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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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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able to: Mole Concept • Calculate formula mass. • Convert representative particles to moles and moles to representative particles. (Representative particles are atoms‚ molecules‚ formula units‚ and ions.) • Convert mass of atoms‚ molecules‚ and compounds to moles and moles of atoms‚ molecules‚ and compounds to mass. • Convert representative particles to mass and mass to representative particles. • Convert moles to volume and volume to moles at STP. • Calculate
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1 mole of any substance can be defined as: Amount of a substance that contains as many particles (atoms‚ molecules or ions) as there are atoms in 12 g of the 12C isotope Avogadro number or Avogadro constant (NA); equal to 6.022 × 1023 particles Example − 1 mole of oxygen atoms = 6.022 × 1023 atoms 1 mole of carbon dioxide molecules = 6.022 × 1023 molecules 1 mole of sodium chloride = 6.022 × 1023 formula units of sodium chloride Molar mass of a substance can be defined as: Mass of one mole
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(Jan 2012) (a) Identify polar group(s) in molecule A & write down the chemical formula(s) (b) Redraw the molecule A; the answer the following questions: (i) Label chiral centre(s) using (*) (ii) Label & identify type(s) of hybridization of all carbons in molecule A (iii) Identify 2 bonds in the molecule containing π bonds. 4. Consider the compound below:
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to have sufficient volatility. The theory behind the mass spectrometer is to use the difference in mass-to-charge ratio (m/e) of ionized atoms or molecules to separate them from each other. Mass spectrometry is therefore useful for quantitation of atoms or molecules and also for determining chemical and structural information about molecules. Molecules have distinctive fragmentation patterns that provide structural information to identify structural components. The combination of the gas chromatograph
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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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