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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Page 1 of 10 5.111 Principles of Chemical Science EXAM # 3 ============================================================================ Write legibly your name and your TA’s name below. Do not open the exam until the start of the exam is announced. The exam is closed notes and closed book. You have 50 minutes (1 academic hour) to complete it. ● Read each part of each problem carefully. ● Write your answers legibly in the corresponding spaces of the attached sheets. ● For problems requiring
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Lab #6 Properties of Hydrates Purpose: The purpose of the “Properties of Hydrates” lab is to study hydrates‚ and be able to identify them. This lab also focuses on observing the reversibility of hydration reactions by hydrolysis‚ and also testing substances for efflorescence of deliquescence. Procedure: A. Identification 1. Place 0.5 grams of each compound (Nickel Chloride‚ Potassium Chloride‚ Sodium Tetraborate‚ Sucrose‚ Calcium Carbonate‚ and Barium Chloride) in a small dry test
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Rules for Naming and Writing Compounds I. Ionic Bonds • bonding between a metal and non-metal or the bond between a positive ion and a negative ion forming a binary compound. • end in the suffix "ide" • Or bonding between a metal and a complex ion. Steps in writing formulas: • • • • Use a periodic table of elements and of ions. Write the symbol and charge of the cation first (positive ion) Write the symbol and charge of the anion next (negative ion) Use criss-cross rule to balance for an electrically
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chloride. All observations were recorded. Next add 10 drops of sulfate solution to a new centrifuge tube and several drops of 6 M HNO3 solution was added until the solution turned acidic. Acidity was tested by using a stirring rod and litmus paper. BaCl2 was added until a precipitate formed. All observations were recorded. Then‚ 10 drops of nitrate solution and 10 drops of 6 M NaOH were mixed together in a centrifuge tube‚ then the mixture was transferred to a dry centrifuge tube with a pipet. A few
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supernatant III and pour half of the solution into a second clean test tube. To one test tube add drops of 1M Na2CO3 solution and watch for formation of a white CaCO3 precipitate. (Ca2+ would also be confirmed by; to the second test tube add drops of 1M K2CrO4 solution and watch for formation of a canary yellow CaCrO4 precipitate.) The other test tube of solution can be used for a flame test – reddish flash confirms Ca2+. Use the Outline below when collecting your data and writing your lab
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Aseel Muqbel 15/2/2015 11th D Flame Test Intro: The flame test is a procedure used by chemists to identify the presence of specified metal ions‚ based on the color the flame that appears along with it when it ’s heated. Our flame test was in lab class‚ where the main aim was to tested different solid metals in the flame in order to observe the wide variety of colors those chemicals also sometimes compounds (by mixing them) they produced‚ the second one was to identify unknown metals based
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Cl- (aq) NH4Cl(s) + H2O(l) + ENERGY → NH4OH(aq) + H+(aq) + Cl- (aq) NaCH3COO(s) + H2O(l) ENERGY (Small amount) → Na+(aq) + CH3COO-(aq) H2O(l) NaCH3COO(s) → Na+(aq) + CH3COO-(aq) No reaction for NaCl and water so no equation 2NaCl(s) + Ba(OH)2(s) → BaCl2(aq) + 2NaOH(aq) 2Fe(s) + CuSO4(aq) → Cu2+(s) + Fe2SO4(aq) Conclusion (Research all references in
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Mike Morrison – SCH3U Types of Chemical Reactions Lab Intro/Purpose The purpose of this lab is to determine types of reactions with only the reactants and through observation. Through observing the experiments‚ one is able to see a visual of each type of reaction taking place and it gives them a better understanding of how chemical reactions work and what products they may form. Materials & Procedure Materials: * Wood Splints - Copper Sulfate * Sodium Sulfate - Copper
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A series of 250ml Erlenmeyer flasks containing 100ml of M1 medium (0.2g NaNO3‚ 0.05g KCl‚ 0.05g MgSO4.7H2O‚ 1g glucose‚ 0.001g FeCl3‚ 0.02 g BaCl2‚ 0.05g CaCl2) at pH 6.8 with an addition of increasing concentration of deltamethrin was prepared. 1ml of 108 fungal spore suspension cultures was added into each of these flasks. These flasks were incubated at 280± 20C on the shaker at 120rpm for
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