OCG 123 Survey Answers
Spring Semester 2002
This quiz will be graded. You will receive10 points answering the following questions (whether incorrect or correct) to the best of your ability.
Science Survey:
1. What percent of the earth’s surface is covered by water? ~70%
2. Name 2 global scale anthropogenic (human-caused) environmental problems?
Global warming
Ozone Hole
Deforestation and land development
Nutrient enrichment/eutrophication of coastal waters
3. What is approximate age of the planet earth? Of the first evidence of life?
The Earth was formed about 4.6 billion years ago.
The first evidence of life was about 3.8 billion years ago.
4. What are the 6 major chemical elements essential to life?
CHNOPS : Carbon, Hydrogen, Nitrogen, Oxygen, Phosphorous, and Sulfur
5. Describe photosynthesis. What is the chemical reaction that occurs during this process?
Photosynthesis is the process in which a plant converts the energy from sunlight into organic matter. The essential chemical reaction is:
CO2 + H2O -> (CH2O)6 + O2
Carbon dioxide and water -> organic matter and oxygen
Math Survey (show calculations):
1. How many seconds are there in a day?
1 day * (24 hours/ 1 day) * (60 min./ 1 hour) * (60 sec./1 min) = 86,400 seconds
2. If 2x + 7y = 91, write an expression for y (i.e. y = …). If this line was displayed on a graph what would be the slope of the line? If y = 11, what is x?
7y = 91 – 2x if y = 11 then 11 = 13 – 4 x
y = (91- 2x)/7 -2 = -4x
y = 13 – 4x x = 0.5
3. What are the square roots of the numbers
a) 81 __9__ b) 0.49 __0.07__ and 10000 _100____?
4. Write the following numbers in powers of 10:
a) 10,000 __104___ b) 5,000,000 __5* 106_____ c) 0.04 ___4 * 10-2___
5. In the attached graph, what is the value of q (on the right axis) if S = 35, T = 15?
About 27