Organic molecules, including the molecules of life, have at least one functional group. What is a functional group? How do functional groups affect the properties of molecules?
What will be an ideal response?
A functional group is an atom (other than hydrogen) or small molecular group covalently bonded to a carbon atom of an organic compound.
Functional groups impart chemical properties such as acidity or polarity. The chemical behavior of the molecules of life arises mainly from the number, kind, and arrangement of their functional groups.
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The fundamental force that is the weakest of the four is
A. strong force. B. weak force. C. electromagnetic force. D. gravitational force.
Which of the following is a reason to build an observatory in space?
A. to avoid atmospheric blurring B. They are much less expensive than ground-based observatories. C. They can last forever. D. There is no good reason to build a space-based observatory.
Two objects of different mass are released simultaneously from the top of a 20-m tower and fall to the ground. If air resistance is negligible, which statement best applies?
a. The greater mass hits the ground first. b. Both objects hit the ground together. c. The smaller mass hits the ground first. d. No conclusion can be made with the information given.
An electron is accelerated from rest through a potential difference. After acceleration the electron has a wavelength of 880 nm
What is the potential difference responsible for the acceleration of the electron? (h = 6.626 × 10-34 J ? s, melectron = 9.11 × 10-31 kg, e = 1.6 10-19 C) A) 1.9 × 10-6 V B) 1.7 × 10-6 V C) 2.2 × 10-6 V D) 2.5 × 10-6 V