Chemistry Past Paper PDF

## Topics 1.4 Electronic Configuration and 1.5 Types of chemical bonds ### Section I. Multiple Choice Questions **Instructions:** Identify and underline the correct answer. (2 points each, 20 points in total) 1. Which type of bond is formed when aluminum (Al) is combined with oxygen (O)? - A)...

## Topics 1.4 Electronic Configuration and 1.5 Types of chemical bonds ### Section I. Multiple Choice Questions **Instructions:** Identify and underline the correct answer. (2 points each, 20 points in total) 1. Which type of bond is formed when aluminum (Al) is combined with oxygen (O)? - A) Covalent - B) Metallic - C) Ionic - D) Amorphous 2. After constructing the electron configuration for fluorine (F) with atomic number (Z=9), and according to Pauli's exclusion principle, we can conclude that: - A) 2 or 3 electrons with opposite spin may occupy the same orbital. - B) 3 electrons with the same spin may occupy the same orbital. - C) only 2 electrons may occupy an orbital and they must have opposite spin. - D) 3 electrons with opposite spin may occupy the same orbital. 3. State one characteristic of covalent bonds. - A) Sharing of electrons - B) Transferring of electrons - C) Formed between two metals - D) Formed between one metal and one non-metal 4. The sublevel or subshell that contains one orbital is: - A) p - B) s - C) d - D) f 5. Identify the element which the following Lewis structure belongs to: - A) Hydrogen - B) Fluorine - C) Carbon - D) Neon 6. The information we can obtain from the element with the following electron distribution is: - 1s² 2s² 2p² 2p² 2p² - I. It is located in Group IV A. - II. The name of the element is Calcium (Ca). - III. It is located in Period 4. - IV. It is classified as a representative element. - A) Only II is correct. - B) Only I, II, and IV are correct. - C) Only II and III are correct. - D) Only I and IV are correct. 7. The type of chemical bond between nitrogen (N) and oxygen (O) is: - A) Metallic - B) Covalent - C) Amorphous - D) Ionic 8. The electron configuration of sulfur (S) is: - A) 1s², 2s², 2p⁶, 3s², 3p⁶, 4s² - B) 1s², 2s², 2p⁶ 3s², 3p⁴ - C) 1s², 2p⁶, 3s², 3p⁶ - D) 1s², 2s², 2p⁶, 3s², 3d⁴ 9. Which pair of elements is more likely to form an ionic compound? - I. Calcium and oxygen - II. Potassium and bromine - III. Sodium and magnesium - IV. Aluminum and sodium - A) Only I y ll - B) Only III - C) Only I, II and IV - D) Only I y IV 10. Identify the true statement about the element whose electron distribution is: - 1s² 2s² 2p² 2p² 2p² 3s² 3p¹ 3p¹ 3p¹ - A) The element is phosphorous (P), with 5 valence electrons. - B) The element is phosphorous (P), with 3 valence electrons. - C) The element is sulfur (S) and it is located in period 3. - D) The element is silicon (Si) and has 5 valence electrons. ### Section III. Open questions **Instructions:** Answer the questions clearly in the space provided. (10 points) 1. Describe the octet rule. (3 points) - Describe: Give a detailed account. - Each element should contain 8 electrons to be complete. 2. Describe the Pauli Exclusion Principle. (3 points)  - Describe: Give a detailed account - Electrons must spread out before putting up with another one. 3. State the formula for the following compounds (4 points): - a) calcium chloride - b) aluminum sulfite. - State: Give a specific name, value or other brief answer without explanation or calculation. - CaCl₂  - Al₂(SO₃)₃ "This is my own work and was carried out in strict adherence to the honor code; any text or"