【11.12-18 Weekly Question】+2 to participation score, +3~20 to correct answer score
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This post was last edited by zjp on 2015-11-20 08:05. Multiple-choice question: 2 points for active participation, 2 points for each correct answer, 12 points for selecting all answers correctly; no points for selecting incorrect answers, and no points for re-editing. Reference materials must meet ( ) conditions. A Purity of over 99.9% B Must be stored in a desiccator C Composition exactly matches the chemical formula D Stable properties and high molecular weight Correct answers: ACD
The reference material must meet the (A C D) conditions. A Purity of over 99.9% B Must be stored in a desiccator C Composition exactly matches the chemical formula D Stable in properties and has a high molecular weight
A: Purity of over 99.9%; C: Composition that matches the chemical formula exactly; D: Stable properties and a high molar mass
I believe the correct answers to this question should be A, C, and D.
A, C, D, ———————– ———————– ———————– ———————– ———————–
The reference material must meet (ACD) requirements
The reference material must meet (CAD) criteria. A Purity of over 99.9% B Must be stored in a desiccator C Composition exactly matches the chemical formula D Stable in properties and has a high molecular weight
Purity is over 99.9%; the composition of element C matches the chemical formula exactly; D has stable properties and a high molar mass