Use the following to answer the questions below:
In each of the following multiple-choice questions, characterize EACH of the three given statements as being TRUE or FALSE and then indicate the collective true-false status of the statements using the choices:
-Statements: (1) When the formula for a compound contains parentheses it is an indication that the compound is unstable and subject to decomposition.
(2) The fact that an unknown substance reacts with chlorine is insufficient basis for classifying the unknown as a compound.
(3) All chemical symbols use a two-letter notation to represent the name of an element.
A) All three statements are true.
B) Two of the three statements are true.
C) Only one of the statements is true.
D) None of the statements is true.

Question

Quizplus · Accepted Answer

(1) is false as parentheses in a formula indicate the ratio of atoms in a compound.
(2) is true as the reaction of an unknown substance with chlorine does not necessarily indicate that it is a compound as some elements also react with chlorine.
(3) is false as some elements have one-letter symbols (e.g. H for hydrogen) while others have symbols with more than two letters (e.g. Uuo for ununoctium). Therefore, only statement (2) is true, making choice C the correct answer.

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