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U.S. HISTORY
Era 1: Three Worlds Meet (Beginnings to 1620) Era 2: Colonization and Settlement (1585-1763) Era 3: Revolution and the New Nation (1754-1820s) Era 4: Expansion and Reform (1801-1861) Era 5: Civil War and Reconstruction (1850-1877) Era 6: The Development of the Industrial United ..
The Deciduous Forests
The Deciduous Forests - Also referred as "Temperate deciduous forests" are found in temperate regions of North central Europe, Eastern Asia and Eastern United States. In southern hemisphere in Australia and New Zeala..
Face centered cubic
A face centered cubic unit cell has one atom at each corner and one atom at each face center, being shared by two unit cells and making a Hence, a face centered cubic unit cell has,..
A face centered cubic unit cell has one atom at each corner and one atom at each face center, being shared by two unit cells and making a Hence, a face centered cubic unit cell has,..Types of Solutions
A solution can be solid, liquid or a gas depending upon the physical state. The various types of solutions ar..
A solution can be solid, liquid or a gas depending upon the physical state. The various types of solutions ar..U.S. HISTORY
Living and Working Together in Families and Communities, Now and Long Ago The History of Students' Own State or Region The History of the United States: Democratic Principles and Values and the People from Many Cultures who Contributed to its Cultural, Economic, an..
Occurrence
In free state, sulphur occurs in the volcanic regions of Sicily, Italy, South America, Japan and Russia. The largest deposits of sulphur have been found in Louisiana and Texas (USA). In combined state, sulphur occurs mainly as the sulphides and sulphates. Sulphi..
Case 1
For cubic crystals of elements (e.g., Fe, Cu) Let edge length = a pm Number of atoms per unit cell = Z Atomic mass of the element = M Volume of Unit cell = (a pm) 3 = a 3 x 10 - 3 0 cm Mass of unit cell = Number of atoms per unit cell x Mass of ..
For cubic crystals of elements (e.g., Fe, Cu) Let edge length = a pm Number of atoms per unit cell = Z Atomic mass of the element = M Volume of Unit cell = (a pm) 3 = a 3 x 10 - 3 0 cm Mass of unit cell = Number of atoms per unit cell x Mass of ..Examples of Hydrogen Bonding
In hydrogen fluoride, hydrogen atom is bonded to highly electronegative atom, fluorine (electronegativity = 4). It has been found that in solid state hydrogen fluoride consists of long zig-zag chains of H-F molecules associated by H-bonds. On heating, progressively, the length of th..
Race to the Moon
As soon as rockets could break away from the earth's gravity, moon became the next goal. Russians took the lead landing their spacecraft LUNA-3 which photographed the far side of moon in 1959. Meanwhile, the United States launched 11 unmanned moon missions without a single..
Tetrahedral Voids
A simple triangular void in a crystal is surrounded by four spheres. fig 2.11 - A unit cell of simple cubic packing fig 2.11 - (a) Tetrahedral vo..
A simple triangular void in a crystal is surrounded by four spheres. fig 2.11 - A unit cell of simple cubic packing fig 2.11 - (a) Tetrahedral vo..See what our Users say :
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