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Experiment 4 - Experiment4:PropertiesofGases...

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Experiment 4:  Properties of Gases   Remember to wear goggles at all times.  Please ensure the  safety of those around you.   Objectives:  To investigate some physical and chemical  properties of gases and use these properties to identify  these gases when they are encountered.   Read  pp 46-50 in laboratory manual.   Materials provided by students:   % Matches % Toothpicks % Pie tin % Drinking straw % Marker pen % Household white vinegar % 3% Hydrogen peroxide (H 2 O 2 ) % Measuring spoons % Baking soda        
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                From ChemKit: Goggles (Should be on at all times.) 24-well plate 2 test tubes   Clockwise from top: 24-well plate, 6M hydrochloric acid HCl from auxillary bag and long stemmed pipet with HCl label, stopper with copper & gas delivery tube, clean and empty pipet, stopper with plastic delivery tube and 2 test tubes.   Wide neck pipet bulb used to trap the gas.       From Experiment Bag: 3 Wide-neck pipet bulbs (see above) Alka Seltzer Mossy Zn pieces Manganese (Mn) pieces
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Bromthymol blue Limewater (saturated calcium hydroxide) Mossy Zn piece.   We will identify some gases by their chemical and  physical properties.  We will look at hydrogen (H 2 ),  oxygen (O 2 ), and carbon dioxide (CO 2 ).   Refer to your lab manual page 47 for the chemical  equations of the reactions we are about to  perform.   Procedure:  Take the 6M HCl (hydrochloric acid)  from the auxiliary bottle. Pour 3.5 mL of distilled water into the graduated  cylinder.  Carefully add, drop by drop, 1 mL of 6mL  directly from the auxiliary bottle.  Mix well and pour  the total 4.5 mL of diluted HCl into a test tube.   Use your well as a test tube and pipet holder.     Graduated cylinder with 3.5 mL of distilled water then 1.0 mL of HCl added dropwise from the auxiliary bag.  Mix by stirring. Make sure goggles are on.        
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Test tube with the solution of HCl prepared above. Insert stopper with plastic delivery tube.  Notice that I hold the test tube along the end to insert in order to avoid breaking the glass.   The test tube can be inserted in a hole of the 24-well plate  for support.
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