The chemical components of HCFC refrigerants are:
A) Helium, carbon, frankincense, and Clorox. B) Hydrogen, chlorine, Freon, and chromium.
C) Hydrogen, chlorine, fluorine, and carbon. D) Helium, carbon, Freon, and chlorine.
Question 2
Why do some commercial buildings need air conditioning in the winter?
A) Commercial buildings often have large internal heat loads from people, lights, and machines.
B) The complexity of control systems for commercial buildings often causes a system to cool a building even when cooling is not needed.
C) Commercial buildings are maintained at lower temperatures to improve productivity.
D) Lower temperatures reduce the spread of bacteria.
Guinea pig being injected to test a chemical for its carcinogenic properties
Fate of the Amino acid carbon skeletons
Carbon is constantly exchanged between large reservoirs in the lithosphere
How many hydrogen ions (H+) are present and on what side of the chemical equation?
Chemical structures of the pyrimidines and purines
Partial pressures (in mm Hg) for oxygen (red boxes) and carbon dioxide (blue boxes) in the atmospher