第九章单元测试
- Which method is used to determine the Cu content in copper methionine in this experiment? （ ）
- Which method is used to determine the methionine(蛋氨酸) content in copper methionine in this experiment? （ ）
- Which of the following statements about copper methionine(蛋氨酸铜) are correct? （ ）
- Why should temperature and acidity(酸度) be controlled when preparing copper methionine(蛋氨酸铜)? （ ）
- Because copper methionine(蛋氨酸铜) is soluble in water, use water to transfer the product remaining in the beaker when performing suction filtration(减压过滤). （ ）
A:precipitate titration B:complexation titration C:acid-base titration D:redox titration
答案:complexation titration
A:precipitate titration B:acid-base titration C:redox titration D:complexation titration
A:widely used in feed and food industry B:a chelate C:a complex compound D:high solubility in water
A:If the acidity is lower, copper ion would form precipitate(沉淀). B:If the acidity is lower, methionine would form precipitate. C:If the temperature is higher, methionine would be decomposed. D:If the temperature is higher, copper ion would be decomposed(分解).
A:对 B:错
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