IB DP Chemistry: HL复习笔记5.1.3 Calorimetry
Calorimetry Measuring enthalpy changes Calorimetry is a technique used to measure changes in enthalpy of chemical reactions A calorimeter can be made up of a polystyrene drinking cup, a vacuum flas...
IB DP Chemistry: HL复习笔记5.1.2 Standard Enthalpy Change
Standard Enthalpy Change Standard conditions To compare the changes in enthalpy between reactions, all thermodynamic measurements are made under standard conditions These standard conditions are: A...
IB DP Chemistry: HL复习笔记5.1.1 Energy Changes in Reactions
Temperature & Kinetic Energy What is the difference between heat and temperature? This can be illustrated using a beaker of boiling water and a pipette: The effects of boiling water can be quit...
IB DP Chemistry: HL复习笔记4.3.6 Alloys & their Properties
Alloys Alloys are mixtures of metals, where the metals are mixed together physically but are not chemically combined They can also be made from metals mixed with nonmetals such as carbon Ions of th...
AQA A Level Maths: Pure复习笔记2.8.3 Inverse Functions
Inverse Functions What is an inverse function? An inverse function is the opposite to the original function An inverse function is denoted by The inverse of a function only exists if the fun...
IB DP Chemistry: HL复习笔记4.3.5 Trends in Melting Points of Metals
Trends in Melting Points of Metals The strength of electrostatic attraction can be increased by: Increasing the number of delocalised electrons per metal atom Increasing the positive charges on the...
