Name Period Date. Lab 1: Mass of Ice Materials: beaker, ice and balance.
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1 Name Period Date Testing the Law of Conservation of MASS! Introduction: Does mass change in a chemical or physical reaction? In this series of experiments you will find the answer to this question. Lab 1: Mass of Ice Materials: beaker, ice and balance. 1. Mass the chunk of ice in the beaker. 2. Wait until it melts (conduct the other lab procedures while waiting). 3. Mass the melted ice again. Prediction: Will the mass of the chuck of ice equal the mass of the water it melts into? WRITE your explanation. Lab 2: Mass of Dissolved Salt Materials: salt, graduated cylinder, balance, vial, cup 1. Place a small spoonful of salt in a cup. 2. Add 30 ml of water to the vial. 3. Mass the salt, cup, vial (with water), and lid. 4. Mix the salt into the water and shake 5. Mass the vial, lid, and cup again. Prediction: Will the mass change? WRITE your explanation. Lab 3: Mass of Mixed Solutions Materials: solutions A and B, two beakers 1. Measure 15 ml of A into a beaker. 2. Measure 15 ml of B into a beaker. 3. Mass both solutions. 4. Pour A into B. 5. Mass both beakers and the new solution. Prediction: Will the mass change? WRITE your explanation..
2 Lab 4: Mass of a Gas Materials: gas bottle or plastic bag, 1/8 of an Alka Seltzer tablet, balance and goggles 1. Fill the gas bottle 1/3 full of water (or measure 25 ml of tap water into the bag). 2. Water has a density of 1.00 g/ml. So using the formula, Density = mass volume, 25 ml of water has a mass of 25 g. 3. Mass the bottle (or bag), water, lid and tablet. 4. Add the tablet and quickly put the lid on or zip the bag. 5. Mass again. 6. Allow gas to escape (open), Mass again. Prediction: Will the gas have mass? Lab 5: Sunset Reaction Materials: sodium bicarbonate (baking soda), phenol red indicator, calcium chloride, electronic balance, zip-lock bag, spoon, graduated cylinder, spoon. 1. Place 1 scoop of calcium chloride, CaCl 2, in the bag 2. Place 1 scoop of sodium bicarbonate, NaHCO 3, in the bag. 3. Mass the bag and its contents. Record the value in the data table. 4. Measure 10 ml of phenol red indicator solution into the graduated cylinder. Record the mass of the water in the data table. 5. Tip the bag sideways, and while holding the solids in the bottom corner, pour the liquids in the other corner. Twist the bag if you like so the solids will not get wet from the liquid mixture. 6. Keeping the trapped air to a minimum, reseal the bag. Hold the bag and let the liquid move from one end of the bag to the other until the content are mixed. 7. Observe the reaction until it comes to a complete stop. Record your observations. 8. Record the mass of the unopened bag. 9. Open the bag and release the gas. Record the mass of the bag after the gas is released. Prediction: Will the gas have mass? Once you have finished collecting data, record it on the class data chart.
3 Data Table Do not forget the units!!!! Lab 1: Mass of Ice Mass Write observations here: Mass of reactants (ice and beaker) (water and beaker) Lab 2: Dissolved Salt Mass Write observations here: Mass of reactants (unmixed materials + lid) (water + salt, cup, vial, lid) Lab 3: Mixed Solutions Mass Write observations here: Mass of reactants (beaker A w/solution and beaker B w/solution) (beaker w/a+b and empty beaker) Lab 4: Mass of a Gas Mass Write observations here: Mass of bag and water Mass of tablet Mass of all reactants (mass of bag and water + mass of antacid tablet) Mass of bag and products Mass after gas released Lab 5: Sunset Reaction Mass Write observations here: Mass of bag and dry reactants Mass of liquid Mass of all reactants (mass of bag + mass of water + dry reactants) Mass of bag and products Mass after gas is released
4 Class Data Chart Group Lab 1 Mass of Ice Lab 2 Dissolved Salt for each lab Lab 3: Mixed Solutions Lab 4: Mass of a Gas Lab 5: Sunset Reaction Class Average Analysis: 1. What did you notice about the class average compared with the individual group values? 2. Which experiments were physical changes? 3. Which experiments were chemical changes? 4. Did the mass change in the physical or chemical changes?
5 5. What kind of molecules are in ice? What kinds of molecules are in water? As ice melts, what happens to its molecules? 6. Where do molecules of salt go when they dissolve in water? What happens to their mass? 7. When the two solutions were poured together a new substance forms. What was it made of? 8. Why did the mass change when the bag was opened in experiments 4 and 5? 9. The Law of Conservation of Mass states: Mass is always conserved in a physical or chemical reaction as long as nothing is added or lost. Reword this in a sentence you understand. 10. Do you think our 5 experiments proved this law? Why or why not? Conclusion: Write 2 things you learned in complete sentences
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