IGCSE Glossary
There are 11 entries in this glossary.Glossaries
Term | Main definition |
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Acid |
Glossaries - GCSE chemistry
Glossaries Description -
A substance with a pH value of less than 7 and which releases hydrogen ions (H+(aq)) when in water. Examples of acids are :HCl (hydrochloric acid), H2SO4 (Sulfuric acid), HNO3 (Nitric acid)
Hits - 2500
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activation energy |
Glossaries - GCSE chemistry
Glossaries Description -
The least possible amount of energy required to start a reaction.
Hits - 2459
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Albert Einstein |
Glossaries - GCSE chemistry
Glossaries Description -
Albert Einstein 14 March 1879 – 18 April 1955) was a German-born theoretical physicist, widely acknowledged to be one of the greatest physicists of all time. Einstein is known for developing the theory of relativity, but he also made important contributions to the development of the theory of quantum mechanics. Relativity and quantum mechanics are together the two pillars of modern physics.
Hits - 1159
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Alexander Graham Bell |
Glossaries - GCSE chemistry
Glossaries Description -
Alexander Graham Bell (; born Alexander Bell, March 3, 1847 – August 2, 1922) was a Scottish-born inventor, scientist, and engineer who is credited with inventing and patenting the first practical telephone.
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aluminium carbonate |
Glossaries - GCSE chemistry
Glossaries Description -
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ammonia |
Glossaries - GCSE chemistry
Glossaries Description -
Ammonia is a compound of nitrogen and hydrogen with the formula NH3. Ammonia is a colourless gas with a distinct pungent smell. It is a common nitrogenous waste, particularly among aquatic organisms, and it contributes significantly to the nutritional needs of terrestrial organisms by serving as a precursor to 45 percent of world's food and fertilizers
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ammonium sulfate |
Glossaries - GCSE chemistry
Glossaries Description -
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anode |
Glossaries - GCSE chemistry
Glossaries Description -
the positive electrode in an electrolysis circuit
Hits - 2492
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Atmosphere |
Glossaries - GCSE chemistry
Glossaries Description -
An atmosphere is a layer of gas or layers of gases that envelope a planet, and is held in place by the gravity of the planetary body. A planet retains an atmosphere when the gravity is great and the temperature of the atmosphere is low.
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atom |
Glossaries - GCSE chemistry
Glossaries Description -
The smallest particle of an element which still retains all the properties of the element
Hits - 3545
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Atomic number |
Glossaries - GCSE chemistry
Glossaries Description -
The number of protons in the nucleus of an atom. Also known as the proton number.
Hits - 3251 Synonyms -
Proton number |