Chapter 1 Part I by 76guOsK


									                                  Chapter 1 Part I

1. What is chemistry?
2. a) Name the three common states of matter.
     b) How does a solid differ from a liquid?
     c) How does a liquid differ from a gas?
     d) How is a liquid similar to a gas?
3.   a) Define property
     b) How are properties useful in classifying materials?
4. a) How do physical properties and chemical properties differ?
     b) Give an example of each.
5. Classify the following as chemical or physical properties.
        a) The color of a copper sulfate solution is blue.
        b) The melting point of table salt is 98C.
        c) Iron rusts in areas of high humidity.
        d) The freezing point of water.
        e) The ductility of a metal.
        f) The hardness of a metal.
6. What is the difference between extensive properties and intensive properties and
     give an example for each?
7. Distinguish between a physical change and a chemical change.
8. Identify each of the following as either a physical change or a chemical change.
     Explain your answers.
        a) A piece of wood is sawed in half.
        b) Milk turns sour.
        c) Melted butter solidifies in the refrigerator.
        d) Melting a piece of wax.
        e) Burning a log.
9. List all the physical/chemical properties, and the physical/chemical changes in the
     following statements:

       a) “The temperature of the land is an important factor for the ripening of
           oranges, because it affects the evaporation of water and the humidity of
           the surrounding air.”
       b) “Copper is a red-brown element obtained from copper sulfide ores by
           heating in air, which forms copper oxide. Heating the copper oxide with
           carbon produces impure copper."
10. Contrast mixtures with pure substances.
11. Explain the difference between compounds and mixtures.
12. Classify the following as element, compound, homogeneous mixture, or
   heterogeneous mixture:
       a) Iron
       b) Sugar water
       c) Table salt
       d) Helium
       e) Seawater
       f) Carbon dioxide
       g) Gold
       h) Dirt
13. What physical properties are used for the separation of the components of a
   mixture by:
       a) Filtration
       b) Chromatography
       c) Distillation
14. Explain how you would distinguish sugar from salt. Identify the physical and
   chemical properties used in your explanation.
15. Identify the following as homogeneous or heterogeneous mixtures and suggest a
   technique for separating their components:
       a) Chalk and table salt
       b) Salt water
       c) Gasoline and motor oil
       d) Carbonated water


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