Chemistry Experiments
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Chemistry Experiments

Chemists make a great deal of experimentation as they apply scientific methods of study. The greatest part in a chemist's activities is spent in experimentation

THEORY:

Chemists (scientists) make a great deal of experimentation as they apply scientific methods of study.  The greatest part in a chemist's activities is spent in experimentation.  As a beginning chemist, you will have to perform experiments that will enable you to solve problems you will encounter in the study of chemistry.

In this simple experiment it will help you in further understanding the properties of carbon dioxide.  Carbon dioxide is one of the important gas.  Even though it composes only 0.03 percent of the earth's atmosphere.  As plants utilize oxygen, it give off carbon dioxide.  This exhalation of carbon dioxide contributes to part of the carbon dioxide in the atmosphere.  The other source of carbon dioxide in the air is derived from the combustion of fuels like coal, gas, and petroleum.

In the case of the floating moth balls, you will observe that as you drop the moth balls into the water, they quickly sink to the bottom of the container.  After fifteen to thirty minutes, the balls will be covered with bubbles of carbon dioxide released by the reaction of vinegar and baking soda.  The buoyancy of these bubbles will cause the moth balls to rise slowly to the surface of the bottle.  As they come in contact with air, the bubbles will burst and the moth balls will again sink to the bottom.  This illustrates that carbon dioxide is lighter than water because as more carbon dioxide is produced, bubbles will again coat the mothballs, causing these to rise.

OBJECTIVES:

a)  To know what are needed for burning to takes place

b)  To know the products of burning

c)  To know the gas that makes up the air and understanding the properties of carbon dioxide

APPARATUS/MATERIAL:

Candle, match box, Erlenmeyer flask, 3-4 moth balls, vinegar, baking soda, drinking glass, and hard-boil egg.

ILLUSTRATION:

                             

PROCEDURE:

  1. Quickly blow out the candle flame and quickly re-lighted the candle at the bottom of smoke once cm from the wick.  Record your observation.
  2. Move horizontally held piece of cardboard quickly down over the flame of a burning candle.  Take note, do not burn the cardboard.  Record your observation.
  3. a)  Invert an Erlenmeyer flask over a lighter candle.  Take note the time the flask completely covered the candle and the time the candle flame is put off.   b)  Re-light the candle, invert a smaller flask over the lighted candle.  Take note again the candle flame is extinguished.
  4. Fill the tall bottle with cold water.  Add one (1) teaspoonful of vinegar, then add one teaspoonful of baking soda,  Stir well.  Quickly drop the moth balls.  Record your observations after a few minutes.
  5. Place a sheet of crumpled paper inside an empty glass.  Let it rest at the bottom.  Put the glass mouth down into the jar of water.  Push the glass slowly into the water until it reaches the bottom of the jar.  Get the paper from the glass.  Is the water wet or dry? 
  6. Use a hard-boiled egg with its shell removed.  Light a cotton or piece of paper and drop it into a wide-neck milk bottle or flask.  Place the egg (sharp end down on the mouth of the bottle or flask.  Observe what happened.

OBSERVATIONS:

1)

2)

3)

4)

5)

6)

FOR DISCUSSIONS:

1.  What are the requirements for burning to take place?

2.  What are the products of burning?

3.  What are the gases that makes up the air?

4.  In procedure 5, is the paper wet or dry?  What is the reason behind?

Resource:

     College Chemistry I, Laboratory Manual

     Prepared by:

               Jessie R. Agudo, BSCivil Engg', M.A. Mathematics

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Comments (1)

can i ask the posible hypothesis po mam?

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