題目列表(包括答案和解析)
24.人體中含量最多的元素與地殼中含量最多的金屬元素形成的化合物的化學(xué)式__________。
23.人類生命活動離不開的氣態(tài)單質(zhì)是____________、液態(tài)氧化物是________?諝赓|(zhì)量指標(biāo)中含量二氧化硫過多會引起__________。
22.有20g氫氣和氧氣的混合氣體,點(diǎn)燃爆炸后得到18g水,氧氣已經(jīng)完全反應(yīng),則原混合氣體中氫氣的質(zhì)量可能為····························································································································· [ ]
A.8 g B.4 g C.16 g D.1 g
21.t℃時,向飽和溶液中加入一定量的水后,下列有關(guān)該溶液的敘述正確的是····· [ ]
A.仍為飽和溶液 B.溶質(zhì)的質(zhì)量變小
C.溶質(zhì)的溶解度不變 D.溶質(zhì)的質(zhì)量分?jǐn)?shù)不變
20.在配制一定溶質(zhì)質(zhì)量分?jǐn)?shù)的溶液時,正確的操作順序是·································· [ ]
A.計算、稱量、量取、溶解 B.溶解、稱量、量取、計算
C.計算、溶解、稱量、量取 D.溶解、計算、稱量、量取
19.將氮?dú)、一氧化碳、二氧化碳的混合氣體先通過足量澄清的石灰水、再通過足量灼熱的氧化銅,最后剩余氣體是····························································································································· [ ]
A.氮?dú)狻 ?B.二氧化碳 C.一氧化碳 D.二氧化碳和氮?dú)?/p>
18.在氧化-還原反應(yīng)CO+CuOCO2+Cu中,氧化劑是·························· [ ]
A.CuO B.C C.CO D.Cu
17.有100克溶質(zhì)質(zhì)量分?jǐn)?shù)為5%的食鹽溶液,若將其溶質(zhì)的質(zhì)量分?jǐn)?shù)提高到20%,則采取的措施是 [ ]
A.蒸發(fā)55克水 B.蒸發(fā)75克水 C.加入5克固體食鹽 D.加入15克固體食鹽
16.在氫氣還原氧化銅的實(shí)驗(yàn)中,進(jìn)行如下操作:①加熱②停止加熱③通入氫氣④停止通入氫氣。下列操作順序正確的是 [ ]
A.③①④② B.①③②④ C.③①②④ D.①③④②
15.大氣中的臭氧層能吸收來自太陽輻射的紫外線,保護(hù)地球上的生物。有關(guān)臭氧(O3)
的下列說法中,錯誤的是······················································································· [ ]
A.臭氧和氧氣是同一種物質(zhì) B.每個臭氧分子中有3個氧原子
C.臭氧由氧元素組成 D.臭氧中氧元素是游離態(tài)
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