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.

c. heat could easily travel through the molecules in the air and escape/enter the flask. removing the air slows down the heat transfer.