Pollution has many causes and can affect the air and water quality in a variety of ways. Nitrates are a common pollutant found in agricultural runoff. Four groups of students designed experiments to determine the effect of nitrates on algae growth. Which group of students designed an experiment whose variables would lead to the most valid results? Group 1 varied both the temperature and the amount of nitrates.
Group 2 kept both the temperature and the amount of nitrates constant.
Group 3 kept the temperature constant and varied the amount of nitrates.
Group 4 varied the temperature and kept the amount of nitrates constant.

girl imma just put my comment here because i need a couple point okurrttt

consider the reaction below.

 no rx

at 500 k, the reaction is at equilibrium with the following concentrations.

[pci5]= 0.0095 m

[pci3] = 0.020

[ci2] = 0.020 m

what is the equilibrium constant for the given reaction?

0.042

0.42

2.4

24

percent abundance for cu-63 can be shown as:

63 x + 65 (1-x) = 62.9296

65 - 62.9296 = 2 x

x = 1.035

thus, percent abundance for cu-63 is 1.035

percent abundance for cu-65 can be shown as:

63 x + 65 (1-x) = 64.9278

65 - 64.9278 = 2 x

x = 0.0361

thus, percent abundance for cu-63 is 0.0361

the mass spectrum of cu-63 showing the intense peak as, this isotope is found in nature more abundantly around 92.38 % in comparison to cu-65 which is found 62.58 % naturally