Part I. (45 points). In the spaces next to the chemical symbol write the name of the element, the condensed electron configuration, and indicate if the element is a metal, nonmetal or metalloid. Name Condensed electron configuration Metal/nonmetal/metalloid A) Cl _________ _______________________ _________________________ B) B _________ _______________________ _________________________ C) K _________ _______________________ _________________________ D) Zn _________ _______________________ _________________________ E) P _________ _______________________ _________________________ Part II. Multiple choice (3 points each = 180 points total). Please circle your answer. There is only one correct answer to each question. 1. The mass % of C in methane (CH4) is __________. A) 25.13 B) 133.6 C) 74.87 D) 92.26 2. Which of the following does not occur as diatomic molecules in its elemental form? A) helium B) nitrogen C) oxygen D) hydrogen 3. The molecular weight of ethanol (C2H5OH) is ____________ amu. A) 34 B) 41 C) 30 D) 46 4. A cube of salt measures 0.550 cm on each side. What is its volume in mm3? A) 166 mm3 B) 5.50 mm3 C) 0.166 mm3 D) 550 mm3

What is the name of the element with the condensed electron configuration [Ne]3s^23p^5?

Chlorine

What type of element is Boron classified as?

Metalloid

What is the condensed electron configuration for Potassium?

[Ar]4s^1

Which element has the condensed electron configuration [Ar]4s^23d^{10}?

Zinc

What is the mass percentage of carbon in methane (CH4)?

74.87%

Which of the following does not occur as diatomic molecules in its elemental form? A) Helium, B) Nitrogen, C) Oxygen, D) Hydrogen.

A) Helium

What is the molecular weight of ethanol (C2H5OH) rounded to the nearest whole number?

46 amu

What is the volume in mm3 of a salt cube measuring 0.550 cm on each side?

166 mm3

What is the formula to calculate the mass % of an element in a compound?

(mass of element / mass of compound) * 100