Current‚ Voltage and Power * Electricity is the flow of electric charge. We can describe the flow of electric charge in several ways. These include the quantities Current‚ Voltage and Power. Current * Current (I) is the rate of flow of Charge Carriers‚ such as electrons. Current is usually thought of as moving in the direction of positive charge‚ so from the positive power supply to the negative. However‚ since in metals it is electrons that carry electric charge‚ the actually flow is opposite
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the universe. * Substances made up of more than one type of atom are called mixtures. * Mixtures are made up of groups of atoms called molecules. * Molecules that are made of one type of atom are called simple molecules. Examples: O3 ‚ N2 ‚ S8 * Molecules that are made of more than one type of atom are called compound molecules.
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Scribd Extrascore Sample Questions - Answers Q.1: What are the µlaws of chemical combination¶? Ans: There are two important laws of chemical combination established by Lavoisier‚are as follows: (i) Law of Conservation of Mass The law of conservation of mass states that mass can neither be created nor destroyedin a chemical reaction.(ii) Law of Constant Proportions The Law of Constant Proportions which is also known as the Law of DefiniteProportions‚ was established by Proust
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each case‚ tell whether cis and trans exist. If they do‚ write the structural formulas for two isomers and label each cis or trans‚ (a) Br2CH2 : No (b) CH3CH2CH=CHCH2CH3: Yes (c) CH3CH=CHCH3: Yes (d) CH2=CHCH2CH3:No 31) Which of these molecules can have cis and trans isomers? For those that do‚ write the structural formulas of these two isomers and label each cis or trans. For those that cannot have these isomers‚ explain why. (a) CH3CH2BrC=CBrCH3 (b) (CH3)2C=C(CH3)2 (c) CH3CH2 lC=ClCH2CH3
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Balancing Chemical Equations Answer Key Vocabulary: coefficient‚ combination‚ compound‚ decomposition‚ double replacement‚ element‚ molecule‚ product‚ reactant‚ single replacement‚ subscript Prior Knowledge Questions (Do these BEFORE using the Gizmo.) [Note: The purpose of these questions is to activate prior knowledge and get students thinking. Students are not expected to know the answers to the Prior Knowledge Questions.] The scouts are making s’mores out of toasted marshmallows‚ chocolate
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This is because the magnesium not only reacted with the oxygen and the nitrogen in the air but also with the porcelain of the crucible. The reason for waiting for the crucible to cool before weighing it was because at higher temperatures‚ the molecules inside are still active‚ causing the weight to be off. During Trial 2‚ the magnesium was not properly burned off and caused the calculations to be off. The magnesium looked as if it had stopped glowing‚ but the inside coil was not completely
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three-dimensional arrangement of the atoms that constitute a molecule. It determines several properties of a substance including its reactivity‚ polarity‚ phase of matter‚ color‚ magnetism‚ and biological activity.[1][2] The angles between bonds that an atom forms depend only weakly on the rest of molecule‚ i.e. they can be understood as approximately local and hence transferable properties. The specific three dimensional arrangement of atoms in molecules is referred to as molecular geometry. We also define
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(2) The molecular shape of a molecule with the formula AB 2 is … A linear or bent. B linear or trigonal planar. C linear or tetrahedral. D linear or trigonal bipyramidal. (2) The boiling point of CH 4 is much lower than that of HF. Which ONE of the following best explains this difference in boiling points? A HF molecules are more polar than CH 4 molecules. B CH 4 molecules are more polar than HF molecules. C There are hydrogen bonds between HF molecules. D There are dipole-dipole
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essential functions) processes the characters in the word that we read‚ it is now that we can examine and understand more completely what a free radical is and how these molecules affect the effects of the aging process. Free radicals are unstable oxygen molecules produced naturally in our body. When cells metabolize energy‚ these molecules are released. They interfere with normal cell function as their reaction to other cellular chemicals destroys fats‚ proteins and damaging DNA. Free radicals adversely
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the molecule that are larger than the pores will not retarded by the beads and move only in the space between the beads. Thus‚ the larger molecule will not enter the stationary phase‚ staying in the mobile phase surrounding the beads. However‚ the molecule that smaller than the pores of the beads can diffuse further into the beads and move more slowly through the column. The small molecules can completely penetrate the pores in the beads are said to be included by the gel. The large molecules which
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