Chemical properties determine the behavior of substances. Which of the following is a chemical property that affects the reactivity of a substance? A. Color B. Melting point C. Solubility D. Electronegativity 相关知识点: 试题来源: 解析 D。电负性影响物质的反应性,是化学性质。颜色、熔点和溶解性...
{{B}}Passage One{{/B}}Which of the following is the substance mentioned that helps to protect against heart disease A.Lipoproteins.B.Cholesterol.C.Both.D.Neither. 相关知识点: 试题来源: 解析 A 细节题。根据在第三段“Studies have shown that moderate drinkers have higher levels of highdensi...
Which of the following is the correct term for a substance that undergoes a chemical change in a reaction? A. Reactant B. Product C. Catalyst D. Solvent 相关知识点: 试题来源: 解析 A。本题考查化学术语。“Reactant”指反应物,是在化学反应中发生变化的物质。“Product”是产物,是化学反应生成...
百度试题 结果1 题目 Which of the following words has the meaning of " a substance that improves the chemical activity of an enzyme"?A.coenzymeB.auxinC.elementD.accelerant 相关知识点: 试题来源: 解析 A 反馈 收藏
A. change B. permanence C. appearance D. behavior 相关知识点: 试题来源: 解析 B。“substance”在哲学中通常与“permanence”(永恒、持久)相关,指的是一种持久不变的本质。“change”是变化;“appearance”是外表;“behavior”是行为,都与“substance”的哲学概念不太相关。反馈...
Which of the following substance can NOT be found directly from an old ventilation system? A. Chemical disinfectants. B. Bacteria. C. Fungi. D. Pentachlorophenol. 相关知识点: 试题来源: 解析 D 正确答案:D 解析:细节题。倒数第二段第二句指出,在旧式空调系统中,用于循环的水储存在特制的贮液器中...
Which of the following substances can react with oxygen to produce a new substance? A. Water B. Salt C. Iron D. Gold 相关知识点: 试题来源: 解析 C。铁可以和氧气发生反应生成新物质铁锈,水通常情况下不能与氧气反应生成新物质,盐和金在常见条件下也不与氧气发生反应。
There is a substance that is highly reactive. Which of the following words can best describe this property? A. stable B. inert C. reactive D. unreactive 相关知识点: 试题来源: 解析 C。本题考查化学物质性质的英语表达。“reactive”表示“易反应的、活性的”,与题干中“highly reactive”相呼应...
Which of the following is the correct statement about the ___? It is the temperature at which a substance changes from a liquid to a solid. A. boiling point B. melting point C. freezing point D. warming point 相关知识点: 试题来源: 解析 C。解析:freezing point是冰点,它就是物质从...
Which of the following is the chief substance of the cell walls of molds, and the same organic substance that encases insects with an exoskeleton? Cytoplasm matrix Chromatid granules Cellulose Chitin Here’s the best way to solve it.