General Chemistry: Media Enhanced Edition, 8th Edition

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
Names: ______ KEY _________________ CHEM 130: Disc. 215 GSI: Lauren Goodrich ____________________________ QUIZ 6 ____________________________ Show all work and report answers to the correct number of significant figures. 1. The sugar arabinose, C 5 H 10 O 5 is burned completely in oxygen in a calorimeter. Complete and balance the above reaction (include phase labels). (2 points) C 5 H 10 O 5 (s) + 5 O 2 (g) 5CO 2 (g) + 5H 2 O(l) Burning a 0.548g sample caused the temperature to rise from 20.00°C to 20.54°C. The heat capacity of the calorimeter and its contents is 15.8kJ/°C. Calculate ΔH for the combustion reaction per mole of arabinose. . (4 points) -2340 kJ Based on your answer above, is the reaction exothermic or endothermic? (1 point)
Background image of page 1
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: exothermic 2. When ice at 0C melts to liquid water at 0C, it absorbs 0.334kJ of heat per gram. Suppose the heat needed to melt some mass of ice is absorbed from the water contained in the glass. If this water has a mass of 150g and a temperature of 21.0C and the final temperature of the water is 7.0C, what is the initial mass of the ice. (4 points) 24.2g ice 3. Any object must attain an initial upward velocity of at least 11.2 km/s in order to escape the gravitational attraction to the earth. What would be the kinetic energy in joules if a satellite weighing 2354 lb that has the speed equal to this escape velocity of 11.2 km/s. (3 points) 6.70 x 10 10 J...
View Full Document

Ask a homework question - tutors are online