polar region the water vapor may be .001 percent. 7. Box A is a compound because there are 2 molecules of one compound made up of two different elements. Box B is a mixture because there are 2 atoms of one element plus 2 atoms of another element. Box C is a mixture because there are three different substances, two elements, and a compound. Part D is an element because there are 4 of the same elements. 8. The masses of the reactants and the products are the same. They are
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meter, about the size of six carbon atoms or less than one water molecule almost too small to imagine (Williams & Adams). Nano technology is the science of interacting with atoms and molecules to modify the way they behave; for example by chemical creating Ferro fluids or liquid magnets the exhibit strange behavior due to external magnetic fields. Or by fabricating Nano scale semiconductor crystals known as quantum dots which are sometimes called artificial atoms that glow like Christmas lights.
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with diagram. Covalent bonds – when 2 atoms share electrons Ionic bond – the transfer of one or more electrons from one atom to another Hydrogen bond – formed between a hydrogen atom in one molecule and another atom, often an oxygen or nitrogen 2. What are the major differences among proton, neutron and electrons? What is isotope? Carbon has six protons, if it receives one additional proton will it be remain as carbon? If not, what would be new element? Protons are positively charged particles
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determination of chemical elements employing the absorption of optical radiation (light) by free atoms. It is capable of measuring the concentrations of a wide variety of element in sample. In AAS method measures the light absorbed by the very large proportion of atoms in the ground state. It is a widely used technique due to its simplicity, effectiveness, and relatively low cost. Atomic-absorption (AA) spectroscopy uses the absorption of light to measure the concentration of gas-phase atoms. Since samples
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.... 6 What is Synoptic? ........................................................................................... 6 Will I have to learn everything? ........................................................................ 6 A Synoptic Carbon Atom .................................................................................. 6 Which Content is Synoptic? .............................................................................. 8 How to use the16:3:3:3 Rule ........................
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Alcohols and alkyl halides are similar because they both contain an electronegative element bonded to a sp3 hybridized carbon atom. However, they are also dissimilar alkyl halides has a leaving group (X-) while alcohols do not. Nucleophilic substitution with ROH as starting material would displace –OH, a strong base and therefore a poor leaving group (McMurry, 2012). Structure (Smith) The OH group must be first converted into a better leaving group for an alcohol to undergo a nucleophilic substitution
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for water? Page Ref: 10.4 4) What is the correct Lewis structure for Br2? Page Ref: 10.4 5) What is the correct Lewis structure for N2? Page Ref: 10.4 6) How many valence electrons are in the nitrate ion? Page Ref: 10.5 7) The central atom in the chlorate anion, ClO3- is surrounded by Page Ref: 10.5 8) What is the correct Lewis structure for CO2? Page Ref: 10.5 9) Which of the following compounds have resonance structures? CH4 H2O Page Ref: 10.6 NH3 O3 10) What is the
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tendency of an atom to attract electrons in the formation of an ionic bond. An atoms's electronegativity is affected by both its atomic number and the distance that its valence electrons reside from the charged nucleus. The higher the associated electronegativity number, the more an element or compound attracts electrons towards it. Trend--As one moves from left to right across a period in the periodic table, the electronegativity increases due to the stronger attraction that the atoms obtain as
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evidence of how one thing led to another. Hydrogen is found to be the most abundant element in the universe (97%) and comprises the core of most stars. Stars are seen as fusion furnaces forming (creating), at the least, the elements of the periodic table up to iron. Science finds that 99.6% of the human body is comprised of 11 elements. 54 trace elements make up the rest of the body. We are made of star dust. Each atom in our bodies is at least 5 billion years old. I wonder where all they have been
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questions that are rarely touched by economic theorists despite their obvious importance for our understanding of economic processes in the world. No fully formalized model will be proposed here. Instead, the focus will be on interaction between economic elements and emergence of structures. These ideas have been successfully elaborated in natural science by physicists. That is why it makes sense to look for some analogies between physical and economic concepts, and then to find ways of employing principles
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