June 2010 Chemistry Regents #72-75

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Base your answers to questions 72 through 75 on the information below. The Solvay process is a multistep industrial process used to produce washing soda, Na2CO3(s). In the last step of the Solvay process, NaHCO3(s) is heated to 300°C, producing washing soda, water, and carbon dioxide. This reaction is represented by the balanced equation below. 2NaHCO3(s) + heat ==> Na2CO3(s) + H2O(g) + CO2(g) 72 Write the IUPAC name for washing soda. [1] HIGHLIGHT TO SEE THE ANSWER sodium carbonate WRONG=Sodium(I) Carbonate Roman Numerals are only used it for elements with multiple oxidation numbers 73 Identify the type of chemical reaction represented by the equation. [1] HIGHLIGHT TO SEE THE ANSWER decomposition 74 State evidence that indicates the entropy of the products is greater than the entropy of the reactant. [1] HIGHLIGHT TO SEE THE ANSWER The products of the reaction include two gases, while the reactant is a solid. The gases have greater entropy than the solid. The NaHCO3(s) reacts to produce H2O(g) and CO2(g) that have greater disorder. Easier answer ==> solid forms gases 75 Determine the total mass of washing soda produced if 3360. kilograms of NaHCO3 reacts completely to produce 360. kilograms of H2O and 880. kilograms of CO2. [1] HIGHLIGHT TO SEE THE ANSWER Answer=2120kg 3360 -(360+880)=2120 Find the missing mass Next Questions

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