问题 填空题

(10分)“从生活走进化学,从化学走向社会”。请你和小红一起回答下列问题。

(1)孝敬老人,是中 * * 的传统美德。我县九年级学生小红、小华等三十人为敬老院送去歌舞和水仙花。花香满院,请用分子的性质解释闻到花香的原因_________________。

(2)小红在冰箱里放置竹炭,有效地除去异味,这是利用了竹炭的___________性。

(3)小红家的下列厨房用品中,属于金属材料的有______(填标号)。

               

A.塑料勺     B.紫砂锅      C.不锈钢灶台          D.竹质筷子

(4)小红发现家中防盗网上的铁皮已锈迹斑斑,而同期安装的铝制栏杆仍完好如初。请解释铝制栏杆仍完好如初的原因_________________________________________________。

(5)厨房调味品架上有一袋失去标签的白色固体,可能是食盐,也可能是纯碱。为了判断其成分,小红把它带到实验室做了以下实验:

请判断此白色固体是_____________________(写化学式);写出反应②的化学方程式为

________________________________________________。

(6)小红家常用硝酸铵(化学式为NH4NO3)作万年青的肥料。硝酸铵属于___(填标号)。

A.氮肥                      B.磷肥

C.钾肥                     D.复合肥

答案

(1)分子在不断运动    (2)吸附            (3)C

(4)铝制品与氧气反应,表面形成一层致密的氧化铝保护膜等合理答案

(5)Na2CO3(写名称不给分)   Ca(OH)2+CO2=CaCO3↓+H2O   (6)A

(1)闻到香味是因为分子的不断运动,(2)活性炭净水是利用了它的吸附性,能吸附水中的一些异味和杂质;(3)不锈钢属于金属材料,(4)铝的化学性质比较活泼,能和氧气反应生成一层致密的氧化物薄膜,阻止铝与氧气的接触,对铝起到保护作用,(5)白色固体与盐酸生成气体,故白色固体为碳酸钠,(6)硝酸铵(NH4NO3)中含有植物所需的营养元素--氮元素,故属于氮肥.

填空题

Perhaps, every county suffered from inflation once or more times. Inflation is an economic condition in (B1) prices for consumer goods (B2) , and the (B3) of money or purchasing power decreases. There are three causes of inflation. The first and most important cause may be excessive government spending. For example, in order to (B4) a war or carry (B5) social programs, the government may spend more money than it has received through taxes and other revenues, thus creating a deficit. In order to (B6) this deficit, the Treasury Department can simply (B7) the money supply by issuing more paper money to (B8) the debts of government. This increase in the money supply will cause the value of the dollar to (B9) decrease. The second cause of inflation occurs when the money supply increases faster than the supply of goods. (B10) people have more money, they will run out to buy popular goods (B11) televisions and computers, for example, and a shortage will result. Industry will then produce more, at higher prices, to (B12) demand. (B13) , if people think that the prices of popular goods are going up, they will buy and even borrow money at high (B14) rates to pay for them. Finally, if labor unions demand that workers’ wages (B15) or (B16) the high cost of living, industry will meet this demand and add other costs of production on the (B17) . (B18) summary, all of these causes can (B19) inflationary problems that can affect the welfare of a nation. However, of these three causes, (B20) government spending may be the most important.

A.finance

B.offer

C.pay

D.fight

单项选择题 A1型题