Chemical reactions lab procedures: 1. place a 1cm long piece of white chalk in a clear plastic cup. 2. add 5 ml of vinegar to the cup. 3. record your observations. if you were performing the procedures above you would need to a. use a microscope to observe the reaction. b. wear safety goggles during the procedure. c. dilute the vinegar with water before using it. d. waft the fumes that are produced toward your nose.

B. Wear safety goggles during the procedure.

Schools require you to wear safety goggles in the laboratory because

1.Safety goggles prevent eye injury when you or your neighbour spatter chemicals, break glass, or cause an explosion.

2.They do not want to pay the vast damages from the lawsuits that come from such injuries.

Using a microscope to observe the reaction is incorrect because you can see the results (bubbles of gas) with your naked eye.

Diluting the vinegar with water before you use it is incorrect because the vinegar is already a dilute solution.

Carefully wafting the fumes produced toward your nose is OK, but you don’t need to do it.

explanation:

two years ago, when picking flowers in the mountains back of yosemite valley, i found a book. it was blotted and storm-beaten; all of its outer pages were mealy and crumbly. the paper seemed to dissolve like the snow beneath which it had been buried, however; many of the inner pages were well preserved. and although all were more or less stained and torn, whole chapters were easily readable. this is the condition of the great open book of yosemite glaciers today; its granite pages have been torn and blurred by the same storms that wasted the castaway book.

two years ago, when picking flowers in the mountains back of yosemite valley; i found a book. it was blotted and storm-beaten, all of its outer pages were mealy and crumbly. the paper seemed to dissolve like the snow beneath which it had been buried, however, many of the inner pages were well preserved. and although all were more or less stained and torn; whole chapters were easily readable. this is the condition of the great open book of yosemite glaciers today, its granite pages have been torn and blurred by the same storms that wasted the castaway book.