1.综合题- (共1题)
I、把氯气通入含淀粉碘化钾的溶液中,可观察到的现象是:__________,说明氯单质的氧化性_______碘单质的氧化性。(填“﹤”、“﹥”或“=”)
Ⅱ、某化学兴趣小组计划用氯气和氢氧化钠制取简易消毒液。
(1)其反应原理为:(用离子方程式表示)____________。
(2)实验室配制好4.0 mol·L-1的NaOH溶液,这种溶液需要__________L才能与标准状况下2.24 L氯气恰好完全反应。
(3)配制250 mL 4.0mol·L-1NaOH溶液的实验步骤:
a、计算需要氢氧化钠固体的质量。
b、称量氢氧化钠固体。
c、将烧杯中的溶液注入容量瓶,并用少量蒸馏水洗涤烧杯内壁2~3次,洗涤液也注入250 mL容量瓶。
d、用适量蒸馏水溶解称量好的氢氧化钠固体,冷却。
e、盖好瓶塞,反复上下颠倒,摇匀。
f、继续向容量瓶中加蒸馏水至刻度线下1~2cm时,改用胶头滴管加蒸馏水至凹液面最低液而与刻度线相切。
①所需称量的氢氧化钠固体的质量是____________。
②上述步骤的正确操作顺序是___________。
③上述实验需要的仪器有:天平、药匙、烧杯、玻璃棒、__________、___________。
2.单选题- (共2题)
3.选择题- (共4题)
阅读短文,判断正误
Peter: Is this your grandmother?
Jane: Yes, this is my grandmother. Her name is Lisa Smith.
Peter: Is that your grandfather?
Jane: Yes, that is my grandfather. His name is Tony Smith.
Peter: Are they your parents?
Jane: Yes, they are my parents. Their names are Jim and Jones Smith.
Peter: Is this your sister?
Jane: Yes, she is. Her name is Gina.
Peter: Are these your brothers?
Jane: No, they aren't. They are my friends.
阅读短文,判断正误
Peter: Is this your grandmother?
Jane: Yes, this is my grandmother. Her name is Lisa Smith.
Peter: Is that your grandfather?
Jane: Yes, that is my grandfather. His name is Tony Smith.
Peter: Are they your parents?
Jane: Yes, they are my parents. Their names are Jim and Jones Smith.
Peter: Is this your sister?
Jane: Yes, she is. Her name is Gina.
Peter: Are these your brothers?
Jane: No, they aren't. They are my friends.
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【1】题量占比
综合题:(1道)
单选题:(2道)
选择题:(4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:2
7星难题:0
8星难题:1
9星难题:0