问题 填空题

2008年1月,特大暴风雪袭击了我国华南地区,在这场抗击暴风雪的战斗中,融雪剂发挥了一定的作用.某公司生产的融雪剂的成分是由氯化钠、氯化镁、硫酸铜、硝酸钠中的两种或两种以上的物质组成.某兴趣小组为探究其成分设计并完成了以下初步实验:

根据上述实验推断该融雪剂的成分中,一定不含______,肯定含有的一种物质______(填写化学式).

答案

①因为含有铜离子的溶液一般为蓝色,所以融雪样品加水溶解后为无色溶液,说明该融雪剂的成分中一定不含硫酸铜(CuSO4);

②剩下的金属离子只有镁离子和钠离子,而氢氧根只有与其中的镁离子结合才能生成氢氧化镁沉淀.由图示“无色溶液加氢氧化钠溶液,过滤后为白色沉淀和无色溶液”可以判断,该融雪剂的成分中肯定含有氯化镁(MgCl2);可能含有氯化钠和硝酸钠.

故答案为:CuSO4;MgCl2

单项选择题

Gardens of Claude Monet in Giverny Flowers, color, and light are essential elements in interior decorating. And nowhere are these more evident than in the home and gardens of Claude Monet in Giverny, France. Filled with the bright, clear colors of nature, this home is a must-see for anyone who loves art, flowers, color, or decorating. It is especially remarkable because the usual decorating of the day included heavy curtains, large velvet upholstered pieces, and dark, somber interiors. Monet broke from that tradition when he moved here in 1883, enchanted by the quiet village of Vernon, rolling country hills, pretty trees and fields all laid out gracefully along the banks of the Este River. Monet was still a struggling artist when he arrived in Giverny. It was one of his paintings that had given this new arts movement its name-"Impressionism"-for the use of dabs of color on canvas, rather than sweeping brushstrokes or more classic painstaking detail. While at first reviled by critics impressionism began to grow in popularity and buy 1890 Monet’s art was selling well enough that he could afford to purchase his rented home for the price of 22,000 francs, equal to the price of just two or three of his paintings. He stayed in this home for the rest of his life, until 1926. Monet’s love of pure color is fully expressed in the decoration of his home. Outside, bright pink stucco walls contrast with forest green shutters. Inside, brilliant yellow hues brighten the dining room while lovely watery blues and greens grace the entry. In the kitchen two tones of blue burst into a riot of color, highlighted with copper pots and blue and white tiles from Rouen. On display in the dining room is the matching yellow china wares filled with a collection of blue and white china pieces as well as the yellow and blue banded dinnerware he had commissioned in his own design. In the center, a large table is set for the family and guests. A pretty fireplace at the end of the room shows off blue and white tiles under a mantle decorated simply with an arrangement of bottle green vases. Japanese prints cover the walls. The home is one room deep and about five rooms wide, each with windows overlooking the magnificent gardens where great care was taken in the planning and planting. Monet eventually expanded his land to include a small stream, pond, and water lily gardens on an adjacent properly. At one point he employed a staff of six gardeners to care for the grounds and keep the gar-dens supplied with flowering blooms. It is the gardens that seem to be the focal point of the home. Laid out in neat rows, with paths, archways, and color, Monet oversaw every de- tail. Strolling through them, one almost expects to come upon the scene of Monet paining, his wife and a child in front of his magnificent rose garden. Join us for a beautiful photo tour of Monet’s gardens.

According to the author, the gardens of Claude Monet in Giverny are ______.

A.decorated with quiet and dark designs

B.decorated with heavy curtains, large velvet upholstered pieces, and dark, somber inte-riors

C.decorated with traditional designs

D.filled with the bright, clear colors of nature

单项选择题