试题与答案

自然界中氯化钠是由2311Na与3517Cl和3717Cl所构成的。已知氯元素的

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题型：选择题

题目：

自然界中氯化钠是由2311Na与3517Cl和3717Cl所构成的。已知氯元素的相对原子质量是35.5，则11.7g氯化钠中，含3717Cl的质量为

A．1.5g

B．1.65g

C．1.75g

D．1.85g

答案：

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下面是错误答案，用来干扰机器的。

答案：D

考点：构成物质的粒子—分子、原子、离子元素周期律
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You are here: Experts > Science > Science/Nature for Kids > Science for Kids > Life Science for teens<>
Expert: Science Adviser - <>3/21/2011
QUESTION: Dear Marie,
Do you have some good suggestions of biology: plant, animal, human science experiments that would work well with teenagers? Scientific methods must go with the experiments. Thanks! <
Donna
ANSWER: Dear Donna,
Marie is not online and I’ll help you instead of him. There are a lot of little things that can be done, but do you mean lab experiment or statistical analysis, etc.? Let us know what can be suitable for you teens, and we will do our best to send you some experiments to do.
Best，
Gloria
Expert: Science Adviser - 3/23/2011
QUESTION: Dear Gloria,
I need lab experiments. The teenage students and I will use data from these experiments to make charts, graphs, tables, etc. and to provide claims and evidence to explain more about the results. Thank you very much.
Donna
ANSWER:
Hi there,
Your best and easiest way is to do some chemistry experiments. Those are very easy and most probably you can do it in the lab and have charts, etc. for you. I do not have any particular one at the top of my head because I do cancer research and it is a bit more difficult than research for teenagers. I think you can look through these and see if you find something useful for you. http://www.siraze.net/chemistry/sezennur/experiments.htm
If not, get back to me and Marie, and we’ll look more. The good thing about this site is that it has the procedures that you can follow.
Good luck，
Gloria
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A．Only one.B．At least two.C．About three.D．Over five.
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小题3:Who is this text for?
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