1)When Jack performed a flame test on his unknown solid, he observed a violet-colored flame. Given this result and the answer to Question 16, what is the chemical formula of Jack's unknown solid? a)KHCO 3 b)NaHCO 3 c)K 2CO 3 d)Na 2CO 3 2) A Mass of empty evaporating dish + watch glass 65.362 g B Mass of dish + watch glass + initial solid 65.864 g C Mass of dish + watch glass + carbonate 65.705 g D Mass of dish + watch glass + chloride 65.716 g Calculate the mass (in grams) of the final chloride product that Jack obtained after reacting his carbonate with HCl. This mass represents the actual yield of Jack's overall reaction. Include the appropriate number of significant figures. 3)Use your answer to Question 1 and the appropriate balanced chemical equation (see page 2 in the procedure handout) to calculate the theoretical yield (in grams) of MCl in Jack's reaction (M = Na or K, depending on the chemical formula of the unknown). Include the appropriate number of significant figures.
Thermochemistry
Thermochemistry can be considered as a branch of thermodynamics that deals with the connections between warmth, work, and various types of energy, formed because of different synthetic and actual cycles. Thermochemistry describes the energy changes that occur as a result of reactions or chemical changes in a substance.
Exergonic Reaction
The term exergonic is derived from the Greek word in which ‘ergon’ means work and exergonic means ‘work outside’. Exergonic reactions releases work energy. Exergonic reactions are different from exothermic reactions, the one that releases only heat energy during the course of the reaction. So, exothermic reaction is one type of exergonic reaction. Exergonic reaction releases work energy in different forms like heat, light or sound. For example, a glow stick releases light making that an exergonic reaction and not an exothermic reaction since no heat is released. Even endothermic reactions at very high temperature are exergonic.
1)When Jack performed a flame test on his unknown solid, he observed a violet-colored flame. Given this result and the answer to Question 16, what is the chemical formula of Jack's unknown solid?
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a)KHCO 3 |
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b)NaHCO 3 |
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c)K 2CO 3 |
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d)Na 2CO 3 |
2)
| A | Mass of empty evaporating dish + watch glass | 65.362 g |
| B | Mass of dish + watch glass + initial solid | 65.864 g |
| C | Mass of dish + watch glass + carbonate | 65.705 g |
| D | Mass of dish + watch glass + chloride | 65.716 g |
Calculate the mass (in grams) of the final chloride product that Jack obtained after reacting his carbonate with HCl. This mass represents the actual yield of Jack's overall reaction.
Include the appropriate number of significant figures.
3)Use your answer to Question 1 and the appropriate balanced chemical equation (see page 2 in the procedure handout) to calculate the theoretical yield (in grams) of MCl in Jack's reaction (M = Na or K, depending on the chemical formula of the unknown). Include the appropriate number of significant figures.
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