LE SITE D'AIDE A LA DISSERTATION ET AU COMMENTAIRE DE TEXTE EN PHILOSOPHIE

EXEMPLES DE RECHERCHE


POUR LE SUJET: L'homme est-il réellement libre ?
TAPEZ LES MOTS-CLES: homme libre

POUR LE SUJET: En quel sens la société libère-t-elle l'homme de la nature ?
TAPEZ LES MOTS-CLES: homme nature ou homme nature société
»Créer un compte Devoir-de-philo
»
»125895 inscrits

Toutes les dissertations

Bohrium - chemistry.

Bohrium - chemistry. Bohrium, symbol Bh, chemical element with atomic number 107. It is produced artificially by nuclear fusion (in which an element with larger atoms is produced by fusing together smaller atoms of other elements). Each bohrium atom has a very large nucleus, or central mass, containing positively charged particles called protons and neutral particles called neutrons....

1 page - 1,80 ¤

Boron - chemistry.

Boron - chemistry. Boron, symbol B, hard, brittle semimetallic element with an atomic number of 5. Boron is in group 13 (or IIIa) of the periodic table (see Periodic Law). Compounds of boron, notably borax, have been known since early times, but the pure element was first prepared in 1808 by the French chemists Joseph Gay-Lussac and Baron...

1 page - 1,80 ¤

Bromine - chemistry.

Bromine - chemistry. I INTRODUCTION Bromine, symbol Br, poisonous element that at room temperature is a dark, reddish-brown liquid. In group 17 (or VIIa) of the periodic table (see Periodic Law), bromine is one of the halogens. The atomic number of bromine is 35. II PROPERTIES AND OCCURRENCE Bromine is widely distributed in...

1 page - 1,80 ¤

Cadmium - chemistry.

Cadmium - chemistry. I INTRODUCTION Cadmium, symbol Cd, silvery-white metallic element that can easily be shaped. The atomic number of cadmium is 48; the element is one of the transition elements in group 12 (or IIb) of the periodic table (see Periodic Law). II PROPERTIES AND OCCURRENCE Cadmium was discovered in 1817 by...

1 page - 1,80 ¤

Calcium - chemistry.

Calcium - chemistry. I INTRODUCTION Calcium, symbol Ca, reactive, silvery-white metallic element. In group 2 (or IIa) of the periodic table (see Periodic Law), calcium is one of the alkaline earth metals. The atomic number of calcium is 20. The British chemist Sir Humphry Davy isolated calcium in 1808 by means of electrolysis. II

1 page - 1,80 ¤

Californium - chemistry.

Californium - chemistry. Californium, symbol Cf, artificially created radioactive element with an atomic number of 98. Californium is one of the transuranium elements in the actinide series of the periodic table (see Periodic Law). The isotope of californium with a mass number of 245 was first produced in 1950 at the University of California laboratories in Berkeley by...

1 page - 1,80 ¤

Carbon - chemistry.

Carbon - chemistry. I INTRODUCTION Carbon, nonmetallic chemical element, known by the symbol C, that is the fundamental building block of material in living organisms and is important to many industries. Carbon occurs in nature in nearly pure form in diamond and graphite. It is also the major component of coal, petroleum, asphalt, limestone, and most

5 pages - 1,80 ¤

Cerium - chemistry.

Cerium - chemistry. Cerium, symbol Ce, soft, gray metallic element that is the most abundant of the rare earth elements. Cerium is in the lanthanide series of the periodic table (see Periodic Law); its atomic number is 58. Cerium was discovered in 1803 by the Swedish chemists Baron Jöns Jakob Berzelius and Wilhelm Hisinger, and in the same...

1 page - 1,80 ¤

Cesium - chemistry.

Cesium - chemistry. Cesium, symbol Cs, white, soft, chemically reactive metallic element. In group 1 (or Ia) of the periodic table (see Periodic Law), cesium is one of the alkali metals. The atomic number of cesium is 55. Cesium was discovered in 1860 by the German chemist Robert Wilhelm Bunsen and the German physicist Gustav Robert Kirchhoff through...

1 page - 1,80 ¤

Chlorine - chemistry.

Chlorine - chemistry. Chlorine, symbol Cl, greenish-yellow gaseous element. The element's name comes from the Greek word chloros, which means "pale green." In group 17 (or VIIa) of the periodic table (see Periodic Law), chlorine is one of the halogens. The atomic number of chlorine is 17. Elementary chlorine was first isolated in 1774 by the Swedish chemist...

1 page - 1,80 ¤

Chromium - chemistry.

Chromium - chemistry. I INTRODUCTION Chromium, symbol Cr, gray metallic element that can take on a high polish. The atomic number of chromium is 24; the element is one of the transition elements of the periodic table (see Periodic Law). II PROPERTIES AND OCCURRENCE The element was discovered in 1797 by the French...

1 page - 1,80 ¤

Cobalt - chemistry.

Cobalt - chemistry. Cobalt, symbol Co, silvery-white, magnetic, metallic element used chiefly for making alloys. The atomic number of cobalt is 27; it is one of the transition elements of the periodic table (see Periodic Law). Cobalt was discovered in about 1735 by Swedish chemist George Brandt. It has a relatively low strength and little ductility at normal...

1 page - 1,80 ¤

Copper (element) - chemistry.

Copper (element) - chemistry. I INTRODUCTION Copper (element), symbol Cu, brownish-red metallic element that is one of the most widely used of metals. Copper is one of the transition elements of the periodic table (see Periodic Law). The atomic number of copper is 29. Copper was known to prehistoric people and was probably the first metal...

2 pages - 1,80 ¤

Curium - chemistry.

Curium - chemistry. Curium, symbol Cm, radioactive element with an atomic number of 96. Curium is one of the transuranium elements in the actinide series of the periodic table (see Periodic Law). Curium is radioactively unstable and does not exist in nature. Curium was first produced synthetically by the American chemists Glenn T. Seaborg, Ralph A. James, and

1 page - 1,80 ¤

Darmstadtium - chemistry.

Darmstadtium - chemistry. Darmstadtium, symbol Ds, chemical element with atomic number 110. It is produced artificially by nuclear fusion (in which an element with larger atoms is produced by fusing together smaller atoms from other elements). Each darmstadtium atom has a very large nucleus, or central mass, containing positively charged particles called protons and neutral particles called neutrons....

1 page - 1,80 ¤

Deuterium - chemistry.

Deuterium - chemistry. Deuterium, stable, nonradioactive isotope of hydrogen with atomic weight 2.01363 and symbol D, or 2H. It is commonly called heavy hydrogen because its atomic weight is approximately double that of ordinary hydrogen, but it has identical chemical properties. Deuterium has about twice the atomic weight of normal hydrogen because its nucleus contains a proton and...

1 page - 1,80 ¤

Dubnium - chemistry.

Dubnium - chemistry. Dubnium, symbol Db, chemical element with atomic number 105, produced artificially by nuclear fusion (in which an element with larger atoms is produced by fusing together two smaller atoms from other elements). Each dubnium atom has a very large nucleus, or central mass, containing positively charged particles called protons and neutral particles called neutrons. The...

1 page - 1,80 ¤

Dysprosium - chemistry.

Dysprosium - chemistry. Dysprosium, symbol Dy, metallic element with an atomic number of 66. Dysprosium is one of the rare earth elements in the lanthanide series of the periodic table (see Periodic Law). The element was discovered in 1886 by Paul Émile Lecoq de Boisbaudran, who separated one of its compounds from an oxide of holmium. The element's

1 page - 1,80 ¤

Einsteinium - chemistry.

Einsteinium - chemistry. Einsteinium, symbol Es, artificially created radioactive element with an atomic number of 99. Einsteinium is one of the transuranium elements in the actinide series of the periodic table (see Periodic Law). The element was named in honor of German-born American physicist Albert Einstein. Einsteinium was discovered in 1952 by American chemist Albert Ghiorso and colleagues...

1 page - 1,80 ¤

Element 112 - chemistry.

Element 112 - chemistry. Element 112, also called ununbium (Uub), chemical element with atomic number 112. It is produced artificially by nuclear fusion (in which an element with larger atoms is produced by fusing together smaller atoms from other elements). Each ununbium atom has a very large nucleus, or central mass, containing positively charged particles called protons and...

1 page - 1,80 ¤

Element 114 - chemistry.

Element 114 - chemistry. Element 114, also called ununquadium (Uuq), chemical element with atomic number 114. Each atom of the element has a nucleus, or central core, containing positively charged particles called protons and neutral particles called neutrons (see Atom). The number of protons in the nucleus of an atom of any element determines the element's atomic number....

1 page - 1,80 ¤

Element 116 - chemistry.

Element 116 - chemistry. Element 116, also called ununhexium (Uuh), chemical element with atomic number 116. Each ununhexium atom has a nucleus, or inner core, containing particles called neutrons and protons (see Atom). The number of protons in the nucleus of an atom determines the element's atomic number. The nucleus of an atom of ununhexium, therefore, contains 116...

1 page - 1,80 ¤

Erbium - chemistry.

Erbium - chemistry. Erbium, symbol Er, metallic element, whose atomic number is 68. The Swedish chemist Carl Gustav Mosander discovered erbium in 1843. Erbium occurs mostly in the same minerals and in the same areas as dysprosium. The elements erbium, terbium, yttrium, and ytterbium were all named for the town of Ytterby in Sweden, the location of a...

1 page - 1,80 ¤

Europium - chemistry.

Europium - chemistry. Europium, symbol Eu, soft, silvery metallic element that is among the least abundant of the rare earth elements. Europium is in the lanthanide series of the periodic table (see Periodic Law); its atomic number is 63. Europium was first detected spectroscopically, and was imperfectly isolated by the French chemist Eugène Demarçay in 1901. It ranks...

1 page - 1,80 ¤

Fermium - chemistry.

Fermium - chemistry. Fermium, symbol Fm, artificially created radioactive element with an atomic number of 100. Fermium is one of the transuranium elements in the actinide series of the periodic table (see Periodic Law). The element was isolated in 1952 from the debris of a hydrogen bomb explosion by the American chemist Albert Ghiorso and coworkers. Subsequently fermium...

1 page - 1,80 ¤

1 2 3 4 5 6 ... 5661 5662 5663 5664 5665 5666 5667 5668 5669 5670 5671 5672 5673 5674 5675 5676 5677 5678 5679 5680 5681 5682 5683 5684 5685 5686 5687 5688 5689 5690 5691 5692 5693 5694 5695 5696 5697 5698 5699 5700 5701 5702 5703 5704 5705 5706 5707 5708 5709 5710 5711 5712 5713 5714 5715 5716 5717 5718 5719 5720 5721 5722 5723 5724 5725 5726 5727 5728 5729 5730 5731 5732 5733 5734 5735 5736 5737 5738 5739 5740 5741 5742 5743 5744 5745 5746 5747 5748 5749 5750 5751 5752 5753 5754 5755 5756 5757 5758 5759 5760 5761 5762 5763 5764 5765 5766 5767 5768 5769 5770 5771 5772 5773 5774 5775 5776 5777 5778 5779 5780 5781 5782 5783 5784 5785 5786 5787 5788 5789 5790 5791 5792 5793 5794 5795 5796 5797 5798 5799 5800 5801 5802 5803 5804 5805 5806 5807 5808 5809 5810 ... 14048 14049 14050 14051 14052 14053

150000 corrigés de dissertation en philosophie

 Maths
 Philosophie
 Littérature
 QCM de culture générale
 Histoire
 Géographie
 Droit
Podcast philo