In a chemistry experiment,our teacher showed us how iron when it was heated. A. expanded B. contracted C. rusted D. formed 相关知识点: 试题来源: 解析 A 答案A 解析 本题考查的是动词辨析。expand膨胀;contract收缩;rust生锈;form形成。句意为:在化学实验课上,我们的老师向我们演示铁是怎样受热...
How can the mixture of iron fillings and sulphur be separated? Describe how cyclotrons work. Why does transmutation occur? What is condensation polymerization? Give an example. How can you separate NiCO_3 from NaCO_3? Explore our homework questions and answers library ...
Norman Larsen, an employee of the newly formed Rocket Chemical Company, created WD-40 in 1953. It was produced specifically for use in the aerospace industry. Aerospace contractor Convair was the first to use WD-40, applying it to the outer skin of the Atlas Missile to protect it from rust...
Iron is a brittle, hard substance, classified as a metal inGroup 8 on the Periodic Table of the Elements. The most abundant of all metals, its pure form rapidly corrodes from exposure to moist air and high temperatures. Iron is also the fourth most common element in Earth's crust by we...
How are ecosystems formed? How do minerals form by evaporation? How was water created? How are sedimentary rocks formed through chemical processes? How can nitrogen and oxygen be separated? How are coral reefs formed? How is iron ore formed? How is oxygen produced commercially? How do nitrite...
Unlike traditional armor, this soft body armor is not made out of pieces of metal; it is formed from advanced woven fibers that can be sewn into vests and other soft clothing. Hard body armor, made out of thick ceramic or metal plates, functions basically the same way as the iron suits...
a mixture containing oils or fats and other substances, especially formed into small regularly-shaped pieces and used in washing. He found a bar of soap and began to wash his hands.jabón verb to rub with soap. She soaped the baby all over.enjabonarˈsoapy adjective 1. covered with, or...
five girls share a room which is only approximately 20 square meters large. There are two double-decker beds in the room and one single deck bed with three desks under it. The other two desks are connected to the wall on one side of the room. There are two iron-made cupboards and eac...
A large sea once covered the central part of Canada and the climate was very tropical. In time, sedimentary rocks formed there. That is why we find dinosaur fossils in Alberta and the area is a good source of natural fuels. Sedimentary rocks cover 75% of the earth’s surface. Most of...
tiny particles of wood that are formed from sawing or sanding wood grass clipping –n. the cut grasses that are left behind—or captured in a grass catcher—by your mower when you cut your lawn straw –n. the dry stems of wheat and other grain plants landscape fabric –n. a textile ...