1.计算题- (共1题)
(1)RSO4中R的化合价为 ;
(2)制得的氢气可用浓硫酸干燥,原因是 ;
(3)通过计算确定R的相对原子质量。
2.单选题- (共4题)
A. 铁粉与稀盐酸混合后有大量气泡产生:2Fe+6HCl=2FeCl3+3H2↑
B. 稀盐酸洒到大理石表面上有气泡产生:CaCO3+2HCl=CaCl2+H2O+CO2↑
C. 用盐酸除锈:Fe2O3+HCl=FeCl2+H2O
D. 黑色的氧化铜粉末与稀硫酸混合后,溶液变成蓝色:CuO+H2SO4=CuSO4+H2↑
A.2Fe2O3+3C![]() |
B.3Fe+2O2![]() |
C.H2CO3=H2O+CO2↑ |
D.K2CO3+CaCl2=CaCO3↓+2KCl |
A.打开盛有浓盐酸和浓硫酸的试剂瓶瓶塞,在瓶口都有白雾 |
B.稀盐酸和稀硫酸都可用于除铁锈 |
C.浓盐酸、浓硫酸都可用来干燥氧气 |
D.在稀盐酸、稀硫酸中加入碳酸钙粉末,粉末都会逐渐溶解,且液体变为黄色 |
3.选择题- (共1题)
I have a friend. He is a boy. His name is Nick. He is from England. Nick is a sports fan. He likes 1 every kind of games. He likes basketball, football, tennis, badminton 2 swimming. Nick is good at 3 football. Yang Chen is his favourite football player. Nick is a member 4 the Football Club. When he goes shopping, he always 5 newspapers 6sports and he often reads sports news. His school is very big and beautiful. There is a football tennis court and a swimming pool in his school. He usually plays football 7 his friends after school. Nick says that he wants to 8 a football player when he grows up. Nick often goes to the stadium (体育馆) to watch the football games 9 the weekend. He 10 want to miss any match.
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【1】题量占比
计算题:(1道)
单选题:(4道)
选择题:(1道)
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【2】:难度分析
1星难题:0
2星难题:0
3星难题:0
4星难题:0
5星难题:0
6星难题:4
7星难题:0
8星难题:0
9星难题:0