Which of the following would be the most appropriate way to collect a sample of blood? A. Wet blood is allowed to first air dry before a scraping is taken.

B. Dried blood is carefully collected on a cotton swab.

C. Blood is placed in a tightly sealed glass jar in preparation for transport.

D. When found on an object, only the part of the object that contains blood should be collected.

- Sorry about the 'Subject' tab, I know Chemistry isn't the right subject, but they don't have one for Forensics.

There are two steps in the usual industrial preparation of acrylic acid, the immediate precursor of several useful plastics. in the first step, calcium carbide and water react to form acetylene and calcium hydroxide: cac2 (s) + 2h2o (g) → c2h2 (g) + caoh2 (s) =δh−414.kj in the second step, acetylene, carbon dioxide and water react to form acrylic acid: 6c2h2 (g) + 3co2 (g) + 4h2o (g) → 5ch2chco2h (g) =δh132.kj calculate the net change in enthalpy for the formation of one mole of acrylic acid from calcium carbide, water and carbon dioxide from these reactions. round your answer to the nearest kj .