问题 填空题

(I)在铝热反应 Fe2O3+2Al

 高温 
.
 
2Fe+Al2O3 中,作为氧化剂的物质是______(填化学式),作为还原剂的物质是______(填化学式);

(II)Zn粒和稀盐酸反应一段时间后,反应速率会减慢,当加热或加入浓盐酸后,反应速率明显加快.由此判断,影响化学反应速率的因素有______和______;

(III)原电池是一种将______能转化为______能的装置.在Cu-Zn原电池中,Zn极发生______反应,电极反应式为______.

答案

(I)Fe2O3+2Al

 高温 
.
 
2Fe+Al2O3,该反应中元素的化合价变化为:Fe2O3→Fe,铁元素由+3价→0价,得电子发生还原反应,所以Fe2O3是氧化剂;Al→Al2O3,铝元素由0价→+3价,失电子发生氧化反应,所以Al是还原剂.

故答案为:Fe2O3;Al.

(II)Zn粒和稀盐酸反应一段时间后,反应速率会减慢,当加热或加入浓盐酸后,反应速率明显加快.根据此现象判断,反应速率与反应物的浓度、温度有关.

故答案为:温度;浓度.

(III)原电池的定义:把化学能转变为电能的装置;在Cu-Zn原电池中,Zn失电子变成离子进入溶液,所以锌发生氧化反应,电极反应式为Zn-2e-=Zn2+

故答案为:化学;电;氧化;Zn-2e-=Zn2+

阅读理解

Australian colour consultant(顾问)Kylie Bartnicki is talking with a group of women in Pudong, Shanghai, who are interested in how colours affect people's confidence and help form(形成)people's first impressions(印象).

Kylie traces(追溯)back her interest in colours to when she went for her first job interview at age 18. "My mother bought me a new red top to wear to my interview and she said, "Wear this, and it will be lucky."' Kylie recalls. "I wore it, had a great interview and got the job. Ever since then I started thinking about how powerful the colour is, how it makes us look and how it makes us feel."

"When we wear clothes in a good colour, the colour will make our skin, hair and eyes shine and we look happy and smart," Kylie says.

Winter and summer are "cool colourings" and autumn and spring are "warm colourings". Someone who loves "cool colouring" might have red or golden hair, brown eyes and gold or yellow skin.

Chinese women belong to the "autumn season" if they have darker, peachy skin. Chinese women belong to the "winter season" if they have pale skin. Kylie says that Chinese women who have dark eyes and dark hair will look best in deep, rich colours. Light pinks and blues should be  avoided because they may wash our Chinese skin tones(肤色).

Their talk usually lasts one and a half to two hours and costs 600 yuan (89 dollars). Kylie says her customers(客户) are as young as five years old and as old as 90. The customers between their 30s and 50s always want some fresh ideas on developing their own personal style.

小题1:Chinese women who have dark eyes and dark hair won't look beautiful in_______.

A.purple

B.red

C.deep green

D.light blue小题2:A mother and her daughter need to pay___ to get the advice from Kylie for their 2-hour talk.

A.$89

B.$120

C.$178

D.$600小题3:Which of the following is NOT true according to the passage?

A.Wearing clothes in a good colour will make us look happy.

B.When Kylie was 18, she started to be interested in colours.

C.Kylie's customers are in between their 30s and 50s.

D.Autumn and spring are "warm clourings".

问答题 简答题