Ch. 5, 6, & 11 conversion factor, density, light, & moles **test** [70 points] honors Chem

For problems involving calculations, show your work in an organized manner, include any relevant equation (or formula and conversion factor(s)), put the proper units in your calculations / answer, and have the proper number of significant figures in your answer.

1. Solve: [10 points]

a. 2.0 + 3.00 = ________

b. 2.0 ÷ 3.00 = ___________

c. (2.5 * 10-3) - (3.5 * 10-4) = __________

2. A 45.0 g cylinder has a diameter of 5.0 mm and density of 5.0 g / mL. What is the height, in meters, of the cylinder ? [10 points]

3. What is the difference between the emission versus absorption of light, in terms of an electron’s energy level ? [5 points]

4. Write the following types of light: red, x-rays, radiowave, green, ultraviolet in terms of *ascending* order of __. [10 points]

a. energy

b. wavelength

5. What is the average atomic mass of carbon in a sample containing 85 % ^{12 }C, 10 % ^{13 }C, and 5 % ^{14 }C ? [5 points]

6. solve: [15 points]

a. 325 mg water = __ water molecules

b. 125 g calcium chloride = __ moles of calcium chloride

c. 875 milllimoles of carbon dioxide = __ grams of carbon dioxide

7. What is the empirical formula of the compound (containing carbon, hydrogen, and oxygen) based on the following information, where the combustion of 1.5 g of the compound in excess oxygen produced 1.0946 g of water and 2.676 g of carbon dioxide. [15 points]

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Ch. 5, 6, & 11 conversion factor, density, light, & moles retest [70 points] honors Chem

For problems involving calculations, show your work in an organized manner, include any relevant equation or conversion factor(s), put the proper units in your calculations / answer, and have the proper number of significant figures in your answer.

1. What is the energy of a photon of light with a wavelength of 875 cm ? [10 points]

2. The below figure represent the electron energy level in an atom (not drawn to scale). Label the arrows (a, b, c, or d) as orange, green, gamma ray, or microwave. [10 points]

figure = arrows pointing up / down among different electron energy levels

3. write your answer using scientific notation; if it’s already in scientific notation, then write “in scientific notation” [10 points]

a. 213.67 = ____________________

b. 0.000237 = __________________

c. 150.0 ÷ 7.00 = ________________

d. 7398 * 104 = _________________

e. 7398 * 10-3 = __________________

4. solve [15 points]

a. 725.0 inch

^{3 }= __ Lb. 1,234,567 μm = __ km

c. 89 nm = __ cm

5. What is the empirical formula of the compound (containing carbon, hydrogen, and oxygen) based on the following information, where the combustion of 1.5 g of the compound in excess oxygen produced 1.0946 g of water and 2.676 g of carbon dioxide. [15 points]

6. A 7.0 g object with a density of 2.2 g / cm^{3 } was added to a graduated cylinder containing 12.3 mL of water; what is the volume in the cylinder after the addition of the object ? [10 points]