Given the following conjugate acid-base pairs and their Ka values at 25°C, which of the following acid-base buffer systems might be found in the human body?
Choose one or more:
H2PO41- / HPO42- ; Ka = 6.4x10-8
HF /F - ; Ka = 6.8×10-4
H2CO3/HCO3- ; Ka = 4.3x10-7
HCl O2/Cl O2- ; Ka = 1.10×10-2
HIO /IO - ; Ka = 2.30×10-11
CH2I COOH/CH2I COO- ; Ka = 7.60×10-4
HCO3-/CO32- ; Ka = 4.7x10-11
C6H5COO H/C6H5COO - ; Ka = 6.20×10-5
H3PO4/H2PO42- ; Ka = 6.9x10-3

Write the symbol for every chemical element that has atomic number greater than 3 and atomic mass less than 12.0 u.

What amount of heat is exchanged when 106.2 grams of substance y goes from a liquid at 35 degrees celsius to a solid at the same temperature? melting point of substance y = 35 degrees c; δhvaporization = 3.67 j/mol; δhfusion = 3.30 j/mol. mwsubstance y = 28.22 g/mol. −12.4 j −3.51 x 102 j 1.24 x 101 j 351 j

(04.05 hc) analyze the given diagram of the carbon cycle below. an image of carbon cycle is shown. the sun, a cloud, two trees, one on the left and the other on the right, an animal, lake, and a factory are shown in the image. an arrow is shown from the sun towards the left tree marked a. the sun is marked b. there is an arrow from the air above the clouds, marked c, towards the left tree. an arrow from a location close to the ground marked d points towards dead organisms, which is a label under the animal. an arrow marked e points from the right tree straight up to the clouds. an arrow marked f points from the animal straight up to the clouds. an arrow marked g points from the factory towards the air above the clouds, c. there is an arrow pointing from the air to the lake labeled carbonates in water, an arrow pointing down from dead organisms to fossils and fossil fuels, and an arrow from fossils to the factory. part 1: which compound does c represent? part 2: name a process that could release this compound into the air. part 3: explain how the elements that form it are conserved during the carbon cycle. use complete sentences to explain your answer.