Chapter 2 Study Questions


1.  Define the following:

      a)  element              b)  compound               c)  pure substance


2.  Classify each of the following as a pure substance or a mixture.  For each pure substance, indicate whether it is an element or a compound.  Which of the mixtures are solutions?

      a)  air                     b)  titanium                   c)  oak                         d)  baking soda

      e)  oxygen              f)  7-Up                        g)  wine                        h)  carbon monoxide


3.  Label each of the following drawings as element, compound, or mixture:  (Assume each type of circle represents a different type of atom.)

                        a)                                 b)                                 c)                                 d)







          ____________               ____________              ____________             ____________


            Which of the boxes above contain molecules?


4.  List four physical states of matter.  For each physical state, indicate whether the particles are in motion and whether they are close or far apart.


5.  List one chemical and one physical property of the element chlorine.  (You may use your textbook.)


6.  Describe three observations that frequently accompany chemical reactions and explain why they might indicate that a chemical reaction is occuring.


7.  Classify each of the following processes as physical or chemical changes.

      a)  combustion of natural gas

      b)  evaporation of alcohol

      c)  condensation of water vapor

      d)  photosynthesis

      e)  splitting of carbon dioxide into carbon and oxygen

      f)  formation of sodium chloride (NaCl) from it elements

      g)  distillation of a sodium chloride solution to collect pure water


8.   Record one a) qualitative and one b) quantitative observation about this page.  State a theory about this page.


9.  Give the name of the following types of containers:


      a)                                       b)                                 c)                                 d)








Summary of Chapter 2:  Matter and Energy



physical states:  solid, liquid, gas

physical & chemical properties

physical & chemical changes





pure substances

homogenous and heterogenous mixtures


separation of mixtures:  distillation, filtration, chromatography