Practical Skill: Control of Variables & Uncertainty Enzyme rate experiments are experiments that are carried out to determine the effect of changing a particular factor on the rate of a ...
Students should be able to: Appreciate the Models & Functions of Enzyme Action Models of enzyme action Scientists often use models to explain their observations from experiments As techn...
Edexcel IGCSE Maths 复习笔记 2.3.2 Expanding Two Brackets - Harder Hidden FOIL (aka spot the hidden brackets) Always write (a + b)2 as (a + b)(a + b) Beware of minus signs Remember the basic rules:...
Enzyme Inhibitors An enzyme's activity can be reduced or stopped, temporarily, by a reversible inhibitor There are two types of reversible inhibitors: Competitive inhibitors have a similar s...
Rate: Substrate Concentration The greater the substrate concentration, the higher the rate of reaction: As the number of substrate molecules increases, the likelihood of enzyme-substrate com...
Rate: Enzyme Concentration Enzyme concentration affects the rate of reaction The higher the enzyme concentration in a reaction mixture, the greater the number of active sites available and the grea...
Maths Skill: Calculating pH If the hydrogen ion (H+) concentration of a solution is known, the pH can be calculated using the equation: pH = -log₁₀ [H⁺] You can find the ‘log’ function on yo...
Edexcel IGCSE Maths 复习笔记 2.3.1 Expanding Two Brackets - Basics What is expanding two brackets? When we expand brackets in algebra we ‘get rid of’ the brackets by multiplying out When we expand ...
Rate: pH All enzymes have an optimum pH or a pH at which they operate best Enzymes are denatured at extremes of pH Hydrogen and ionic bonds hold the tertiary structure of the protein (ie. th...
Rate: Temperature Enzymes have a specific optimum temperature – the temperature at which they catalyse a reaction at the maximum rate Lower temperatures either prevent reactions from proceed...
Edexcel IGCSE Maths 复习笔记 2.2.2 Simple Factorisation What is simple factorisation? Simple Factorisation is the opposite of Expanding One Bracket Beware of minus signs Remember the basic rules: “...
Maths Skill: Using a Tangent to Find Initial Rate of Reaction For linear graphs (i.e. graphs with a straight-line), the gradient is the same throughout This makes it easy to calculate the ra...
