For the following balanced equation, which has the highest coefficient?
4 H2 + 2 C ? 2 CH4
A) H2
B) C
C) CH4
D) H4
E) none of the above
Answer: A
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The magnitude of the total negative charge on the electrons in 1 kg of helium (atomic number 2, atomic mass 4) is:
A) 48 C B) 2.4 × 107 C C) 4.8 × 107 C D) 9.6 × 107 C E) 1.9 × 108 C
Which planet has the highest average surface temperature and why?
A) Mercury, because it is closest to the Sun B) Mercury, because of its dense carbon dioxide atmosphere C) Venus, because of its dense carbon dioxide atmosphere D) Mars, because of its red color E) Jupiter, because it is so big
The EM wave that has the smallest wavelength in this list is
a. ultraviolet. b. infrared. c. x-rays. d. microwave. e. gamma rays.
The speed of a bullet fired from a gun will be about the same as the speed of the recoiling gun
A) when momentum is conserved. B) because velocity is conserved. C) when both velocity and momentum are conserved. D) if the masses of the bullet and gun are equal. E) none of the above