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

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Part I: Element Information

Here's a breakdown of how to fill in the table:

• Name: The common name of the element.

• Condensed Electron Configuration: Start with the noble gas that precedes the element in the periodic table, then list the remaining electrons in order of their energy levels.

• Metal/Nonmetal/Metalloid: Classify the element based on its properties and position on the periodic table.

Here are the answers:

• A) Cl

  • Name: Chlorine

  • Condensed Electron Configuration: [Ne]3s^23p^5

  • Metal/Nonmetal/Metalloid: Nonmetal

• B) B

  • Name: Boron

  • Condensed Electron Configuration: [He]2s^22p^1

  • Metal/Nonmetal/Metalloid: Metalloid

• C) K

  • Name: Potassium

  • Condensed Electron Configuration: [Ar]4s^1

  • Metal/Nonmetal/Metalloid: Metal

• D) Zn

  • Name: Zinc

  • Condensed Electron Configuration: [Ar]4s^23d^{10}

  • Metal/Nonmetal/Metalloid: Metal

• E) P

  • Name: Phosphorus

  • Condensed Electron Configuration: [Ne]3s^23p^3

  • Metal/Nonmetal/Metalloid: Nonmetal

Part II: Multiple Choice Explanations

1. The mass % of C in methane (CH4) is __.

   • Answer: C) 74.87

   • Explanation:

     • First, find the molar mass of carbon (C) and methane (CH4).

       • Molar mass of C = 12.01 g/mol

       • Molar mass of CH4 = 12.01 (C) + 4 * 1.01 (H) = 16.05 g/mol

     • Then, calculate the mass percentage of carbon in methane.

       • Mass % of C = (mass
         ewline of
         ewline C / mass
         ewline of
         ewline CH4) * 100 = (12.01 / 16.05) * 100 = 74.87%

2. Which of the following does not occur as diatomic molecules in its elemental form?

   • Answer: A) helium

   • Explanation:

     • Diatomic molecules are molecules composed of two atoms of the same element.

     • Helium is a noble gas. Noble gases are very stable and exist as monatomic gases (single atoms) due to their full outer electron shells.

     • Nitrogen, oxygen, and hydrogen all exist as diatomic molecules (N2, O2, H2).

3. The molecular weight of ethanol (C2H5OH) is amu.

   • Answer: D) 46

   • Explanation:

     • Calculate the molecular weight by adding the atomic weights of each element multiplied by the number of atoms of that element in the molecule.

     • Molecular weight of C2H5OH = (2 * 12.01) + (6 * 1.01) + (1 * 16.00) = 24.02 + 6.06 + 16.00 = 46.08 amu. Rounding to the nearest whole number gives 46.

4. A cube of salt measures 0.550 cm on each side. What is its volume in mm3?

   • Answer: A) 166 mm3

   • Explanation:

     • First, calculate the volume of the cube in cm3.

       • Volume = side3 = (0.550 cm)3 = 0.166375 cm3

     • Then, convert the

First calculate the volume of the cube in cm3.Volume = side3 = (0.550 cm)^3 = 0.166375 cm3

Then, convert the volume from cm3 to mm3. 1 cm =

• First calculate the volume of the cube in cm3.Volume = side3 = (0.550 cm)^3 = 0.166375 cm3

• Then, convert the volume from cm3 to mm3. 1 cm = 10 mm, so 1 cm3 = (10 mm)3 = 1000 mm3

• Volume in mm3 = 0.166375 cm3 * 1000 mm3/cm3 = 166.375 mm3

• Rounding to the nearest whole number gives 166 mm3.