What is the name of the earthquake scale that gives an absolute measure of the energy released by an earthquake?
a. Modified Mercalli scale
b. Mohs scale
c. Torino scale
d. Richter scale
d
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What is the probability of rolling either a 7 or 11 on a single roll of a pair of dice?
a. 1/6 b. 2/9 c. 3/8 d. 1/3 e. 1/2
A major source of chlorine gas, ci2, is from the electrolysis of brine, which is concentrated salt water, NaCI(aq). What is the sign of the electrode where the chlorine gas is formed? Is it negative or positive?
A) Positive, since the chloride ions lose electrons to form chlorine molecules. B) Negative, since the chlorine gas needs to deposit electrons to form chloride ions. C) Neither, since chlorine gas is a neutral molecule, there is not electrode attraction. D) Both, since the chloride ions from NaCl (aq) are attracted to the positive electrode to form chlorine molecules while the produced chlorine gas molecules move to deposit electrons at the negative electrode.
What is the change in entropy (DS) when two moles of silver (108 g/mole) is completely melted at 961°C? (The heat of fusion of silver is 8.82 × 10^4 J/kg.)
a. 5.53 J/K c. 15.4 J/K b. 7.72 J/K d. 12.1 J/K
Which type of nebulae is produced when short-wavelength scatters from the dust and displays a blue hue?
a. emission nebulae b. H I c. reflection nebulae d. dark nebulae e. spectral type B6