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One term, and every place the course uses it — the revision notes that teach it, the multiple choice questions that check it, and the detailed questions that examine it.
17 sub-topics use electrolysis
Edexcel · Chemistry · 3 Chemical changes
3.3Electrolysis
positive electrode (the anode). Ions are discharged at the electrodes producing elements. This process is called electrolysis. Electrolyte A molten or dissolved ionic compound in which the ions are free to move, so it conducts electricity
in The process of electrolysis and 5 other sections
Edexcel · Chemistry · 4 Extracting metals and equilibria
4.1Reactivity and extracting metals
Metals can be extracted from molten compounds using electrolysis. Electrolysis is used if the metal is too reactive to be extracted by reduction with carbon, or if the metal reacts with carbon. Large amounts of energy
in Using electrolysis to extract metals and 3 other sections
Edexcel · Chemistry · 4 Extracting metals and equilibria
4.2Recycling and life cycle assessment
Used in 12 questions on this sub-topic.
Edexcel · Chemistry · 5 Separate chemistry 1
5.6Chemical cells and fuel cells
fuel to store Where the energy comes from Hydrogen is often made from fossil fuels or by electrolysis, which needs energy The electricity used to recharge may come from fossil fuels Infrastructure Few refuelling stations exist
in Fuel cells
Edexcel · Chemistry · 2 States of matter and mixtures
2.2Separating and purifying mixtures
Used in 8 questions on this sub-topic.
Edexcel · Chemistry · 1 Key concepts in chemistry
1.5Types of substance and their properties
Used in 3 questions on this sub-topic.
Edexcel · Chemistry · 5 Separate chemistry 1
5.5The Haber process and fertilisers
Used in 3 questions on this sub-topic.
Edexcel · Chemistry · 1 Key concepts in chemistry
1.1Atomic structure and isotopes
Used in 4 questions on this sub-topic.
Edexcel · Chemistry · 8 Fuels and Earth science
8.2Combustion and atmospheric pollutants
dioxide, and carbon monoxide and soot if combustion is incomplete Renewable? Can be made from water by electrolysis Non-renewable, from crude oil Storage Must be stored as a compressed gas or a very cold liquid
in Hydrogen as a fuel for cars
Edexcel · Chemistry · 3 Chemical changes
3.2Reactions of acids and making salts
Used in 3 questions on this sub-topic.
Edexcel · Chemistry · 5 Separate chemistry 1
5.3Yield and atom economy
Used in 2 questions on this sub-topic.
Edexcel · Chemistry · 6 Groups in the periodic table
6.2Group 7: the halogens
solution of a reactive metal's compound is electrolysed. Oxygen appears at the anode in the electrolysis of aqueous solutions without halide ions, and when hydrogen peroxide decomposes. Carbon dioxide appears whenever a carbonate meets
in Test for chlorine
Edexcel · Chemistry · 8 Fuels and Earth science
8.5The greenhouse effect and climate change
Used in 1 question on this sub-topic.
Edexcel · Chemistry · 5 Separate chemistry 1
5.1Transition metals, alloys and corrosion
Electroplating coats an object with a thin layer of another metal, using electrolysis. It is done for two reasons, and a question usually wants both: to improve the appearance of the object, and to protect
in Electroplating
Edexcel · Chemistry · 9 Separate chemistry 2
9.5Nanoparticles and materials
Used in 2 questions on this sub-topic.
Edexcel · Chemistry · 8 Fuels and Earth science
8.3Fuels and cracking
Used in 1 question on this sub-topic.
Edexcel · Chemistry · 9 Separate chemistry 2
9.1Tests for ions and instrumental analysis
Used in 1 question on this sub-topic.