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PHYSICAL PROPERTIES OF MATTER(2)

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									                                                                      Name: ________________
                                                                      Date: _________________
                                                                      Period: ___

                    CHEMICAL AND PHYSICAL PROPERTIES OF MATTER

     Background Information:

            Properties are the characteristics of a substance. We use properties to identify
     and describe matter. Just like no two people have the same set of characteristics,
     neither do any two substances have the same set of properties.

                      There are 2 different types of properties:

                            1.                        2.


     PHYSICAL PROPERTIES:

           A physical property is used to identify materials and can be observed by using
     your senses.

     Some examples of physical properties are:



CHEMICAL PROPERTIES:
       A chemical property is a characteristic that determines how a substance reacts
with other substances. Chemical properties describe how a substance changes into other
new substances.

Some examples of chemical properties:




Objective: To describe some chemical properties of zinc and copper by seeing how they react
with hydrochloric acid.

Procedure: USING CHEMICAL PROPERTIES TO DESCRIBE MATTER

1. Observe the zinc and copper. List 2 physical properties for each in the data table.
2. Place 2 test tubes in the test tube rack.
3. Place 3 ml of hydrochloric acid (HCl) into each test tube.
4. Add a piece of mossy zinc to one test tube and a piece of copper to the other. Make sure
   to stop up the test tubes with a rubber stopper.
5. Observe what’s happening inside the test tubes and also feel the outside of the test tubes.
6. After 5 minutes, light a wooden splint and bring the flame carefully into the mouth of each
   test tube (but do not touch the liquid). Record your observations in the data table.
7. Dispose of all chemicals in the waste container shown to you by your teacher.

OBSERVATIONS:

Data Table 1:

         ELEMENT                            PHYSICAL PROPERTIES
           Zinc

          Copper


Data Table 2:

         ELEMENT              REACTION WITH HCl              REACTION WITH
                                                             BURNING SPLINT
Mossy zinc

Copper


Conclusions:
1. Here is a description of Mario’s pencil. Circle or highlight the physical properties of the
   pencil.

“My pencil is painted red and is 10.5 cm long. It is made of four materials. One is wood. By
itself, wood floats. My pencil can float too. When I chew on my pencil, it leaves marks in the
wood. Wood is soft enough to grind away in the pencil sharpener. Enclosed in the wood is a
rod made of graphite. Graphite is soft. It can easily mark a piece of paper. The eraser is
held in lace with a small piece of metal. Metal is used because it can be easily bent. My eraser
is pink and is now only 0.25 cm long. When rubbed on paper, it leaves part of itself behind. But
it does remove the pencil mark. That is my pencil, and if anyone sees one like it, please return
it. Pencils have the property of being able to disappear!”

2. Your friend Marsha has the hardest time remembering the names of things, even common
   household items. Fortunately she can usually describe them very well. What common
   example of matter is she describing in A – C below?

   A. “Pass me that stuff that forms tiny colorless cubes and flows pretty well unless it’s
      wet, in which case it sticks together. Oh yes – it also has a strong taste. The oceans
      are loaded with stuff.”
      What is she describing? ____________ __
   B. “Oh no – I’ve spilled some of that stuff that’s wet and clear; it has hardly any taste, and
      when it’s really cold it becomes solid; sometimes it falls from the sky.”
      What is she describing? ______________

   C. “Look, up in the – oh, what’s that stuff called – it’s transparent and you hardly know it’s
      there, it doesn’t have any taste or smell by itself; when you run or ride your bike you
      can feel it; you can actually float through it if you have the right equipment.”
      What is she describing? _______________

   D. Chose an object at home, outside, or in the classroom. Describe it the best you can by
      its physical properties just like Marsha did. Make sure not to use its name in the
      description. Later, we’ll see if your classmates can figure out what your object is.
      Write the description below.




3. What evidence is there that a chemical reaction took place between the hydrochloric acid
   and the mossy zinc?



4. What happened to the burning splint when it was placed in the test tube containing the zinc
   and acid?



5. What happened to the burning splint when it was placed in the test tube containing the
   copper and acid?

6. How do zinc and copper differ in their reaction to hydrochloric acid?



7. Do both elements have the same chemical properties? Explain why or why not.



   What is a chemical property of zinc? ________________________

   What is a chemical property of copper? _______________________

8. When the zinc and hydrochloric acid were mixed, hydrogen gas was produced. The popping
   sound you heard when the splint was put into the test tube was because the hydrogen gas
   was burning. The term given for the ability to burn is called _______________

9. What chemical property makes substances like gasoline, natural gas, and diesel fuel so
   useful? __________________

								
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