Chin Yung Wei‚ 11071628 (Chemistry Report) The field trip to Petrosains‚ started at 11:30 am with a Dark Ride. The theme for the week is Faces of Energy. The ride‚ shaped as an oil drop‚ bring us to a dark and tranquil ambience through the rainforest of Malaysia‚ up to the peak of a mountain‚ before diving into the sea‚ and finally going through a video display depicting Malaysia’s transformation and its advancement into the new millennium. After that‚ we stop at a place called Petrojaya. It
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substances which do not interact with water are called hydrophobic Water as an universal solvent Ions and polar molecules are charged. They are attracted to water molecules because of the weak positive and negative poles and are therefore dispersed easily in water forming solution Water is an universal solvent (due to its high polarity) for numerous of biochemical molecules‚ giving solution and enabling • Transport of nutrients • Secretion of substances Water in metabolic reactions
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Name two properties of this polymer. e) Name two uses for this type of polymer. 4. a) What is addition polymerisation? b) Polyethylene is an example of an addition polymer. Describe what happens to the ethene molecule during this process. c) The mechanism of addition polymerisation consists of three steps. Name each step and give a brief description of each. 5. a) What is condensation polymerisation? b) Where is condensation polymerisation
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5 Uncertainty in Measurement Precision and Accuracy Significant Figures Significant Figures in Calculations 1.6 Dimensional Analysis Using Two or More Conversion Factors Conversions Involving Volume Chapter 2: Molecules and Ions 2.1 The Atomic Theory of Matter 2.2 The Discovery of Atomic Structure Cathode Rays and Electrons Radioactivity The Nuclear Atom 2.3 The Modern View of Atomic Structure Atomic Numbers‚ Mass Numbers
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Form A Chemistry 100 Introduction to General Chemistry Fall Semester‚ 2010 Exam One‚ 150 points On this page print your name‚ your lab section number‚ and the name of your TA. Also sign this test booklet. Name________________________________Lab section____________TA___________ Signature________________________________________________________________ The exam consists of 21 problems and one extra credit problem. Partial credit is given only for work that is legible and logically and clearly
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IONIC COMPOUNDS In chemistry‚ an ionic compound is a chemical compound in which ions are held together in a lattice structure by ionic bonds. Usually‚ the positively charged portion consists of metal cations and the negatively charged portion is an anion or polyatomic ion. Ions in ionic compounds are held together by the electrostatic forcesbetween oppositely charged bodies. Ionic compounds have high melting and boiling points‚ and they are hard and very brittle. Ions can be single atoms‚ as the sodium and chlorine in
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sheet: Row 2: Determine the molar mass of each compound (check the periodic table…) Row 3: Determine the amount of mol you scooped for each sample grams (row 1) x 1 mol = mol of compound Molar mass (row 2) Row 4: Determine the number of particles (molecules or formula units) for each compound # of moles (row 3) x 6.02 x 1023 particles = # of particles 1 mol Row 5: Determine the number of atoms in each formula (add all subscripts in the formula). Row 6 Determine the number of atoms in each sample you
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= OH ̅ B. nitrate ion = NO3 ̅ C. sulfide ion = SO32 ̅ D. nitrite ion = NO2 ̅ E. sulfate ion = SO42 ̅ 5 How many molecules are in 0.25 mole of Na2O? A. 4.5 × 10(23) B. 0.75 C. 1.5 × 10(23) D. 4.2 × 10( ̅ 25) E. 0.25 6 Calculate the molar mass of Na2SO4. A. 94.05 g/mol B. 71.06 g/mol C. 142.05 amu D. 142.05 g/mol E. 94.05 amu 7 If 4.05 × 1023 molecules of a substance have a mass of 86.2 g‚ what is the molar mass of the substance? A. 128 g/mol B. 3.49 × 1025 g/mol C. 2
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bonding pairs‚ resulting in compression of adjacent bond angles. 9.12 a) Both molecules would be symmetrical because all four surrounding atoms are the same. In a symmetrical tetrahedron‚ the four bond angles are equal to each other‚ with values of 109.5°. The H-C-H angles in CH4 and the O-Cl-O angles in ClO4- will have values close to 109.5°. b) Two 1) The H-N-H angle 2) The N-H distance In a trigonal pyramidal molecule‚ there are three bonding and one nonbonding electron domains. Since a nonbonding
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25.0 mL) = 6. An irregularly-shaped metal object has a mass of 10.867 g. When the object was immersed in 50 mL of water in a graduated cylinder‚ the water level rose from 50.0 mL to 58.5 mL. What is the density of the object? Chapter 2 – Atom‚ Molecules‚ and Ions 7. How many protons‚ neutrons‚ and electrons are in the following atoms or ions? a) iron–56 b) the element with symbol W and 109 neutrons c) the +3 ion with the symbol Ga and 39 neutrons 8. Name the following compounds: a) CuCl2 b)
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