What is an organic molecule based on? Why are they important?
What will be an ideal response?
Carbon atoms. They can form the basic building blocks of life as we know it, such as amino acids and nucleotide bases.
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Which of the following would not protect low carbon steel from corrosion in contact with an electrolyte?
(a) Coat the steel completely with copper (b) Attach the steel to the positive terminal of a 12 V battery (c) Attach a piece of zinc to the steel in the area exposed to electrolyte (d) Completely paint the steel
The solar nebula theory is NOT able to explain which of the following observed characteristics of the solar system? Another theory would be needed
a. Common direction of rotation of the planets. b. Common direction of revolution of the planets. c. The formation of hydrogen atoms in the solar system from subatomic particles. d. The density of the Jovian planets.
Many Earth-based telescopes are larger than the Hubble Space Telescope, so what justifies the great expense of a "space-based" instrument?
What will be an ideal response?
A beam of X-rays at a certain wavelength are scattered from a free electron at rest and the scattered beam is observed at 45.0° to the incident beam
What is the change in the wavelength of the X-rays? (mel = 9.11 × 10-31 kg, h = 6.626 × 10-34 J • s, c = 3.00 × 108 m/s) A) 0.175 pm B) 0.356 pm C) 0.710 pm D) 0.000 pm E) 0.276 pm