Pre-AP Chemistry Unit 01 Exam 2024-2025 PDF

Science Pre-AP Chemistry Unit 01 Exam Section 1 (MCQ) Time Limit: 25 minutes Section 2 (FRQ) Time Limit: 20 minutes...

Science Pre-AP Chemistry Unit 01 Exam Section 1 (MCQ) Time Limit: 25 minutes Section 2 (FRQ) Time Limit: 20 minutes Scientific Calculator or Better Required 24-25 Pre-AP Chemistry Reference Packet Required IN CLASSROOM USE ONLY 2024-2025 The content of this exam is CONFIDENTIAL and must be kept in SECURE POSSESSION by the teacher of record for Pre-AP Chemistry. This exam and its contents are to be used for IN CLASSROOM PURPOSES only. No technology of any kind is allowed to be in student possession when this exam is being administered or reviewed during supervised instructional time with the teacher of record. Any student caught violating this policy will be penalized to the full extent the Student Code of Conduct allows for academic dishonesty. SY 2024-2025 Unit 01 Exam – Atomic Structure PreAP Chemistry This page intentionally left blank. SY 2024-2025 Unit 01 Exam – Atomic Structure PreAP Chemistry Section 1 – Multiple Choice (12 questions | 24 points | 25 minutes) Directions: Use your Pre-AP Chemistry Reference Packet when taking this assessment. This assessment was designed with the assumption that the information in the reference packet is available to you at all times, and it will directly affect your success if you choose not to use it. 1. Use your periodic table to determine which symbols represent different isotopes of the same element. A. Carbon-14 and N-14 B. and O-18 131 C. I-131 and 53 𝐼𝐼 D. Rn-222 and Ra-222 2. Which table most accurately describes subatomic particles? A. B. Contributes Contributes Contributes Charge Contributes Charge Significant Mass Significant Mass neutrons protons protons neutrons electrons electrons neutrons electrons C. D. Contributes Contributes Contributes Charge Contributes Charge Significant Mass Significant Mass protons neutrons protons protons electrons electrons neutrons electrons 3. Which of the following has the greatest mass (in grams)? A. One mole of silver (Ag) atoms B. One mole of lithium (Li) atoms C. One mole of uranium (U) atoms D. All elements have the same mass since they all contain one mole of atoms SY 2024-2025 Unit 01 Exam – Atomic Structure PreAP Chemistry 4. Use the periodic table to determine which mass spectrum below most likely represents antimony (Sb). A. B. C. D. 5. Which of the waves shown above represents the photon that has more energy than the other? A. Wave A has more energy. B. Wave B has more energy. C. Both waves have the same amount of energy. D. There is not enough information given to determine which wave has more energy. SY 2024-2025 Unit 01 Exam – Atomic Structure PreAP Chemistry 6. The valence shell is made up of which subshell types in a single energy level? A. s and p B. s and d C. p and d D. d and f Use the periodic table and the model of the neutral atom provided to answer the next two questions. 7. Which group number does the atom in the diagram belong to? A. 2 B. 4 C. 16 D. 18 8. Which of the following has the same number of valence electrons as the atom in the diagram? A. Neon (Ne) B. Phosphorus (P) C. Selenium (Se) D. Iodine (I) 9. How many moles of potassium are contained in 9.02 ×1023 atoms? A. 9.03 moles K B. 6.02 moles K C. 2.00 moles K D. 1.50 moles K water 10. A student conducts a flame test on an unknown chloride salt, and a red photon of light is observed. The photon is assumed to have a wavelength of 6.3 x 10-7 m. What is the frequency of the red photon emitted? 1 A. 2.1 x 10−15 s 1 B. 189 s 1 C. 3.0 x 108 s 14 1 D. 4.8 x 10 s SY 2024-2025 Unit 01 Exam – Atomic Structure PreAP Chemistry 11. Which electron configuration below represents titanium (Ti)? A. 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 4d² B. [Kr] 4s² 3d² C. [Ar] 4s² 4d² D. [Ar] 4s² 3d² 12. Which Bohr model most accurately depicts the excitation of an electron due to the absorption of energy? A. Energy B. Energy Quantum Quantum Jump Jump C. D. Energy Energy Quantum Quantum Jump Jump SY 2024-2025 Unit 01 Exam – Atomic Structure PreAP Chemistry Section 2 – Free Response (2 questions | 20 minutes | 13 points) Student ID Number: Directions: For each question, show your work in the space provided. For calculations, clearly show the method used and the steps involved in arriving at your answers. Pay attention to units and rounding included in numerical answers. Any answers provided with inadequate work shown will receive a score of zero points. 13. A sample of manmade magnesium is evaluated using mass spectrometry. Use the information provided to answer the following questions. Show all work when any mathematical routine is needed to find the answer. (a) Complete the table for the isotope of magnesium (Mg) identified below. (2 pts)  Complete the nuclear symbol.  Determine the mass number, the number of protons, and the number of electrons. Isotope Notation Atomic Mass Isotope Protons Neutrons Electrons (Nuclear Symbol) Number Number Mg – 25 Mg 12 13 (b) The sample of magnesium to be tested is 12.5 g. Determine the number of atoms using the information given on the periodic table. (3 pts)  Use dimensional analysis to determine your answer.  Show complete set up for dimensional analysis, including units.  Round your final answer to the hundredths (0.01) place and include proper units. Q13 (b): (c) A diagram of the path each isotope of magnesium took through the mass spectrometer is shown below. Circle the location on the diagram where the lightest/lowest mass isotope of Mg hits the detector. (1 pt) SY 2024-2025 Unit 01 Exam – Atomic Structure PreAP Chemistry Angle of Isotope Deflection Magnesium – 24 45° Magnesium – 25 35° Magnesium – 26 25° (d) The stable isotopes of magnesium and their expected angle of deflection in the mass spectrometer are included in the table above. Explain why Magnesium - 24 has the largest angle of deflection. (1 pt) (e) Two different samples of magnesium were run through a mass spectrometer. The resulting mass spectrum graphs are shown below. MAGNESIUM SAMPLE 1 MAGNESIUM SAMPLE 2 Are these two samples of magnesium more likely to have been collected from the same source or from different sources? Justify your answer using specific evidence from the two spectra. (1 pt) Circle one: Same Source Different Sources (f) Would magnesium Sample 1 or 2 result in a higher average atomic mass? Explain your answer. (1 pt) Circle one: SAMPLE 1 SAMPLE 2 SY 2024-2025 Unit 01 Exam – Atomic Structure PreAP Chemistry 14. A student conducted a flame test to determine the identity of an unknown chloride salt. Use the information provided to answer the following questions. Show all work when any mathematical routine is needed to find the answer. Salt Flame Color (metal + nonmetal) SrCl2 Red KCl Lavender LiCl Hot Pink CuCl2 Blue-Green Li2SO4 Hot Pink water SrO4 Red (a) Using the collected data above, determine whether the color change observed during the flame test is due to the metal (first element) or the nonmetal (second element) in a salt compound. Compare and contrast data from the table to justify your answer. (1 pt) Circle one: METAL NONMETAL (b) A lavender flame is observed when the unknown chloride salt is tested. The frequency of a lavender flame 1 is 7.14 x 1014. Determine the amount of energy, in Joules (J), of the emitted lavender photon. (3 pts) s  You may use dimensional analysis OR the equation in your reference packet to determine the answer.  Write the equation you intend to use and identify all of your variables with units before solving.  Round your final answer to the hundredths (0.01) place.  Write your final answer in the box provided rounded correctly and with appropriate units. E=