Lab: Enthalpy — Cumulative exam Answers
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A can of soda contains many ingredients, including vanilla, caffeine, sugar, and water. Which ingredient is the solvent?
A
caffeineB
sugarC
vanillaD
water22
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Carbon reacts with oxygen to produce carbon dioxide (CO2 (g), Hf = –393.5 kJ/mol) according to the equation below.What is the enthalpy change of the reaction? Use .
A
–393.5 kJB
–196.8 kJC
196.8 kJD
393.5 kJ23
Which definition describes activation energy?
A
the speed at which reactants form products in a chemical reactionB
the short-lived, high-energy intermediate between reactants and productsC
the diagram showing a change in energy between reactants and productsD
the minimum energy that a set of reactants must attain before reaction can occur24
What is the percent by mass of water in Na2SO4 • 10H2O?Use .
A
5.59%B
11.26%C
44.08%D
55.92%25
The graph below shows how solubility changes with temperature.How many grams of NaCl will be needed to form 600 mL of a saturated solution at 100°C?
A
15 gB
24 gC
40 gD
240 gDid you find these answers helpful?
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