HKDSE Chemistry – A Modern View 1 (SAMPLE) Suggested Answers (Coursebook) |Chapter 1 The fundamentals of chemistry | |Class Practice |1 | |Chapter Exercises |3 | |Chapter 2 The atmosphere
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.4.1............ Topic: Thermochemistry Aim To determine the heat of combustion for alcohols Problem statement Does alcohol with a higher number of carbon atoms per molecule have a higher heat of combustion? [ K1PP1(i) - Able to write the aim or problem statement correctly] Hypothesis The higher the number of carbon atoms in the alcohol molecules‚ the higher is the heat of combustion. Variables Manipulated variable
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Chemistry 1: PROBLEM SET SY 2012/2013 CLASS #: _______________ NAME_________________________________________ SECTION: ______________________ Stoichiometry II - Mole Calculations/ Limiting and Excess Reagent – Lecture Notes 1. Given the balanced equation N2(g) + 3H2(g) 2NH3(g) How many moles of ammonia are produced when 0.60 mol of nitrogen reacts with hydrogen? 2. Given the equation: SiO2 + HF SiF4 + H2O a. Calculate the number of moles HF that would completely react with 2.5 moles of
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energy for a small explosion. The chemical equation that describes the combustion of ethanol is shown below. (Note: Hover over the equations in this Introduction with your cursor to view enlarged formulas.) Equation 1: C2H6O+3O2→3H2O+2CO2+heat Ethanol: C2H6O Oxygen: 3O2 Water: H2O Carbon dioxide: CO2 The chemical equation states that ethanol (C2H6O)
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Another friend of Libra Dexter Patrick S. Baltazar Pre-test: Chemical balancing Instruction: Balance each chemical equation by adding a correct coefficient to it. Question 1 __ SnO2 + __ H2 → __ Sn + __ H2O Question 2 __ KOH + __ H3PO4 → __ K3PO4 + __ H2O Question 3 __ KNO3 + __ H2CO3 → __ K2CO3 + __ HNO3 Question 4 __ Na3PO4 + __ HCl → __ NaCl + __ H3PO4 Question 5 __ TiCl4 + __ H2O → __ TiO2 + __ HCl Question 6 __ C2H6O + __ O2 → __ CO2 + __ H2O Question 7 __ Fe + __ HC2H3O2 → __ Fe(C2H3O2)3 +
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quick change or increase in gas pressure‚ and a container‚ or a vessel that holds the pressurized gas to the point where it can violently break out of its container. In this experiment‚ the gas being pressurized is ethanol. The equation C2H6O+3O2→3H20+2CO2+heat states that ethanol combines with the other parts of the equation in order to make enough energy to cause a chemical explosion. The scientists then went into deeper research about ethanol and how it will react with the other parts of the equation
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potassium burns in seconds). The alkali metals react quickest followed by the alkaline earth metals‚ found in the leftmost two groups of the periodic table. Examples: 4Na + O2 → 2Na2O (sodium oxide) 2Ca + O2 → 2CaO (calcium oxide) 4Al + 3O2 → 2Al2O3 (aluminium oxide) The transition metals take much longer to oxidize (such as iron‚ copper‚ zinc‚ nickel). Others‚ like palladium‚ platinum and gold‚ do not react with the atmosphere at all. Some metals form a barrier layer of oxide on their
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Hand warmers are small pouches that heat up when they come in contact with air‚ typically used to keep hands warm in cold temperatures. The contents inside the hand warmers‚ mainly the iron powder and activated charcoal‚ and oxygen in the atmosphere‚ react with each other chemically to create warmth. Inside the pouch‚ there is iron powder. When it comes in contact with oxygen‚ the iron rusts and releases heat. The outside bag is a microporous pouch‚ which has tiny holes that are big enough to allow
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most important thing that you learned. | _______________________________________ Special Physical Properties of Matter - KEY V. Questions: What are some things to look for to decide if a change is chemical? Color change‚ produce heat‚ absorbs heat‚ evolves fumes‚ etc. Aluminum produces a white coating in the presence of air that contains salt-water. Is a physical or chemical change
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three stages. Stage 1: The production of sulphur dioxide This can be obtained by two methods: 1. Burning of sulphur in dry air in the furnace S + O SO2 2. Burning of metal sulphide such as zinc sulphide or iron(III) sulphide in dry air. 2ZnS + 3O2 2SO2 + 2ZnO Stage 2: Formation of sulphur trioxide In the converter‚ sulphur dioxide and excess oxygen gas are passed over a few plates of vanadium (V) oxide‚ V2O‚ the catalyst at 450°C to produce sulphur trioxide‚ SO3. 2SO2 + O2 2SO3 Stage
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