Find a general solution of each reducible

Introductory Chemistry 5
Balance each chemical equation. (a) \(\mathrm{Na}_{2} \mathrm{~S}(a q)+\mathrm{Cu}\left(\mathrm{NO}_{3}\right)_{2}(a q) \rightarrow \mathrm{NaNO}_{3}(a q)+\mathrm{CuS}(s)\) (b) \(\mathrm{HCl}(a q)+\mathrm{O}_{2}(g) \rightarrow \mathrm{H}_{2} \mathrm{O}(l)+\mathrm{Cl}_{2}(g)\) (c) \(\mathr

Introductory Chemistry 5
Determine the mass (in g) of each NaCl solution that contains 1.5 g of NaCl. (a) 0.058% NaCl by mass (b) 1.46% NaCl by mass (c) 8.44% NaCl by mass

Biology 8
In eukaryotic cells, transcription cannot begin until a. the two DNA strands have completely separated and exposed the promoter. b. several transcription factors have bound to the promoter. c. the 5' caps are removed from the mRNA. d. the DNA introns are removed from the template. e. DNA nucleases ha

Physics for Scientists and Engineers, 6
Which of the following pairs of light sources are coherent: (a) two candles, (b) one point source and its image in a plane mirror, (c) two pinholes uniformly illuminated by the same point source, (d) two headlights of a car, (e) two images of a point source due to reflection from the front and back s

Anatomy & Physiology 1
Why is cartilage slow to heal? a. because it eventually develops into bone b. because it is semi-solid and flexible c. because it does not have a blood supply d. because endochondral ossification replaces all cartilage with bone

Campbell Biology 10
Unlike an earthworms metanephridia, a mammalian nephron a. is intimately associated with a capillary network. b. functions in both osmoregulation and excretion. c. receives filtrate from blood instead of coelomic fluid. d. has a transport epithelium.

Chemistry 13
The unit troy ounce is often used for precious metals such as gold (Au) and platinum (Pt). (1 troy ounce = 31.103 g.) (a) A gold coin weighs 2.41 troy ounces. Calculate its mass in grams. (b) Is a troy ounce heavier or lighter than an ounce? (1 lb =16 oz; 1 lb = 453.6 g.)

Principles of Economics 9
Many transportation systems, such as the Washington, D.C., Metro (subway), charge higher fares during rush hours than during the rest of the day. Why might they do this?