pH measurement of lake A is 8.0 and lake B is 6.0 . Therefore, compare to lake B, lake A is _______ times more basic.

A) 10

B) 100

C) 1000

D) 0.1

E) 0.01

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Hubert KochLv2

24 Feb 2019

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In a 2010 re-survey of the lake, another 500 crayfish were randomly surveyed. The survey revealed that the population is now only 9,000 crayfish. Some of the new allele frequencies, which have clearly changed since 1990, are indicated in the table below.

Gene Allele Allele Frequency

CPX CPX 0.41

cpx

SWM SWM 0.67

SWMâ 0.15

swm

MOLT MOLT 0.27
molt

4. Based on this 2010 data, determine the following for both the sample and the total population of the lake.

a. What are the allele frequencies of cpx, swm, and molt?

b. How many crayfish are brown?

c. How many crayfish are cream?

d. What is the genotype frequency of SWM/swm?

e. What is the phenotype frequency of crayfish with sharp-tipped swimmerets?

f. How many of the crayfish in the lake molt repidly?

tanhound578

1. name two human activities that can increase the temperature of a body of water and describe how each activity would cause the change in temperature. what other WQI parameter might be affected by an increase in temperature?

2. Name at least two effects a change in temperature would have on the aquatic organisms found in a body of water?

3. What might be the cause of high levels of fecal coliform in a body of water? Though most strains of E. coli are non-pathogenic, why might a scientist be concerned by multiple "positive" fecal coliform tubes and a high calculated MPN for a sample of water?

4. a) you visit Otter Lake at 7:00am to collect water for your team's Capstone Project. While you are there, you measure the dissolved oxygen (DO) of the lake and find the DO value to be 60% saturation. On the way home, your water containers fall over and all of your water spills out. One of your teammates returns to Otter Lake at 5:00 pm to collect more water and measure the DO again but finds the DO value to be 100% saturation. How would you explain the difference in DO measurements between teammates?

b) after getting home, your teammate reviews Appendix B in the lab manual and realizes they needed to collect 7 liters of water, but only collected 3 liters. You advise your teammate to empty out the water they collected and you return to Otter Lake once again to collect all 7 liters of water. You arrive at Otter Lake at 10:00 pm and measure the dissolved oxygen. At 10:00 pm you find the DO value to be 80% saturation. How would you exolain the difference in DO measurements between teammates?

Part A

Which answer is a true statement about pH values?

Part A

Which answer is a true statement about pH values?

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Part B

What conditions must be met in order for an aqueous solution to be called âneutralâ?

Pure water has a pH of 0.

pH is important in life mainly because it affects the cohesion of water.

A high pH corresponds to a high H⁺ concentration.

Stomach juice has a high pH.

None of the above.