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You need to know the 3 rules for electrolysis then it’s easy to work out 

At the cathode

Whether hydrogen or a metal is produced at the cathode depends on the position of the metal in the metal reactivity series:

the metal is produced at the cathode if it is less reactive than hydrogen
hydrogen is produced at the cathode if the metal is more reactive than hydrogen

At the anode

Oxygen is produced unless halide ions (chloride, bromide or iodide ions) are present. In that case, the negatively charged halide ions lose electrons and form the corresponding halogen (chlorine, bromine or iodine).

Science

Can someone help explain the process of electrolysis?

Useful energy out divide by total energy in x 100 

So 2100 divided by 6000 = 0.35

0.35 x 100 = 35%

A diesel engine uses 6000J of chemical energy and does 2100J of work.

Filtration - used to separate an insoluble solid solid from a solution 
Distillation - used to separate a substances with different boiling points 
Chromatography - used to separate inks and dyes 
Evaporation/crystallisation - used to separate a soluble solid from a solution 

What are separation techniques for science

Use YouTube videos kayscience does this very well.

Draw images for certain concepts to help you understand the text in visual format

How exactly do I revise gcse science for a visual learner like myself?

Science compulsory do triple science if that is an option if that is available to you 

What subjects do I take at college if I want to be a rheumatologist?

What type of circuit is it series or parallel and how many bulbs do you have?

If the voltmeter reads 3V what will the voltage be across each bulb?

Most of the food we eat is complex carbohydrates, proteins and lipids. These must be broken down to be absorbed into the body.

The chemical reactions required to break them down would be too slow without enzymes.

Enzymes are biological catalysts – they speed up chemical reactions.

Enzymes are required for most of the chemical reactions that occur in organisms. These reactions occur in the breakdown of chemical molecules, which we see in the digestive system.

Enzymes are also involved in the building up of chemical molecules elsewhere in the body.

Enzymes are proteins that have a complex 3D-shape. Each enzyme has a region called an active site.

The substrate – the molecule or molecules taking part in the chemical reaction – fits into the active site. Once bound to the active site, the chemical reaction takes place .

In an organism, the active site of each enzyme is a different shape. It is a perfect match to the shape of the substrate molecule, or molecules. This is essential to the enzyme being able to work. One enzyme is therefore specific to one substrate's chemical reaction, or type of chemical reaction.

This theory for the way in which enzymes work is called the lock and key theory.


Biology

What is the structure of enzymes

So you need to compare the advantages and disadvantages of both methods

Biofuels
Renewable source.Uses land that could be used to grow food.
Less carbon emissions. When burned, they release as much carbon as they absorbed during growth, although some carbon dioxide will be released during production, eg by the tractor.Needs a lot of labour.
Reduce our reliance on fossil fuels.Bioethanol cannot be used in cars without modifying the engine.

Wind turbines

Renewable sourceExpensive to build
Cheap to run (no fuel costs)Visual pollution (spoils the view)
No polluting gases producedNoise pollution (very noisy)
Unreliable (depends on the strength of the wind)


A farmer plans to generate all the electricity  needed on her farm using either a biogas generator or a small wind turbine the biogas generator would burn methane gas the methane gas would come from the rotting the animal waste produced on the farm

Physics is the natural science that studies matter, its motion and behavior through space and time, and the related entities of energy and force. Physics is one of the most fundamental scientific disciplines, and its main goal is to understand how the universe behaves.

Physics

What is physics

In order to begin training as an airline pilot, you’ll generally need at least 5 GCSEs from A to C, with English and Maths included. You will also need at least two A-levels, and ideally this will include Maths and Physics. Although a University degree is not required, it is extremely useful if you are in possession of a degree in a related field such as Aviation Management or Aircraft Engineering. These courses typically provide a good introduction to the theoretical side of pilot training.

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