Draw reasonable resonance structures for the follow­ing

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

Biology 8
What characteristics do hagfishes have that lancelets and tunicates lack?

Anatomy & Physiology 1
Explain why CH4 is one of the most common molecules found in nature. Are the bonds between the atoms ionic or covalent?

Essentials of Human Anatomy & Physiology 11
Name the parts of a typical vertebra, and explain in general how the cervical, thoracic, and lumbar vertebrae differ from one another.

Human Anatomy & Physiology 9
Lymphocytes that develop immunocompetence in the bone marrow are (a) T lymphocytes, (b) B lymphocytes, (c) NK cells, (d) B and T lymphocytes.

Principles of Economics 6
A consumer has income of $3,000. Wine costs $3 per glass, and cheese costs $6 per pound. Draw the consumers budget constraint. What is the slope of this budget constraint?

Psychology 12
What three issues have engaged developmental psychologists?

Urban Economics 8
Leapfrog city has two rings of vacant land suitable for housing, one that is three miles from the center and a second that at the edge of the city, six miles from the center. Both rings were expected to be developed in the next year. Suppose the city imposes a new development tax of $20,000 per new h