Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
Related questions
Question
2 b

Transcribed Image Text:For each question, appor
reasonable work according to your discretiol
are heeded to release 49 000 | of heat? (3 marks- 2 marks for work, 1 mark for
answer)
) If burning 100g.of sugar (glucose) releases 1560 kl of heat, how many
mail
4x41945
- 16736J
Toog G Releases = 1560 kj
147BLJ heat Releie Ig sugar
49006 -2.92g
T6730
2) A light-year is a non-SI unit with a length of the distance that light travels in one year
a vacuum. The speed of light is 300 000 000 meters per second. (5 marks total)
a) What is the distance of a light-year in metres? (3 marks)
以
Booddobo0
distance < spees xtrme
THac)se
3x10*m/s x 3.2X107s =9.6x lo'm
A b) What is the distance of a light-year in kilometres? (2 marks 1 mark for work, 1
mark for correct answer)
According to our best astronomy, the observable universe is about 91 billion light years
in diameter. What is the diameter of the observable universe in gigametres? (3 marks-
2 marks for work, 1 mark for correct answer)
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