The quantum mechanical model of the hydrogen atom requires that if the orbital quantum number = 5, there will be how many permitted orbital magnetic quantum numbers allowed?
a. 7
c. 5
b. 15
d. 11
D
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Determine the maximum heating rate to the inner surface of the casting due to the release of heat of fusion in the molten iron.
Two experimental runs are performed to determine the calorimetric properties of an alcohol that has a melting point of -10°C
In the first run, a 200-g cube of frozen alcohol, at the melting point, is added to 300 g of water at 20°C in a styrofoam container. When thermal equilibrium is reached, the alcohol-water solution is at a temperature of 5.0°C. In the second run, an identical cube of alcohol is added to 500 g of water at 20°C and the temperature at thermal equilibrium is 10°C. The specific heat of water is 4190 J/kg•K. Assume that no heat is exchanged with the styrofoam container and with the surroundings. The heat of fusion of the alcohol is closest to A) 5.5 × 104 J/kg B) 7.1 × 104 J/kg C) 7.9 × 104 J/kg D) 6.3 × 104 J/kg E) 8.7 × 104 J/kg
This figure shows Hubble's law. If a galaxy is observed to be moving away from us at 30,000 (3 104) km/s, approximately how far away is it? (Hint: Be sure to read the axis labels carefully.)
A) 30,000 light-years B) 1400 million light-years C) 3000 million light-years D) 1400 light-years
The length and width of a rectangle are 1.125 m and 0.606 m, respectively. Multiplying, your calculator gives the product as 0.68175. Rounding properly to the correct number of significant figures, the area should be written as
A) 0.7 m2. B) 0.68 m2. C) 0.682 m2. D) 0.6818 m2. E) 0.68175 m2.