to say that H2O has a “covalent bond”‚ let’s look at the definition of a covalent bond: A covalent bond is a chemical bond that involves the sharing of electron pairs between atoms. The stable balance of attractive and repulsive forces between atoms when they share electrons is known as covalent bonding. For many molecules‚ the sharing of electrons allows each atom to attain the equivalent of a full outer shell‚ corresponding to a stable electronic configuration. (Source: http://en.wikipedia.org/wiki/Covalent_bond)
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very different. In the Energy Story‚ the author tells us that we use a lot of energy and in a lot of different things. They tell us how the structure of the atom looks and how the number of protons‚ electrons‚ and neutrons affect how much energy that element can produce. If there are more electrons the element does not conduct any energy and if there are more
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portion of moving electrons the nucleus is very small as compared to the entire atom the positively charged core of an atom. 1 HISTORY OF NUCLEUS Based on Thomson’s discovery of the electron‚ Thomson suggested that atoms were spheres of positively charged matter with negatively charged‚ electrons embedded in them. Later one of his students ernest Rutherford came up with the idea that atoms should consist of a tiny but massive positive nucleus with electrons circling outside
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Properties of Substances- Gr.12 Chemistry Final Lab Report Lab: Properties of Substances M. Nguyen SCH4U April 27‚ 2012 Abstract The purpose of this experiment was to use a variety of tests to identity the type of bonds which are present in each solid. Various substances (paraffin wax‚ sucrose‚ sodium chloride‚ tin‚ and silicon dioxide) were experimented and identified with tests for hardness‚ solubility‚ conductivity‚ and the time for the solid to melt with a candle and Bunsen burner
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by four strong covalent bonds leaving no free electrons and no ions. That’s why diamond does not conduct electricity Graphite is soft because they are built in layers. Graphite is a good electrical conductor because each carbon atom is bonded into its layer with three strong covalent bonds. This leaves each atom with a spare electron‚ which together form a delocalised ‘sea’ of electrons loosely bonding the layers together. These delocalised electrons can all move along together – making graphite
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Latihan 5: Magnetism Magnetic Fields 1. An electron gun fires electrons into a magnetic field directed straight downward. Find the direction of the force exerted by the field on an electron for each of the following directions of the electron’s velocity: (a) horizontal and due north; (b) horizontal and 30° west of north; (c) due north‚ but at 30° below the horizontal; (d) straight upward. 2. (a) Find the direction of the force on a proton moving through the magnetic fields in Figure
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Homework #2 1. How many electrons would a typical neon element have? How many electrons does a typical lithium element have? Use that information to qualitatively describe the difference between the emission spectrum of neon and lithium. 10‚ 3‚ the greater the number of electrons the greater the number of emission lines on the spectrum 2. The dominant element present in the star’s spectrum to the right: Hydrogen 3. Is a toaster oven filament an example of an emission‚ absorption
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Planning In this piece of coursework‚ I am going to investigate what affects the resistance of a piece of wire. Wire is made up of atoms. Electric current is a flow of electrons‚ and it is these electrons that collide with the nucleus of the atoms. Every time this happens‚ it causes resistance. The build up of friction is what produces the heat. There are many variables that could affect the resistance of the piece of wire: Length Potential difference Tension Temperature Diameter
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To measure conductivity we needed to understand the dissociation of ionic bonds. When two oppositely charged atoms bond together there is a transfer of an electron(s) from a cation to the anion. This occurs because the cation is willing to give up an electron to obtain 8 electrons in their valence shell where as the anion is accepting the electron to fulfill its valence shell. When compounds containing ionic bonds are dissolved in water‚ the ions dissociate from one another. This dissociation causes
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scuff electrons from your hair onto the comb. Is your hair then positively or negatively charged? How about the comb? -The hair becomes positively charged and the comb becomes negatively charged; since‚ the electrons went from your hair to the comb and the more electrons there is makes an object more negative. 18) It is relatively easy to strip the outer electrons from a heavy atom like that of uranium (which then becomes a uranium ion)‚ but it is very difficult to remove the inner electrons. Why
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