问题 填空题

用化学符号表示:(1)三个氢分子     ;(2)两个铁离子     ;(3)负二价的硫元素     ;(4)三个氢氧根离子         

答案

(1)3H2 (2)2Fe3+ (3) (4)3OH-

①二个氢分子:首先是分子,由于是非金属气态单质,所以为H2;其次是三个分子,所以数字在前.故答案为:3H2

②1个铁离子含有1个铁原子并带有3个单位的正电荷.写离子符号时,应在元素符号或原子团符号的右上角标注上一个离子所带的电荷数,且数值在前(是“1”时省略),正、负号在后,因此1个铁离子表示为Fe3+.表示粒子个数的数字写在化学符号的前面.因此2个铁离子表示为2Fe3+

③根据元素化合价的表示方法:确定出化合物中所要标出的元素的化合价,然后在其化学式该元素的上方用正负号和数字表示,正负号在前,数字在后,因此负二价的硫元素表示为 ;

④根据离子的表示方法:在表示该离子的元素符号右上角,标出该离子所带的正负电荷数,数字在前,正负符号在后,带1个电荷时,1要省略.若表示多个该离子,就在其元素符号前加上相应的数字;因此三个氢氧离子表示为:3OH-.

填空题

[A] Inventories of this stored merchandise often need to be financed. Modern marketing is therefore a coordinated system of many business activities. But basically it involves four things: selling the correct product at the proper place, selling it at a price determined by demand, satisfying a customer’s need and wants, and producing a profit for the company.

[B] Raw materials requiring little or no special treatment can be transported by rail, ship or barge at low cost. Large quantities of raw materials travel as bulk freight. But finished products that often require special treatment, such as refrigeration of careful handling, are usually transported by truck. This merchandise freight is usually smaller in volume and requires quicker delivery. Merchandise freight is a term for the transportation of manufactured goods.

[C] The terms market and marketing can have several meanings depending upon how they are used. The term stock market refers to the buying and selling of shares in corporations. As well as other activities related to stock trading and pricing. The important world stock markets are in London, Geneva, New York, Tokyo and Singapore, another tpe of market is a grocery market, which is a place where people purchase food. When economists use the word market. They mean a set of forces or conditions that determine the price of a product, such as the supply available for sale and the demand for it by consumers. The term marketing in business includes all these meanings, and more.

[D] In the past, the concept of marketing emphasized sales. The producer or manufacturer made a product he wanted to sell. Marketing was the task of figuring out how to sell the product. Basically, selling the product would be accomplished by sales promotion, which included advertising and personal selling. In addition to sales promotion, marketing also involved the physical distribution of the product to the places where it was actually sold. Distribution consisted of transportation, storage, and related services. Such as financing, standardization and grading, and the related risks.

[E] Marketing now involves first deciding what the customer wants, and designing and producing a product that satisfies these wants at a profit to the company. Instead of concentrating solely on product, the company must consider the desires of the consumer. And this is much more difficult since it involves human behavior. Production, on the other hand, is mostly an engineering problem, thus, demand and market forces are still an important aspect of modern marketing. But they are considered prior to the production process.

[F] The modern marketing concept encompasses all of the activities mentioned, but it is based on a different set of principles. It subscribes to the notion that production can be economically justified only by consumption. In other words, goods should be produced only if they can be sold. Therefore, the producer should consider who is going to buy the product. Or what the market for the product is before production begins. This is very different from making a product and then thinking about how to sell it.

[G] Because products are often, marketed internationally, distribution has increased in importance. Goods must be at the place where the customer needs them or brought there. This is known as place utility, it adds value to a product. However, many markets are separated from the place of production. Which means that often both raw materials and finished products must be transported to the points where they are needed.

[H] Along all points of the distribution channel various amounts of storage are required. The time and manner of such storage depends upon the type of product.

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