In a car airbag, sodium azide (NaN3) decomposes to form sodium metal and nitrogen gas (reaction1). The sodium metal then reacts with potassium nitrate to produce more nitrogen gas (reaction 2) according to the following equation: Na(s) + KNO3(s) → N2(g) + Na2O(s) + K20(s) a) Write the balanced chemical equation for the reaction (1) that happened in the airbag. b) Balance the equation of reaction 2 c) In a table classify all molecules and compounds in reaction 1 and reaction 2 into ionic or covalent.

The extraction of aluminum metal from the aluminum hydroxide found in bauxite by the Hall-Héroult process is one of the most remarkable success stories of 19th century chemistry, turning aluminum from a rare and precious metal into the cheap commodity it is today. In the first step, aluminum hydroxide reacts to form alumina (Al2O3) and water: ->> 2Al(OH)3(s) Al2O3(s) + 3 H₂O(g) In the second step, alumina (Al2O3) and carbon react to form aluminum and carbon dioxide: 2A1,0,(x) + 3C(s) 4Al(s) + 3 CO, (g) -> Suppose the yield of the first step is 78.% and the yield of the second step is 97.%. Calculate the mass of aluminum hydroxide required to make 5.0 kg of aluminum. Be sure your answer has a unit symbol, if needed, and is rounded to the correct number of significant digits. ☐ olo □□ § 4 ? olo &

7. Carbonate rocks, such as limestone (primarily CaCO3(s)), are often identified by adding a few drops of acid and seeing if the rock fizzes. If the rock does show bubbling, the following reaction has occurred: CaCO3(s) + 2HCl(l)  CO2(g) + H2O(l) + CaCl2(aq)This reaction is performed in the laboratory, and 78 mL of CO2(g) are collected at 298 K and 1 atm. How many moles of HCl participated in this reaction?

Blast furnaces extract pure iron from the iron(III) oxide in iron ore in a two step sequence. In the first step, carbon and oxygen react to form carbon monoxide: 2 C(s) + O₂(g) →2 CO(g) In the second step, iron(III) oxide and carbon monoxide react to form iron and carbon dioxide: Fe₂O3(s) + 3 CO(g) →2 Fe(s)+3 CO₂(g) Write the net chemical equation for the production of iron from carbon, oxygen and iron(III) oxide. Be sure your equation is balanced.