Which two elements are most likely to combine with one another to form an ionic compound?
a. B and Cl
b. Ra and Br
c. Mg and Ca
d. S and O
b
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A microwave oven operates with sinusoidal microwaves at a frequency of 2400 MHz. The height of the oven cavity is 25 cm and the base measures 30 cm by 30 cm
Assume that microwave energy is generated uniformly on the upper surface of the cavity and propagates directly downward toward the base. The base is lined with a material that completely absorbs microwave energy. The total microwave energy content of the cavity is 0.50 µJ. What is the amplitude of the electric field? (c = 3.00 × 108 m/s, ?0 = 4? × 10-7 T • m/A, ?0 = 8.85 × 10-12 C2/N • m2) A) 1600 V/m B) 1900 V/m C) 2200 V/m D) 2500 V/m E) 2800 V/m
Which of the following statements describes a polar molecule?
A) The electrons in the molecule are distributed evenly throughout the molecule. B) The molecules are usually not attracted to one another very strongly. C) Polar molecules have the weakest intermolecular interactions with ionic compounds. D) The molecules have a high degree of symmetry. E) None of these statements describe polar molecules.
What was the conclusion of Feynman's first thought experiment regarding waves and particles, in which indestructible bullets are fired from a wobbly gun at a pair of slits?
a. When both slits are open, the total of bullets in this sand is the sum of bullets shot through one slit and the other. b. A bullet through one slit affects the probability that the next bullet goes through the same slit. c. Bullets rebounding from closed slits show refraction patterns. d. When both slits are open, interference patterns keep the number of bullets from reaching the full number shot one slit and then the other. e. Three times as many bullets go through two open slits as through one and then the other.
A mole of oxygen (O2) molecules and a mole of carbon dioxide (CO2) molecules at the same temperature and pressure have
A) the same average molecular speeds. B) the same number of atoms. C) different average kinetic energy per molecule. D) the same number of molecules. E) different volumes.