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material science unit 2 task 1

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Material assignment Element: An element is a substance made of only one type of atom, and it contains the same amount of protons, neutrons and electrons in every atom, e.g. sodium, chlorine, iron, hydrogen and potassium. Atomic symbol: Na Name: sodium 2,8,1 Relative atomic mass: 23 Atomic number: 11 Compounds: are substances made from 2 or more elements and compounds that are chemically bonded, they carry 2 or more different types of atoms they can bond in different ways like covalent, metallic, ionic, Ionic bonding Sodium atom (Na) Sodium ion it has lost an electron. Sodium reacts through ionic bonding with chlorine. Atomic symbol: Cl Name: chlorine 2,8,7 Relative atomic mass: 35 Atomic number: 17 Chlorine atom (Cl) The atoms are held together by the strong electrostatic attraction between the negative and positive charges in the 2 ions. Na 2,8 ,1 Na+ 2,8 Cl 2,8,7 Cl- 2,8,8 formula: Na+Cl- 1 H 2 He 3 Li 4 Be 5 B 6 C 7 N 8 O 9 F 10 Ne 11 Na 12 Mg 13 Al 14 Si 15 P 16 S 17 Cl 18 Ar 19 K 20 Ca 21 Sc 22 Ti 23 V 24 Cr 25 Mn 26 Fe 27 Co 28 Ni 29 Cu 30 Zn 31 Ga 32 Ge 33 As 34 Se 35 Br 36 Kr 37 ...read more.


for example: Copper (Cu) Sodium (Na) Magnesium (Mg). Metallic bonding is the attraction of metal ions e.g. Cu 2+ (Copper cation ) and the delocalised electrons. (Opposite charges attract). Cu2+ e- Cu2+ e- Cu2+ e- Cu2+ Cu2+ e- Cu2+ e- Cu2+ e- Cu2+ Cu2+ e- Cu2+ e- Cu2+ e- Cu2+ Cu2+ e- Cu2+ e- Cu2+ e- Cu2+ Cu2+ e- Cu2+ e- Cu2+ e- Cu2+ To return a compound in to its original reactant elements a chemical reaction is needed. for example to change water(H2O) to its original elements 2H (2 hydrogen ) and one O (oxygen), one must heat up the compound, once this process has taken place oxygen and hydrogen gas are given off, this is called a reverse reaction where, one can react the elements to gain a compound and then react the compound again to gain the original elements. during some reverse reactions once the point of equilibrium is reached no more reactions will take place. 2H + O (H2O) Elements are substances made from only one type of atom, these atoms all contain the same number of protons, neutrons and electrons. compounds are substances made from 2 or more types of elements, and these substances contain two or more types of atoms and they bond through different ways to gain their energetic stability, for example, metallic, ionic and covalent bonding. ...read more.


www.funsci.com/fun3_en/exper2/exper2.htm Aerosol mixtures: This is the desperation of small solid particles to dissolve in a liquid solution; although these solutions resemble a real compound solution they are not, this can be tested by: shine a light on a sol mixture, although the solid particles are very small they are still able to diffuse parts of the light, this process is called 'Tyndall' some examples of a sol mixture are: clay and water mixture. Gel mixtures: This is the desperation of small solid particles to dissolve in a liquid solution. Gel mixtures have the same characteristics as a sol mixtures in fact if you add water to a gel mixture it becomes a sol mixture and in reverse if you increase the concentration of solid materials of a sol mixture it will become a gel, solution, the only difference is it's gelatinous properties and the fact that even though a gel might be gelatinous at room temperature e.g. broth gelatine, if you heat it up it will become liquid, and vice versa but some gel mixtures will not reverse to their original state for example, the white bit in eggs, once the gelatine is heated it will take a solid state and it will not change back to its original state. * www.newi.ac.uk/buckleyc/bonding.htm-21k * www.chemguide.co.uk/atoms/bonding/ionic.html-13k- * www.wpbschoolhouse.btinternet.co.uk/page04/4_72bond.htm#molecules * http://library.thinkquest.org/11430/research/hydrogen.htm * http://answers.yahoo.com/question/index?qid=20070603081901AA6DwDQ * http://en.wikipedia.org/wiki/Methane-17k * http://kentsimmons.uwinnipeg.ca/cm1504/Image55.gif * http://qldscienceteachers.tripod.com/junior/chem/metals.html * www.corrosionsource.com/handbook/periodic/ * www.answers.com/topic/emulsion * www.funsci.com/fun3_en/exper2/exper2.htm * http://www.claytoncramer.com/weblog/2005_05_22_archive.html ?? ?? ?? ?? ...read more.

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