Question

& cruciblu tungs evap "Brill. I gradu Part I. Combination 1. Obtain a 1-inch piece of magnesium ribbon. Hold the piece of Mg ribbon with your crucible e tongs and ignite it with your Bunsen burner. Caution! Do not look directly at the burning rib- bon. TABLE 9.6 Observations combustion of magnesium ribbon Sparks were present. Bright light came out just when it was burned enough Color Enange towhite 7 and the piece That was bumed was broken to pieces. a. Is the reaction exothermic or endothermic? Evo-thermic " Reactants Products Mg(s) + Balanced Chemical Equation Part II. Combustion 2. Pour approximately 1 mL of heptane, CH. into an evaporating dish. (Measure the heptane in a graduated cylinder). Carefully ignite the heptane by holding a burning splint over the heptane until it combusts. Use a test tube holder to invert a test tube over the flame produced by the hep- tane. Observe the test tube. Disregard the black soot. While the test tube is inverted light a splint from the heptane flame. Quickly move the inverted test tube away from the flame and insert the burning splint into the inverted test tube. What happened to the burning splint? Carefully note your observations TABLE 9.7 Observations combustion of heptane wosante o foxygioxide esence of oxygen. the wooden splint that was the flanke coming out the lighting in Splint will be distinguished. 1. Alter the smoke has cleared, what do you see collect midway up the inverted test tube? Vapor Condensation, b. Describe what happened when you held the test tube over the burning heptane and tested the con- tents. What gas do you think was collected? Why? Reactants Products Balanced Chemical Equation

Answer 1

PART - I Reactant product Mg(s) + Rcal T Mgo (s) magnesium oxygen I magnesium oxide Balanced chemical equation 2 Macinto con algo (s) Magnesium oxygen magnesium oxide PART - I and (combustion) (6) Heptane produced React with carbon dioxide oa gas Reactant ટિસ 0 વખ : - Heptane C7H16 w + 219 CO₂(g) + H₂O can oxygen | carbon de water * Balanced chemical equation Chistes +1102_09) +7C02(3)+8 H2O) Heptane oxygen carbon water dioxide Vapour