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 300C, 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]

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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]

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decomposition

74 State evidence that indicates the entropy of the products is greater than the entropy of the reactant. [1]

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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]

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Answer=2120kg

3360 -(360+880)=2120

Find the missing mass

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