题干

某校兴趣小组同学准备进行常见酸、碱、盐的性质实验时,发现实验台上摆放的药品中(如图),有一装溶液的试剂瓶未盖瓶盖且标签破损,于是决定对这瓶溶液进行实验探究:

【提出问题】这瓶溶液是什么溶液?

【获得信息】酸、碱、盐的性质实验中用到含有钠元素的物质是氯化钠、氢氧化钠、碳酸钠

【提出猜想】这瓶溶液是:猜想一:氯化钠溶液;猜想二:氢氧化钠溶液;

猜想三:碳酸钠溶液.

【实验推断】

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    If you are interested to find a part time job or learn something different during your spare time, you can have a look at the following jobs offered by the DC Public Library.

Teens of Distinction Program

    The DC Public Library offers part time jobs for teens through the Teens of Distinction Program. Teens work 10-12 hours per week all year long, helping the library with important tasks and projects. The Teens of Distinction Program is now hiring! To apply, you have to:

● be a DC resident

● have and maintain at least a 2.5 grade point average

● be 16 to 18 years old

● be able to work 10-12 hours per week

● be able to work for DCPL for at least 9 months

Oh, and of course you have to impress us with your wonderful personality!

Teen Volunteer Opportunities

    If you want to earn community service hours for school, Youth202 is a good choice.

    Youth202 is a radio program created by youth and for youth. You can learn radio production skills, interview people around you, and help keep other teens to learn news, events, and anything else you think is important.

Summer Youth Employment Program (SYEP)

    Every summer, teens can work here to help library customers organize books and learn lots of new skills, such as program planning, writing and media production.

    On Friday, January 25 at 12:15 pm, the application for the 2014 SYEP will be open to teens between the ages of 14 and 21.

    Applications will be processed on a first come, first served basis. Space is limited this year, so teens are encouraged to apply early, and remember not to miss the deadline, Saturday, February 16.