When the equation NH4NO3? N2O + H2O is balanced, the total of all the coefficients (both written and "understood") is
a. 3.
b. 4.
c. 7.
d. 8.
b
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Simple Pendulum: What is the length of a simple pendulum with a period of 2.0 s?
A. 20 m B. 0.99 m C. 1.2 m D. 1.6 m E. 0.87 m
How do we study the region near the center of our own galaxy, the Milky Way?
A) high-resolution images acquired with visible light telescopes B) observations at radio, infrared and x-ray wavelengths C) We cannot directly observe the galactic center, so we infer its characteristics from theoretical models. D) We look at the centers of other galaxies and assume that our Milky Way's center is similar. E) We can study the galactic center only by observing gravitational waves.
What is the intensity of a 70. dB sound?
What will be an ideal response?
Heavier stable nuclei tend to have
A) half as many protons as neutrons. B) the same number of neutrons and protons. C) more neutrons than protons. D) no clear trend in the relative number of neutrons and protons. E) more protons than neutrons.