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CONTROLLED EXPERIMENT - RESPONSE FORM

THE LAW OF CONSERVATION OF MASS - SC.8.N.3.2

Student Name: _____________________________________
Date: __________________

TITLE THE LAW OF CONSERVATION OF MASS
PROBLEM What affect does a closed container have on the conservation of mass?

STATEMENT

If a container storing reactants is closed, then the mass of the product will

HYPOTHESIS (increase/decrease/remain the same) in comparison to the reactants.
circle one

CONTROL INDEPENDENT (TEST) VARIABLE DEPENDENT (OUTCOME) VARIABLE NUMBER OF
TRIALS

CONSTANT

VARIABLES

 one – triple beam balance
MATERIALS  one – 600 mL beaker
 one – 3 liter soda bottle with cap
 one – funnel
 one – 250 mL flask
 one – graduated cylinder
 one – tissue
 20 grams – baking soda
 70 mL - vinegar

Step 1: Use a graduated cylinder to measure 35 milliliters of vinegar. Transfer the
vinegar into the beaker.
Step 2: Cut the tissue into two pieces. Place a tablespoon of baking soda into each of
the two pieces of tissue and wrap them neatly.
Step 3: Place one of the wrapped tissues of baking soda and the beaker of vinegar on
the triple beam balance at the same time. Record the measurements.
PROCEDURES
Step 4: Place the packet of baking soda inside of the beaker of vinegar. Allow the reaction to
occur. Calculate the product in the beaker after the reaction has occurred.
Step 5: Use a funnel to pour 35 milliliters of vinegar into a 3 liter bottle.
Step 6: Place the second wrapped tissue of baking soda and the bottle of vinegar on
the triple beam balance at the same time. Record the measurements.
Step 7: Place the second packet of baking soda into the bottle and quickly twist on the cap.
Step 8: Allow the reaction to occur. Calculate the product of the reactants in the
bottle after the reaction has occurred. Record the measurements.

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