IMPORTANT VSAQ’S – Ist Year Chemistry(for N-TARGET) 1. What is Heisenburg uncertainity principle? 2. Significance of Ѱ & Ѱ2. 3. Difference B/w Orbit & Orbital. 4. What is shielding effect? How does it effect I.P Values. 5. What is diagonal relationship? 6. What is Lanthanide contraction? Give its consequences. 7. What types of bonds are present in NH4Cl? 8. What is dipole moment? 9. Why H2O has high B.P than HF? 10. What are Co-Ordination numbers of NaCl & CsCl. 11. Define Co-Ordinate
Premium Sodium chloride Oxygen Sodium
of graphite furnace atomic absorption over flame atomic absorption? (a) higher temperature (b) lower S/N (c) less interference (d) small sample amounts 2. In atomic emission spectroscopy‚ it is desirable to have a high concentration of the element in the form of: (a) atoms in the ground state (b) atoms in the excited state (c) ions (d) atoms as compounds 3. Which of the following atomic methods generally provide the best limit of detection? (a) Graphite furnace
Premium Spectroscopy Analytical chemistry
obtained by mining it‚ it has both acid and based characteristics‚ and it has a body centered cubic crystallization structure. Molybdenum was founded by Carl W. Scheele in 1778‚ people thought that it was graphite (lead) but then they concluded it wasn’t lead because nitric acid doesn’t react with graphite although molybdenum produced a white solid. Peter J. Hjelm reduced the white solid with carbon and heating it in a crucible to create a metallic powder he named molybdenum. The metal is most
Premium Chemical element Atom Oxygen
We take for granted much of what we have in the world today. Our basic necessities – food‚ shelter and clothing – are easily accessible to nearly everyone in the developed world‚ and things that were once considered luxury items‚ such as televisions and refrigerators‚ have become common items in even the poorest of homes. Why do we have all of these possessions so readily available to us? Leonard Read’s explanation can be found in his examination of a pencil’s life. Read considers it a miracle
Free Economics Comparative advantage International trade
Waals forces‚ more specifically‚ pi-stacking. Applied quantum chemistry‚ specifically‚ orbital hybridization best describes chemical bonding in nanotubes. The chemical bonding of nanotubes is composed entirely of sp2 bonds‚ similar to those of graphite. These bonds‚ which are stronger than the sp3 bonds found in alkanes‚ provide nanotubes with their unique strength. Types of carbon nanotubes and related structures Terminology There is no
Premium Carbon nanotube
Chemistry 30 Chemical Bonding – Properties of Molecules 1. For the following molecules determine which atoms are bonded (write the symbols with a bond between them)‚ the electronegativity difference between them‚ and the type of chemical bond it represents. If the bond is ionic‚ state what ions are produced. If the bond is polar covalent‚ indicate the direction of the dipole on the symbols from the first part. a) KCl Electronegativity difference = K - Cl = 0.8 - 3.0 = 2.2 ionic bond
Premium Covalent bond Ionic bond Atom
When it comes to golfing‚ you are only as good as your clubs. As any experienced golfer will tell you‚ your skills and technique can get you far‚ but without the right set of clubs with which to hit the ball‚ you might as well be an amateur. For most of golfing history‚ the standard set of clubs was just fine‚ but lately‚ there has been a change in way manufacturers make them‚ and that leaves a gap in your wedges. Typically‚ you would have a sand wedge and a lob wedge to help get your ball out of
Premium Steel Golf club Iron
mark the TLC plate(s) with a pencil instead of a pen because the ink from the pen might move up the plate along with the substances being separated which would contaminate and spoil the substances being examined. Since a pencil is made from graphite and graphite is not aqueous (in solution‚ i.e. it is dry) it will not adsorb or move up the plate. 10. A small
Premium Thin layer chromatography Chromatography
CHERNOBYL On April 26‚ 1986‚ a hellish white glow bejeweled a small‚ little-known town in central Ukraine‚ now notoriously recognized by the international community as Chernobyl. During the early morning hours of the twenty-sixth‚ operators had been running an ill-conceived experiment on reactor unit number four‚ during which a spike in the operating level of the core caused a catastrophic explosion. The resulting eruption of radionuclides‚ both from the initial explosion and from the subsequent
Premium Nuclear power Chernobyl disaster
fixed‚ zoom and floating. The structure is simple‚ replacement is convenient and won’t hurt cylinder. 5. Sealing equipment: there are many kinds for choice according to kiln models‚ including air cylinder edge sealing‚ spring edge sealing‚ and graphite block sealing and combination for above. The feather is adaptive for cylinder rotating and swing. And sealing effect is very good. 6. Kiln head hood: including stationary type and flexible type. Features of rotary kiln: 1. Stable function‚ low
Premium Chemical engineering Thermodynamics Heat