[Soda Ash Knowledge] Daily Question (43) 11/15/2009
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Please hide the reply; no scoring will be given in principle if it is not hidden. Specific hiding method: http://bbs.hcbbs.com/viewthread.php?tid=492556&highlight=%D2%FE%B2%D8 Posts that have been edited are not rated. (The questions in this issue are taken from page 72 of \"Technical Worker Training Question Bank – Soda Ash Production Operators.\" An electronic version of this book is available for download at the soda ash information sharing site: http://bbs.hcbbs.com/thread-13140-1-2.html) True or False questions: 1. The ammonia-soda process for producing soda ash uses limestone and crude salt as raw materials, while the double-salt process uses salt, ammonia, and carbon dioxide as raw materials. （ ） 2. The higher the sensitivity of a balance, the better its stability. （ ） 3. The greater the deflection of the pointer on an analytical balance, the higher its sensitivity. （ ） 4. When the same person uses the same method to analyze the same sample, good repeatability and reproducibility of the results indicate a high degree of accuracy. （ ） 5. When preparing limestone samples, it generally involves four steps: crushing, screening, mixing, and sampling. ( )
1. The ammonia-alkali process for producing soda ash uses limestone and raw salt as raw materials, while the combined-alkali process uses salt, ammonia, and carbon dioxide as raw materials. (∨) 2. The higher the sensitivity of a balance, the better its stability. (×) 3. The greater the deflection of the pointer on an analytical balance, the higher its sensitivity. (∨) 4. When the same person uses the same method to analyze the same sample, good repeatability and reproducibility of the results indicate a high degree of accuracy. (×) 5. When preparing limestone samples, it generally involves four steps: crushing, screening, mixing, and sampling. (∨) 1# chen3jun