27. The electron configuration of a ground-state Co atom is C) [Ne]3s23d\" D) [A

Question

27. The electron configuration of a ground-state Co atom is C) [Ne]3s23d" D) [Ar]4s'3d E) [Ar]4s 4d 28. Which element has the following ground-state electron configuration? A) Sn B) Sb C) Pb D) Bi E) Te Which of the following atoms is diamagnetic in its ground-state? A) Ca B) As 29. C) Cu D) Fe B) none of these Using the figure below, categorize electromagnetic radiation with a wavelength of 1.0 x 10 m. 30. tola 100 Radio waves efranod Type of radutice u A) Gamma rays B) X rays C) Ultraviolet D) Infrared E) Microwave Page 7

Explanation / Answer

Chemistry test III:

1. C ;radiant energy is solar energy ie.energy that comes from Sun. Radiant energy is travelled by wave or particles.

2. B, thermal energy is the energy associated with random motion of atoms and molecules.

3. D; the amount of heat required =mass* specific heat *temperature difference.

= 26.9815*10.5*.9*194.5 J

=49.6kJ

4. B; the heat required =mass* specific heat * temperature difference

=(1.5*10³ g) *(4.184J/ g0C)* 47.222220C. ( 0C = 0F/1.8)

=3*10² kJ

5. A, An exothermic reaction causes the surrounding to increase the temperature.

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