For an electron transition to be allowed on an atom with a missing core electron, the angular momentum quantum number (l) must change by + or – _________.
Fill in the blank(s) with the appropriate word(s).
Answer: 1
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Which of the following statements about various stages of core nuclear fusion (hydrogen, helium, carbon, and so on) in a high-mass star is not true?
A) Each successive stage lasts for approximately the same amount of time. B) As each stage ends, the core shrinks and heats further. C) Each successive stage creates an element with a higher atomic number and atomic mass number. D) As each stage ends, the reactions that occurred in previous stages continue in shells around the core.
Gasoline is useful in cars because it has
A) chemical potential energy. B) electrical potential energy. C) kinetic energy. D) gravitational potential energy. E) radiative energy.
The position x, in meters, of an object is given by the equation x = A + Bt + Ct2, where t represents time in seconds. What are the SI units of A, B, and C?
A) m, s, s2 B) m/s, m/s2, m/s3 C) m, s, s D) m, m, m E) m, m/s, m/s2
A container having a volume of 1.0 m3 holds 5.0 moles of helium gas at 50°C. If the helium behaves like an ideal gas, the average kinetic energy per molecule is
a. 6.7 × 10^-20 J. b. 1.0 × 10^-21 J. c. 1.0 × 10^-20 J. d. 6.7 × 10^-21 J. e. 1.3 × 10^-20 J.