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- Chemical element (8169 bytes)
1: ...into different substances by ordinary [[chemistry|chemical]] methods. The smallest particle of such an eleme...
9: ...iodic table]], which groups elements with similar chemical properties together.
15: ...tter, although at the time it was not known which chemicals were elements and which compounds. When it was l...
17: ...ur" takes the place of the British "sulphur." But chemicals which are practicable to be sold in bulk within ...
19: ...ics laboratories became able to produce nuclei of chemical elements that have too quick a decay rate to ever... - Chemical series (2075 bytes)
1: ...group of [[chemical element]]s whose physical and chemical characteristics vary progressively from one end o...
3: ...o try to organise the elements according to their chemical properties.
5: Several chemical series correspond exactly to [[periodic table gro...
7: The chemical series of the periodic table are the:
40: [[Category:Chemical element groups]] - Chemical compound (2050 bytes)
1: ... [[chemical substance]] formed from two or more [[Chemical element|element]]s, with a fixed ratio determinin...
5: ...g characteristic of a compound is that it has a [[chemical formula]]. Formulas describe the ratio of atoms ...
8: Every chemical compound that has been described in literature ca...
19: * [[chemical industry]] - Timeline of chemical element discovery (10490 bytes)
165: * [[Discoveries of the chemical elements]] - Chemical formula (5472 bytes)
1: ...e the ratio of elements in the empirical formula. Chemical formula used for a series of compounds that diffe...
6: ...]] atom bonded to four [[hydrogen]] atoms has the chemical formula:
9: ...hydrogen]] atoms and six [[oxygen]] atoms has the chemical formula:
12: ...and thus each carbon only had two hydrogens), the chemical formula may be written: CH<sub>2</sub>CH<sub>2</s...
22: The alkene 2-butene has two isomers which the chemical formula CH<sub>3</sub>CH=CHCH<sub>3</sub> does n... - Chemical bond (3955 bytes)
1: ...ld together in [[molecule]]s or [[crystal]]s. All chemical bonds are due to [[electron]]s interacting simult...
3: There are 5 different types of chemical bonds that we use to categorize atomic interactio...
5: The five types of chemical bonds:
23: These chemical bonds are ''intra''molecular forces that keep ato...
25: [[Linus Pauling]]'s book ''The Nature of the Chemical Bond'' is perhaps the most influential book on ch... - Chemical (855 bytes)
1: A '''chemical substance''' is any [[matter|material]] substance...
3: ...ing of two or more [[chemical element]]s that are chemically combined in fixed proportions.
5: ... or changed into different substances by ordinary chemical methods. The smallest particle of such an element... - Chemical equilibrium (5726 bytes)
1: ...es qualitative predictions that can be made about chemical equilibrium.
5: Without energy input chemical reactions always proceed towards equilibrium. Fo...
12: ... form it is called a [[reaction quotient]]. Since chemical reactions tend to equilibrium, if one or several ...
16: ...m can easily be derived just by considering the [[chemical kinetics|kinetics]] involved. Unlike rate equati...
18: ...be analysed by [[thermodynamics|thermodynamics]]. Chemical systems tend to equilibrium because it is the sta...
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- Periodic table (7298 bytes)
1: ... element is listed by its [[atomic number]] and [[chemical symbol]].
3: ...hemical elements|other methods for displaying the chemical elements]] for more details or different perspect...
14: ==Other methods for displaying the chemical elements==
48: ...he table. Since the outermost electrons determine chemical properties, those tend to be similar within group...
88: * [[Chemical Galaxy]] - List of elements by symbol (14812 bytes)
185: [[Category:Chemical elements|*]] - Industrial Revolution (30001 bytes)
158: ...gradually grew to include the [[chemical industry|chemical industries]], [[petroleum]] refining and distribu... - Steel (28384 bytes)
8: ...oving the oxygen by combining it with a preferred chemical partner such as carbon. This process, known as [[...
11: ...ture. Cementite is a stochiometric phase with the chemical formula of Fe<sub>3</sub>C. Cementite forms in re...
13: ...r unit cell structure to austenite, and identical chemical composition. As such, it requires extremely litt...
21: ... to the tensile strength and makes austenite more chemically stable, [[chromium]] increases the hardness, an...
110: ...] steel, which is steel that has gone through the chemical process of being hot-dipped in zinc for protectio... - Mae Jemison (5527 bytes)
5: [[Chemical engineering|Chemical engineer]], scientist, [[medicine|physician]], te...
11: ... graduated with a Bachelor of Science degree in [[Chemical Engineering]], and fulfilled the requirements for... - Marie Curie (5862 bytes)
9: ...ide on [[April 20]], [[1902]]) and then two new [[chemical element]]s. The first they named [[polonium]] aft... - Dorothy Crowfoot Hodgkin (1937 bytes)
5: ...aphy]]. She discovered the [[Analytical chemistry|chemical structure]] of [[penicillin]] in the [[1940s]], w... - Canna lily (3803 bytes)
19: ...cillus thuringiensis'', insecticidal soap, or the chemical [[malathion]] to kill the pests. In areas with a ... - Apple (20408 bytes)
121: ...mmercial orchards pursue an aggressive program of chemical sprays to maintain high fruit quality, tree healt...
157: ...provide the extracts to study the effects of phytochemicals. Lee said that all apples are high in the critic... - Respiratory system (5107 bytes)
33: ...lungs every minute. The lungs add and remove many chemical messengers from the blood as it flows through pul... - Endocrine system (3152 bytes)
1: ...a control system of ductless glands that secrete chemical messengers called [[hormone]]s that circulate wit... - Actinium (7046 bytes)
20: | [[Chemical series]] || [[Actinide]]s
130: '''Actinium''' is a [[chemical element]] in the [[periodic table]] that has the ...
141: ...ndependently discovered actinium in [[1902]]. The chemical behavior of actinium is similar to that of the ra... - Gastrointestinal tract (16596 bytes)
39: ...ized into smaller portions, and slight amounts of chemical processing takes place, especially on protein, by...
55: ...the gastrointestinal tract do a lot of the actual chemical work of digesting for us.
83: ...to other parts of the body for storage or further chemical change. As already noted, this part of the proces...
99: ...absorbed from the small intestine is the class of chemicals called [[vitamin]]s. The two different types of ...
118: ...the brain or from the spinal cord. They release a chemical called [[acetylcholine]] and another called [[adr... - Digestion (4206 bytes)
1: ...ty processes a substance, in order to [[chemistry|chemically]] convert the substance into [[nutrient]]s. Dig...
3: ...tion usually involves mechanical manipulation and chemical action. In most [[vertebrate]]s, digestion is a ...
9: ... with [[digestive fluid]] to further decompose it chemically. As the [[pH|acidic level]] changes in the stom...
27: ...ther organisms, usually invertebrate animals, and chemically digest them. [[Fungus|Fungi]] also are very eff... - Colon (anatomy) (1808 bytes)
22: ...e intestine produces no digestive enzymes — chemical digestion is completed in the small intestine bef... - Eye (21834 bytes)
22: ...) light rays onto the retina. This light causes [[chemical]] changes in the photosensitive cells of the reti... - Retina (13061 bytes)
14: ...it the photoreceptors (right layer). This elicits chemical transformation mediating a propagation of signal ...
29: ...ached away in bright light and only replaced as a chemical process, so in a transition from bright light to ... - Bone (11388 bytes)
6: ...ial]], formed mostly of calcium phosphate (in the chemical arrangement termed calcium hydroxyapatite), which...
23: ...-junctions. They contain alkaline phosphatase - a chemical which has a role in the mineralisation of bone. - Pituitary gland (3020 bytes)
7: ...rmones. It does this in response to a variety of chemical signals from the hypothalamus, including TRH, CRH... - Pineal gland (4403 bytes)
23: ...imethyltryptamine]], or '''DMT'''. This endogeous chemical in the human brain is believed to play a role in ...
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