12. (2.5) a. A hydrogen atom has a diameter of 5.3 x 10-¹¹ m. Express this diameter in nanometers and picometers. b. Placed side-by-side, how many hydrogen atoms would it take to equal a distance of 1 inch (1 in = 2.54 cm)? 13. (2.11) The elements carbon, calcium, chlorine, copper, and cobalt are present in the human body. Match each element to its correct atomic symbol: Co, Cu, Ca, C, Cl. 14. (2.17) In NAS dietary tables the dietary reference intakes for selenium is reported in micrograms per day, rather than the milligrams per day. For this element, convert the values into micrograms per day. a. The RDA for selenium is 0.055 mg/day. b. The UL for selenium is 40 mg/day.
12. (2.5) a. A hydrogen atom has a diameter of 5.3 x 10-¹¹ m. Express this diameter in nanometers and picometers. b. Placed side-by-side, how many hydrogen atoms would it take to equal a distance of 1 inch (1 in = 2.54 cm)? 13. (2.11) The elements carbon, calcium, chlorine, copper, and cobalt are present in the human body. Match each element to its correct atomic symbol: Co, Cu, Ca, C, Cl. 14. (2.17) In NAS dietary tables the dietary reference intakes for selenium is reported in micrograms per day, rather than the milligrams per day. For this element, convert the values into micrograms per day. a. The RDA for selenium is 0.055 mg/day. b. The UL for selenium is 40 mg/day.
Chapter2: Life's Chemical Basis
Section: Chapter Questions
Problem 3CT: Polonium is a rare element with 33 radioisotopes. The most common one, P210o, has 84 protons and 126...
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Please explain all questions thoroughly step by step (12,13,&14)
Transcribed Image Text:12. (2.5)
a. A hydrogen atom has a diameter of 5.3 x 10-¹¹ m. Express this diameter in
nanometers and picometers.
b. Placed side-by-side, how many hydrogen atoms would it take to equal a distance
of 1 inch (1 in = 2.54 cm)?
13. (2.11) The elements carbon, calcium, chlorine, copper, and cobalt are present in the
human body. Match each element to its correct atomic symbol: Co, Cu, Ca, C, Cl.
14. (2.17) In NAS dietary tables the dietary reference intakes for selenium is reported in
micrograms per day, rather than the milligrams per day. For this element, convert the
values into micrograms per day.
a. The RDA for selenium is 0.055 mg/day.
b. The UL for selenium is 40 mg/day.
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