and empty 50 mL beaker. Rinse out the crucible with two 8 mL aliquots of distilled water and pour the water into the 50 mL beaker. Gently swirl the beaker to completely dissolve the solid. Note that the color of the solution is green as the copper ions are rehydrated. 9. Measure out about 20 cm of aluminum wire‚ coil the wire‚ and place the wire in the beaker of solution so that it is completely immersed in the copper chloride solution. Note that the reaction produces a gas‚ elemental copper is forming
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Dagondon‚ Vanessa Olga Date of experiment: July 1‚ 2013 Nablo‚ Janica Mae Date of submission: July 18‚ 2013 Palmitos‚ Isabel Experiment # 2 chemical changes I. INTRODUCTION Chemical changes occur when a substance combines with another to form a new substance whether by combination reaction‚ combustion reaction‚ decomposition reaction and etc. These changes can be observed by evolutions of gas‚ appearance or disappearance of a precipitate‚ evolution or absorption of heat or even change
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to 700nm 3.Explain why “roses are red and Violets are blue Answer human eye can view only the color that is reflected‚ the remaining color in visible spectrum are being absorbed by the plant pigments for energy use. Molecule or Molecular ion | Valence shell Electron pairs | Bonding Electron pairs | Nonbonding Electron pairs | VSEPR Formula | Approx. Bond Angle | Geometric Shape | BrCl3 | 5 | 3 | 2 | AX3E2 | <90o | T-shaped | IF4- | 6 | 4 | 2 | AX4E2 | 90o | Square planar
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amount of distilled water 2. Crystals were added to those already in the funnel and washed 8-10 times with hot water‚ allowing excess water to drain 3. Silver nitrate was used to test for presence of chloride and washed repeatedly until no ion was present in wash water E. 1. Sample was set aside for one week F. 1. A crucible with cover was obtained‚ and were both cleaned and dried 2. Crucible was marked with blue wax pen to differentiate it from the rest 3. Crucible was
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it contains and the forces of attraction that exist between the atoms. Some of these properties are hardness‚ solubility‚ electrical conductivity‚ and melting point. Ionic solids are those that have forces of attraction between oppositely charged ions. Ionic bonds allow the substance to remain in a crystal lattice. Since they are in crystalline form‚ they are hard and have high melting points. They are also excellent conductors of electricity. Covalent solids exist as a soft solid (or liquid
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In this assignment‚ you will build models of molecules in order to answer questions about their shape and chemical properties. Materials: * multicolored gumdrops‚ marshmallows‚ or other soft candy (to represent atoms in each model) * toothpicks (to represent the covalent bonds in each model) * paper (to draw Lewis dot structures and pictures of the models) Introduction: Chemists often use three-dimensional models to help represent the geometry‚ or shape‚ of molecules. You can purchase
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Assessment 1) Describe the difference between ionic and covalent bond. Ionic bonds have electrostatic forces that hold cations and anions together‚ and are electronic neutral. Covalent bonds are bonds that don’t give or take any electrons. In stead they share the elctrons 50) Which of these compounds contain elements that do not follow the octet rule? Explain. a) NF3: 5 + (7*3) = 26 b) PCl2F3: 5 + (7*2) + (7*3) = 40 c) SF4: 6 + (7 *4) = 24 d) SCl2: 6 + (7*2) = 20 The answer is “d”
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Name : Dania Annuar Class : M11G Title : Determination of Chloride in Urine in Different Circumstances Aim: To determine the chloride content by titrating mixtures of urine against potassium thiocyanate under in different circumstances. Research Question: How do different conditions of urine samples collected affect its concentration of chloride which is measured by titrating the mixture of urine with potassium thiocyanate until it turns red? Hypothesis: The greater the consumption
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but don’t have them memorized • Read the oxidation states (charges) on the periodic table However‚ you should assume that they have no knowledge on ionic and covalent bonds‚ criss‐cross rule‚ prefixes‚ acids‚ and adding or subtracting oxygen atoms from polyatomic ions. Instructions: • Use only yes/no type of question (there must be two answers‐ yes or no). • • • • • Questions must relate to the compound name Start by asking a single general question that divides the compounds into two categories Contin
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k Zn(C2H3O2)2 l Total atoms Na2SO4 c / 24 H2O b 2 marks for each correct row 6 C6H12O6 2 Describe what the following chemical symbols and formulae represent. Symbol or formulae a OH1- b Polyatomic ion (hydroxide). One atom of oxygen bonded to one atom of hydrogen‚ with an overall charge of –1. 2 marks for each correct answer 3 CaCl2 d / 6 CO2 c Description Al(NO3)3 TOTAL / 30 16 Quick Science Tests – Chemistry
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