Chemical Equations Name _____________________________ Balancing Balancing Equations Challenge Part A: Parts & Pieces (1) Circle each subscript in each chemical formula. (2) Draw a square around each coefficient. (3) Answer the questions related to each chemical formula. O2 CO2 5 H2 What element does the O represent? ___________________ How many atoms of each element are in the formula shown? C = ______ O = ______ How many atoms of Hydrogen are in this formula as shown
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several phases; these have been written as balanced chemical equations: 1: 2 Zn(NO3)2 + 2 H2SO4 ? 2 ZnSO4 + 4 HNO3 4 FeSO4 + 2 H2SO4 ? 2 Fe2(SO4)3 + H2 These two reactions happen simultaneously. 2: 4 HNO3 ? 2 H2O + 3O2 + 2 NO The Nitric Acid decomposes in the intense heat produced by the high concentrate Sulphuric Acid used. 3: 2 Fe2(SO4)3 + 2 H2 + 4 NO ? 4 Fe.NO.SO4 + 2 H2SO4 The Fe.NO.SO4 forms a brown ring in the middle of the solution produced by the reaction‚ making it easy to
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a Write a balanced equation for the reaction. C2H5OH(l) 3O2(g) → 2CO2(g) 3H2O(l) b If 98 L of CO2 is formed at 25°C and 100 kPa‚ calculate the mass of ethanol used in the reaction. moles CO2 98/24.79 3.95 mol moles ethanol 3.95/2 1.98 mol mass ethanol 1.98 46 91 g c Use the data from part b
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HKDSE CHEMISTRY – A Modern View (Chemistry) Coursebook 3 Suggested answers |Chapter 25 Simple molecular substances with non-octet |Page Number | |structures and shapes of simple molecules | | |Class Practice |1 | |Chapter Exercise
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conclude that solution 7 is CaCl2. Chemical reactions with observable changes: 2HCl (aq) + Na2CO3 (aq) → H2O + CO2 (g) + 2 NaCl (aq) Gas bubles HCl + K2CrO4 → 2KCl (aq) + H2CrO4 (aq) Orange color NaOH(aq) + CaCl2 (aq) → NaCl2(aq) + Ca(OH)2 White color NaOH(aq) + CuSO4 (aq) → Na2SO4 (aq) + Cu(OH)2 (s) Blue precipitate Na2CO3 (aq) + CaCl2 (aq)
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H 204 – Introduction to Chemical Practice Experiment # 1– Qualitative Analysis of Cations Rachel Sorrells Gretchen Diede TA: Kunal Punjabi February 16‚ 2017 RESULTS & DISCUSSION The purpose of this experiment was to utilize two different methods of qualitative analysis to determine the identity of two unknown cations in an unknown solution. The experiment required knowledge of solubility rules and demonstration of such in the laboratory setting for the first method of qualitative analysis. The
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Priyahlatha Nainar | 3P1 – Illio Suardi / Song Mingwei | 1P1 | Huo Yasi | 3P2 – Aaron Lin / Ethan Looi | 1P2 | Esteban Juan Karplus | 3P3 – Chia Chu You / Thomas Toh | 1P3 | Liew Pei Li | 3O1 – Elmer Yap / Royce Chan | 1O1 | Eugene Chua | 3O2 – Averyl Seah / Justin Ho | 102 | Tan Yew Hui | 3O3 – Lawrence Liang / Gabriel Loye | 1O3 | Christopher Leow | 3H1 – James Ee / Chua Wei Rong | 1O4 | | Standby – Chong Han / Lucas Teo (3B1)‚ School Debaters | | | | | Peter Gilbert |
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Chemistry Equipment Symbols 1. Test Tube 2. Boiling Tube 3. Beaker 4. Conical Flask 5. Test Tube Holder/ Tongs /Clamp Stand 6. Measuring/Graduating 7. Funnel 8. Pipette Cylinder 9. Spatula 10. Tripod 11. Bunsen Burner 12. Glass Bulb 13. Burette 16. Condenser Pipette Changes of State Filtering Solutions 03-Nov
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Therefore‚ we must balance the equation by placing coefficients before the various molecules and atoms to ensure that the number of atoms on the left side of the arrow corresponds exactly to the number of elements on the right. 4Fe +3O2→2Fe2O3 Let’s count up the atoms in this new‚ balanced version of the reaction. On the left of the arrow we have 4 atoms of iron and 6 atoms of oxygen (since 3×2 = 6 ). On the right we also have 4 iron (since 2×2 = 4 ) and 6 oxygen ( 2×3
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Chemistry: Research task 1 5.1- define the terms mineral and ore with reference to economic and non-economic deposits of natural resources The term ‘ore minerals’ is commonly referred to as economic minerals Mineral: naturally occurring compounds. Rocks are mixtures of various minerals. Most minerals are lattice structures‚ both ionic and covalent. Economic minerals have been divided into two main categories: Metalliferous minerals- mined to extract a metal Industrial mineral- either has
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