Universal Learning House

This article envisages bond enthalpies (bond energies) and looks at some simple calculations involving them. One of the most confusing things about this is the way the words are used. These days, the term "bond enthalpy" is normally used, but we will also find it described as "bond energy" - sometimes in the same article. An even older term is "bond strength". So we can take all these terms as being interchangeable. As we will see below, though, "bond enthalpy" is used in several different ways, and we might need to be careful about this. Explaining the terms Bond dissociation enthalpy and mean bond enthalpy Simple diatomic molecules A diatomic molecule is one that only contains two atoms. They could be the same (for example, Cl 2 ) or different (for example, HCl). The  bond dissociation enthalpy  is the energy needed to break one mole of the bond to give separated atoms - ...

Atomic Symbols Deduce the number of protons, neutrons and electrons in the following species: 1.     1 1 H 2.     17 8 O 3.     4 2 He 2+ 4.     132 54 Xe 5.   27 13 Al 3+ 6.   235 92 U 7.   1 1 H + 8.   45 21 Sc 3+ 9.   37 17 Cl - 10. 14 6 C Use the periodic table to write symbols for the following species: 11. 19 protons, 20 neutrons, 18 electrons 12. 8 protons, 8 neutrons, 10 electrons 13. 1 proton, 2 neutrons, 1 electron 14. 82 protons, 126 neutrons, 80 electrons 15. 53 protons, 74 neutrons, 54 electrons

 There is no denying the fact that a n electron can be transferred from one neutral (uncharged) atom to another. When this happens, the atom from which the electron is transferred becomes a positive ion or cation and the atom to which the electron is transferred becomes a negative ion or anion. The transfer of an electron to or from an atom involves energy. The energy required to remove one electron from an atom is characteristic of the atom and is its ionization energy. The energy released when an electron is acquired by an atom is its electron affinity. The electron transfer can take place with a release of energy only when the electron affinity of the receiving species is greater than the ionization energy of the donating species, which is rarely the case, or, most often, when the resulting ions associate themselves into a new configuration of lower energy. Most electron transfer reactions occur when the ions once formed associate themselves into structured lattices called ion...

My friend, my foes My Friend, My Foes My friend, my foes entail equal beam, As if Love is  like a universal outcry, To burn itself  with a thousand lives, Amid dislocations between life and death, To survive in peaceful, discerning oceans. Like the drops of water laden with salty foam, Hidden in the clouds beneath the icy water, For the sake of uniting the low ebb inside the depth, To clarify the rhyme of the watery crustacean. Friendship, society and love tie humans, Even the lower animals like the birds and beasts, In the herbs of the woodland, the kingfisher in ponds, All have food chains underneath the water and in the sky.

There is no denying the fact that food tourism is about much more than just enjoying a good meal, a pint of beer, or a glass of wine during a trip. It is a way of immersing ourselves into the culture and heritage of a region, making the experience memorable in a completely unique and personal way. According to Tecumseh, “When you rise in the morning, give thanks for the light, for your life, for your strength. Give thanks for your food and for the joy of living. If you see no reason to give thanks, the fault lies in yourself”. A single twig breaks, but the bundle of twigs is strong. There are only three things women need in life: food, water, and compliments and according to Chris Rock, “the success of this sector is linked to an increasingly noticeable trend: the search for authentic experiences among the growing number of travellers who are tired of tourism for tourists.” For all businesses linked to gastronomy, culture, and tourism, this co uldn't be a better ...

Some common elements and their corresponding colors are: Symbol Name Color Image Al Aluminum Silver-white , in very hot such as an electric arc, light blue As Arsenic Blue B Boron Bright green Ba Barium Pale/Apple green Be Beryllium White Bi Bismuth Azure Ca Calcium Orange Cd Cadmium Brick red Ce Cerium Blue Co Cobalt Silver-white Cr Chromium Silver-white Cs Caesium Blue- Violet Cu(I) Copper (I) Bluish-green Cu(II) Copper(II) (non- halide ) Green Cu(II) Copper(II) (halide) Blue-green Ge Germanium Pale blue Fe(II) Iron (II) Gold , when very hot such as an electric arc, bright  blue , or green turn...