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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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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borrows one or more electrons from another atom. An ionic bond is a type of chemical bond that occurs when one atom loses an electron to form a positive ion and the other atom gains an electron to form a negative ion‚ which then result in attraction. 2. What is a covalent bond? A covalent bond is a bond that occurs when atoms in a molecule share a pair of electrons. For example‚ “the atoms in sugar do not form ions; instead‚ they are held together because of shared electrons.” 3. Do you think
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the graphs available. 1. Have the light source turned on at very low intensity and battery set to ZERO volts. Vary the wavelength of the light source (from Infra Red to Ultra Violet) until electrons just begin to be ejected from the sodium surface. State the wavelength and note the speed of the electrons. What is the corresponding frequency of the electromagnetic wave? Why is it called threshold frequency? 2. Repeat the instruction 1 above but allow the light to shine on the metal for a longer
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