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Worksheet 4 (Chapter 2) Chemistry 100 Name 1. (1) 𝑁" 𝑂$ is an example of: a. a compound. b. an element. c. a mixture 2. (2) The properties of a pure substance are defined by its and its . 3. (1) All noble gases have one particular chemical property that makes them unique. What is it? 4. (5) For a neutral atom of chlorine–35, fill in the following: number of protons number of neutrons number of electrons Finally, write the designation for this atom using the format: A ZX 5. (4) Give the electron configuration for each of the following atoms or ions. Mg 2+ Al € N 3− Ca 2+ € 6. (1) An atom or compound with a positive charge is called a cation or an anion? € € 7. (6) Give the charge that each of the following atoms are most likely to form. 𝑁𝑎 𝑀𝑔 𝐶𝑎 𝐶𝑙 𝑂 𝑁 8. (1) An electron in two atoms undergoes a energy level transition and one emits yellow light, the other green light. Which atom (A or B) emits green light? 9. (2) How many nanograms (ng) are in a sample weighing 2.25 𝑥 1012 mg? Worksheet 5 Chemistry 100 (Chapter 2 and 3) Name 1. (1) Sodium oxide is 𝑁𝑎# 𝑂 (sodium combines with oxygen in a 2:1 ration). Give the formula for a sodium compound (other than with oxygen) that is also 2:1. 2. (6) For each of the following pairs of atoms, give the formula of the ionic compound formed and name each compound: Mg and Cl Ca and O Li and N 3. (4) Write down the names for each of the following: 𝐶𝑎𝑆𝑂' 𝐿𝑖𝑁𝑂* 𝐴𝑙(𝑂𝐻)* 𝑀𝑔𝐶𝑂* 4. (4) Give the formulas for the following compounds: sodium hydroxide potassium nitrate ammonium phosphate lithium bicarbonate 5. (4) Give the name for each of the following compounds. 𝑁𝑂# 𝑃# 𝑂3 𝑆𝐶𝑙# 𝑆𝑂#
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Really great stuff, couldn't ask for more.

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