百度试题 结果1 题目Which of the following is an example of a chemical change? A. Melting ice B. Boiling water C. Burning wood D. Dissolving salt in water 相关知识点: 试题来源: 解析 C 反馈 收藏
A. The lobster will jump out of the water. B. The color of the lobster will get darker. C. The lobster will become larger than before. D. The blue lobster will change into a red one.2. From Paragraphs 2-3, we leam that A. astaxanthin is a red chemical B. there is no ...
根据文中They found that a chemical in the shell called astaxanthin(虾青素)causes the lobster's color to change.the redness of the astaxanthin is covered by the dark blue color of another chemical in the shell,crustacyanin(t虾青蛋白 }.可知,虾青素的红色被壳中另一种化学物质甲壳亚宁的深蓝色所...
Calculations are commonly performed for the boiling point of water. The boiling point of water is very important in many scenarios, such as for food processing and making canned foods, or using steam as a power source. The boiling point of a liquid can change based on several factors, ...
14.A critical temperature of water is100=C, its boiling point at standard atmospheric pressure.在标准大气压力下,水的沸点为100=C 15.come to the boiling point and change from a liquid to vapor.达到沸点能使液体变成汽体。 16.The materials of construction problem is eased by the lower boiling ...
What is the boiling point of water? 水的沸点是多少? It's a boiling day, isn't it? 天气真热,是吗? We felt sluggish on such a boiling hot day and could only slop around. 在如此酷热的天气下,我们动也不想动,只能懒洋洋地走。
Boiling processes are also used extensively in chemical engineering, in the food industry, in the production and fractionation of liquefied gases, and for cooling units in electronic apparatus. The mode of nucleate boiling of water is used most widely in modern steam boilers at power plants to ...
Film boiling is established around a horizontal tube that is immersed in a bulk organic reactant pool of pure methanol and ethylene glycol. Chemical reactions are promoted within the vapor layer due to a high temperature inherent to film boiling. Product gases are measured and analyzed to ...
substances present) if one considers that ‘Water is a compound of hydrogen and oxygen – H 2 O’. The learner is contending with the differences between elements, mixtures and compounds, so perhaps it is hardly surprising that such confusion exists, but what about those who have graduated in...
What property of water results from its high boiling point? What chemical element has the lowest boiling point? Which compound in each pair has the higher boiling point? What is the melting point of sulfolene? (a) \text{Br}_2 \text{ and Cl}_2 can reach to form the compound \text{Br...