Friday, November 28, 2008
Today, we reviewed nomenclature, types of reactions, balancing equations, and predicting products. Students received some practice questions to try over the weekend while studying for the BIG chemistry unit test which is on Monday. Good luck with your studying! Write me questions through the comment function if you need to.
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4 comments:
so when do you put the prefix on?
You use prefixes on the names of chemical compounds ONLY when the compound is a molecular (or covalent) one. You will know it is a molecular compound if it only has NON-METALS in it (there will not be a metal in it). If there is a metal in the formula, then it is an ionic compound and you will never use prefixes on these (for example LiCl is lithium chloride because lithium is a metal, notice there is no "mono" prefix for the chloride). But, dinitrogen pentoxide would be molecular (notice the two prefixes on the element names) because both nitrogen and oxygen are non-metals. Hope this helps, come see me before class on Monday if you still have questions. Happy studying!
can you ask us a tricky question for practise because I've already completed the worksheets
Good for you for finishing the review sheets! Excellent work!
Here's a few tough questions that will help you on tomorrow's unit test:
1. In our lab on neutralization reactions, we used the reactants hydrochloric acid (HCl) and sodium hydroxide (NaOH). Write a word equation and a balanced chemical equation to represent this reaction. (Remember to name the “salt” formed.)
2. Give an example from everyday life where we decrease temperature to change a reaction rate, where we increase temperature to change a reaction rate, where we increase surface area to change a reaction rate, and where we increase concentration to increase reaction rate. Be sure to state if the reaction rate is increased or decreased as a result in each case.
3. Give an example of a combustion reaction. Explain the role played by these reactions in global warming.
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