Topic content:
Chemistry is closely related to human clothing, food, housing and transportation. The following statement is correct ()
A. Scientists use nanowires to weave carbon nanotube cloth, which belongs to organic polymer materials
B. Henan braised noodles are delicious and nutritious, because noodles and lean meat are rich in protein, and vegetables are rich in vitamins
C. The bicycles after the outing need to be dried and oiled on the chains after cleaning to prevent the bicycles from rusting
D. The wall brushed with lime cream becomes hard over time, because the evaporation of water leaves solid calcium hydroxide
Best answer:
A、 Carbon nanotube cloth belongs to natural material, not organic polymer material, so A is wrong;
B、 Noodles are rich in starch, which belongs to sugar, so B is wrong;
C、 The condition of iron rusting is that it contacts with oxygen and water. After cleaning, the bicycles after the outing need to be dried and the chains need to be oiled, so the purpose is to prevent the bicycles from rusting, so C is correct;
D、 The wall brushed with lime cream becomes hard after a long time because lime slurry reacts with carbon dioxide to produce calcium carbonate, rather than the evaporation of water leaving solid calcium hydroxide, so D is wrong
Therefore: C
Answer analysis:
There is no explanation for this question
Test core:
Nutrients needed by human beings: In order to maintain life and health, human beings must take food. The ingredients of food mainly include protein, sugar, oil, vitamin, inorganic salt and water, which are generally called the six basic nutrients.