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 0°C melts to liquid water at 0°C, 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 21.0°C and the final temperature of the water is 7.0°C, 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

{[ snackBarMessage ]}

Ask a homework question - tutors are online