A likely ratio of the masses of oxygen in two different compounds of tin and oxygen, both of which contain the same mass of tin, is
a. 1.42 to 1.
b. 3.11 to 1.
c. 3.77 to 1.
d. 2 to 1.
d
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Why is continental crust lower in density than seafloor crust?
A) Continental crust is made of rock, while seafloor crust has more metals. B) Continental crust is made from volcanic rock called basalt, which is lower in density than what the seafloor crust is made from. C) Continental crust is made from remelted seafloor crust and therefore only the lower-density material rises to form it. D) Continental crust is actually denser than seafloor crust. E) Seafloor crust is more compact due to the weight of the oceans, but it is made of the same material as the continental crust.
The figure shows a graph of the acceleration of an object as a function of the net force acting on it. The mass of this object, in grams, is closest to
A) 130. B) 11. C) 89. D) 8000.
Complete the following nuclear decay equation:
Na + ________ ? Ne
Based on the number of galaxies visible in the Hubble Deep Field (Figure 16.1 in your textbook), the estimated number of galaxies in our observable universe is about ________
A) 50,000 B) 100 million C) 100 billion D) Infinity