This chemistry question involves key chemical concepts and calculations. The detailed solution below walks through each step, from identifying the reaction type to computing the final answer.
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Here are the answers to the multiple-choice questions: QUESTION 1 1.1 The correct answer is B) Chlorine. Chlorine (Cl) is located in Group 17 (halogens) and Period 3 of the periodic table. 1.2 The correct answer is C) Boron. Beryllium (Be) is in Period 2. Among the options, Boron (B) is a semi-metal (metalloid) and is also found in Period 2. 1.3 The correct answer is A) The number of atoms of an element. In a chemical formula, a subscript number indicates how many atoms of the element immediately preceding it are present in one molecule or formula unit. For example, in H_2O, the subscript '2' indicates there are two hydrogen atoms. 1.4 The correct answer is D) 2:1. In a water molecule (H_2O), there are two hydrogen atoms for every one oxygen atom, making the ratio of hydrogen to oxygen 2:1. 3 done, 2 left today. You're making progress.