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CH2_Study_Questions

CH2_Study_Questions - Chapter 2 The Chemical Context of...

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1 Chapter 2 The Chemical Context of Life – Practice Questions Multiple Choice Questions 1) About 25 of the 92 natural elements are known to be essential to life. Which four of these 25 elements make up approximately 96% of living matter? A) carbon, sodium, chlorine, nitrogen B) carbon, sulfur, phosphorus, hydrogen C) oxygen, hydrogen, calcium, sodium D) carbon, hydrogen, nitrogen, oxygen E) carbon, oxygen, sulfur, calcium Answer: D Topic: Concept 2.1 Skill: Knowledge/Comprehension 2) Trace elements are those required by an organism in only minute quantities. Which of the following is a trace element that is required by humans and other vertebrates? Topic: Concept 2.1 Skill: Knowledge/Comprehension 3) Three or four of the following statements are true and correct. Which one, if any, is false ? If all the statements are true, choose answer E. Topic: Concept 2.1 Skill: Knowledge/Comprehension 4) Which of the following statements is false ? Topic: Concept 2.2 Skill: Knowledge/Comprehension 5) Each element is unique and different from other elements because of the number of protons in the nuclei of its atoms. Which of the following indicates the number of protons in an atom's nucleus? A) atomic mass B) atomic weight C) atomic number D) mass weight E) mass number Answer: C Topic: Concept 2.2 Skill: Knowledge/Comprehension
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2 6) The mass number of an element can be easily approximated by adding together the number of __________ in an atom of that element. Topic: Concept 2.2 Skill: Knowledge/Comprehension
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