Assignment 2 SCH4U Madina 2017

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University of Toronto *

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138H1

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Chemistry

Date

Oct 30, 2023

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3

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Properties of Matter SCH4U Student’s Name : Date: ASSIGNMENT - 02 Knowledge / Understanding Thinking/Inquiry Communication Application Marks 4 6 4 6 20 Identify the letter of the choice that best completes the statement For each question, select the best answer from the four alternatives. ( K=4). 1. Which of the following is NOT used to determine an electron configuration for an atom? a. Heisenberg’s uncertainty principle b. Hund’s rule of maximum multiplicity c. the Pauli exclusion principle d. the Aufbau principle 2. The arrangement f electrons around the nucleus of an atom is known as a. Bohr model b. ground state c. diagonal rule d. electron configuration 3. Which of the following models was developed to replace Bohr’s atom model? a. quantum mechanics b. theory of relativity c. transition model d. spectroscopy 4. Why do energy level exist in an atom? a. electrons are negatively charged b. electrons are attracted to certain numbers of neutrons Page 1 of 3
Properties of Matter SCH4U c. electrons are able to possess any range of energy d. electrons are only able to possess quanta of energy 5. Indicate whether the following sentence or statement is true or false. If false, change the identified word or phrase to make the sentence or true statement. (T/I- 1x2=2) i. Transition metals are monovalent because they attempt to get more stable electron configurations like half- filled and empty orbitals. ii. All alkali earth metals have valence electrons in S orbitals when they are in their ground state. 6. What are the allowed values of l and m quantum numbers if n=2? What is the total number of orbitals and their names in these energy levels? ( T/I=3) 7. Fill in the following table of history. (Comm. 5) Scientist Key experiment he did or explained Brief explanation of results J.J. Thomson Gold foil Page 2 of 3
Properties of Matter SCH4U Scientist Key experiment he did or explained Brief explanation of results Einstein 8. What is meant by a quantum of energy? (Application 2) 9. Explain how the discovery of photon leads to Bohr’s model of atom? (Application 2) 10. Propose an electron configuration for the valence shell of Fe 3+ and explain. (App 2) Page 3 of 3
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