Here is your first worksheet for the vacation(which all of you have to complete)! It is a tutorial cum worksheet on chemical equations, borrowed from the website of David Katz, an eminent Chemistry educator, who has been kind enough to share so many of the resources he has compiled himself, on his website http://chymist.com .
http://chymist.com/Equations.pdf
The worksheet begins with a review of what information chemical equations convey, the reasoning behind balancing chemical equations etc. This is followed by many problems on balancing equations.
Then it covers different kinds of chemical reactions- direct combination, decomposition etc. It then gives a set of problems in which you are asked to predict and complete chemical equations, by identifying the type of reaction that could occur between the given reactants.
You can never be absolutely sure about a prediction regarding a reaction unless you actually carry it out in the lab. But it is valuable from the point of view of exams, to develop the skill to be able to relate a set of reactants which you have not encountered, with reactions that you are familiar with and make intelligent guesses as to what reaction might occur. So please attempt to complete all the reactions given at the end of the worksheet. It’s alright if you get it wrong. We could even try out some of those reactions in the lab when you come to school in June, and verify the predictions.
Kishore Athrasseri
Class 9 Chemistry 
but where are we supposed to do the worksheet ?
You could write the answers in A4 sheets and bring them with you when you come back to school. If you wish, you could also take a printout of the worksheet and fill in the answers in the space provided. Either way, please do go through all the text which will help you revise, and not just solve the questions.
but sir where r the worksheets.
Just click on the link to the file, shown in green text.
DO we have to read all of this
Yes, you have to read the whole worksheet and attempt all the questions. If you think it is a lot of work, do it slowly- one section at a time with a few days’ break in between. There’s no hurry! You just have to complete it by the time school reopens. 🙂
🙂
are you going to give us only 2 worksheets???
are we going to get only 2 worksheets??
Since this worksheet covers several important topics, you are not going to get a lot of other work. Perhaps one more worksheet, later in the vacation.
does the first lot of sheets have 2 worksheets,am i to do it on the computer or take a printout
Yes, there are two sets of questions in the worksheet- one on balancing equations and the other on completing and predicting equations.
You can’t solve the worksheet on the computer- it’s just a pdf file. Either take a printout or just write the answers on A4 sheets.
can v take help from somebody if we find it difficult to aswer some of d questions in the worksheet???
worksheet done sir
Finished already?!
You can take help if you do have someone on hand who can help. It’s also okay if you are not able to answer a few questions here and there.
worksheet finished!!!!!!!!!!!!!!!!!!
sir have you posted the other worksheet
Hi Unmesha!
After much consideration, I have decided against giving another worksheet. So there is only one worksheet to be completed.
Thnx!!
in the tutorial, page 12, (effect of heat on carbonates) it says that all carbonates except for alkali metal carbonates loose only CO2 when heated and form the metal oxide, whereas in the text book, page 32 it says that Hg and Ag carbonates decompose to give metal + O2+ CO2, ……which one should we folllow?
Usually the metal carbonates decompose into metal oxide and carbon dioxide. I guess the same thing happens with mercury and silver carbonates also. But because the oxides of mercury and silver are unstable and decompose easily to give oxygen on heating, unlike most other metal oxides, probably the worksheet puts it that way.
For the time being just take it as mercury/silver carbonate decomposing into mercury/silver oxide + carbon dioxide
i have a doubt…..sir,theres a question which says Ag + H2SO4—>??
:/…
its a displacement reaction….but Ag is not an active metal so my guess was it should be N.R….
i got confused and checked it online and the answers said that Ag2SO4 + H2….
You are right, silver not being an active metal, will not react with sulphuric acid.
thankyou sir…