mankind’s quest for further knowledge and understanding. Much time has been spent looking for some clues. Most of what we know is still only a speculation. The three topics I’d like to discuss are what exactly the Big Bang theory is‚ the first atoms‚ and the age of the universe. What exactly is the Big Bang theory? “Fifteen billion years ago a tremendous explosion started the expansion of the universe‚ known as the Big Bang.” (LaRocco and Rothstein‚ n.d.) The Big Bang theory is an effort to
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"Quantum Mechanics" ~ Bohr’s model was inefficient for atoms other than hydrogen or poly-electronic atoms ~ This new approach to a model of the atom focused on the concept of wave functions ~ Since electrons are particles and therefore have wave properties ~ Schrodinger viewed the electron as a standing wave ~ Standing waves must have whole numbers of half wavelengths in any motion ~ As an electron‚ this means that the hydrogen atoms could only have certain circular orbits with a circumference
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another‚ covalent bonds share the electrons with each other and polar covalent bonds are in between covalent and ionic bonds which means that polar ionic bonds can either share or transfer the electrons‚ also polar covalent bonds are mostly around the atom instead of the other bonds that stay in
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Form A Chemistry 100 Introduction to General Chemistry Fall Semester‚ 2010 Exam One‚ 150 points On this page print your name‚ your lab section number‚ and the name of your TA. Also sign this test booklet. Name________________________________Lab section____________TA___________ Signature________________________________________________________________ The exam consists of 21 problems and one extra credit problem. Partial credit is given only for work that is legible and logically and clearly
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compounds with the same molecular formula‚ but different atom connectivity. C2H6O Two different compounds with different physical & chemical properties: Ethyl alcohol (ethanol): B.P. 78.5 oC (liquid) M.P. –117.3 oC Reacts with alkaline metals. Dimethyl ether: -24.9 oC (gas!) -138 oC Does not How many isomers can you draw for: C4H10O C4H8O 3. Chemical Bonds Ionic: forms by a complete transfer of one or more electrons from one atom to another to form ions (cation and anion). Forms between
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Chemical Bonding Chemical compounds are formed by the joining of two or more atoms. A stable compound occurs when the total energy of the combination has lower energy than the separated atoms. The bound state implies a net attractive force between the atoms ... a chemical bond. The two extreme cases of chemical bonds are: Covalent Bonds Covalent chemical bonds involve the sharing of a pair of valence electrons by two atoms‚ in contrast to the transfer of electrons in ionic bonds. Such bonds lead to
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I have learned from this project is that everyone is original and vary from each other. This was a fun project‚ I got to display who I am and present the things that really mean the most to me‚ and why they are important. Each time I presented to a new person‚ I tried to enthrall them with my own originality. People read my symbols in the way I expected them too because‚ there were very little questions‚ some did have an egregious look on their face when I said I like to dance. If I could do this
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The increase in volume corresponding to increase in temperature and α-β phase transition can be clearly seen by comparing ATOMS 7&8 with ATOMS 9&10. In the β phase‚ the atoms are more spread out. While time-averaged Fe-O distances decrease with increasing temperature due to the increasing disorder at high temperature arising from excited low-energy‚ high-amplitude vibrations‚ instantaneous Fe-O distances
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sample is converted to a gaseous phase atoms or ions Atomic absorption spectroscopy is based on the same principle as the flame test used in qualitative analysis. When an alkali metal salt or a calcium‚ strontium or barium salt is heated strongly in the Bunsen flame‚ a characteristic flame colour is observed: Na -- yellow Li-- crimson Ca-- brick red Sr-- crimson Ba --green In the flame‚ the ions are reduced to gaseous metal atoms. Compound -------- heat------- atoms The high temperature of the flame
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molecule Mass spectrometer converts sample into ions‚ and that these ions can be further fragmented (broken down) into smaller molecules. Ionisation can be achieved using various different techniques‚ electron ionisation‚ chemical ionisation and Fast atom bombardment. When sample is ionised the analyser portion of the mass spectrometer seperates the molecules based on their mass to charge ratio. A dector then detects the molecule weight of all the molecules present and a spectrum is obtained. Base
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