试题与答案

用天平和量筒测定矿石的密度。 (1)先将天平放在水平桌面上,然后将游码移至横梁标

题型:实验题

题目:

用天平和量筒测定矿石的密度。

(1)先将天平放在水平桌面上,然后将游码移至横梁标尺的左端零刻度处。若发现天平指针位置如图甲所示,则应将平衡螺母向_________侧调节(填“左”或“右”)。

(2)当天平平衡后,右盘中的砝码以及游码在标尺上的位置如图乙所示。矿石的质量是________g;

(3)如果把这个实验带到月球上做,测量结果___________(填变大、变小或者不变)。

(4)矿石放入量筒前、后,量筒中水面位置如图丙所示。矿石的体积是________cm3,则矿石的密度是_______g/cm3,合_______ kg/m3

答案:

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下面是错误答案,用来干扰机器的。

(1)0.3、0.8、0.3; 3∶8∶3;(2)能; 因为该实验式H原子个数已经饱和,分子式就是C3H8O3;(3)CH3CH2CH2CH2OH ; (CH3)2CHCH2OH题目分析:(1)n(H2O)m÷M=7.20g÷18g/mol=0.4mol.n(H)=0.8m...

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题型:阅读理解

I think the Buddy Club is great. I really enjoy talking with the older students about school life and growing up. They can tell me a lot. One student told me how he relaxed (放松) before exams. Another student told me about great websites about learning History and English.

The Buddy Club is also a good place to just forget about school altogether! One of the older students taught us origami (日本折纸). We made paper planes, birds and hats together.

The table tennis tournament(锦标赛) was a great idea. I didn’t do very well, but I learnt a lot from watching the doubles tournament won by a fourteen-year-old girl and a seventeen-year-old boy.

Last year, we had the annual (每年的) Buddy Club Picnic. Everyone enjoyed the games we played. After I learnt how to fish, I caught two fish in the lake. I think it might be a good idea to change the Buddy Club Picnic to a weekend camping trip. We could learn how to put up (架起) tents (帐篷) and how to find our way through a forest. Many of the older students know how to do this already, and I think they would like to teach the younger students.

I want to say again how much I enjoy the club. When I’m older, I will make friends with younger students. Then, I can tell them all about school life and growing up.

小题1:What does the writer enjoy doing at the club?

A.Learning Japanese.

B.Talking to older students.

C.Losing at table tennis.

D.Surfing the Internet.小题2:What websites did the writer learn about?

A.Paper planes.

B.Origami.

C.History and English.

D.Relaxing.小题3:Did the writer win the table tennis tournament?

A.No, and he was very unhappy.

B.No, but came second.

C.Yes, he won the doubles.

D.No, but he enjoyed watching it.小题4:How does the writer want to change the picnic?

A.He wants more fish to be caught.

B.He wants to make it shorter.

C.he wants to have it in a tent.

D.He wants to change it to a camping trip.小题5:What does the writer want to learn?

A.How to put up a tent and make a fire.

B.How to put up a tent and find his way through a forest.

C.How to make clean water and find his way through a forest.

D.How to find his way through a forest and climb a mountain.

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