Investigate the relationship between the mass and the volume of an object 1. Observe A larger amount of water occupies a larger volume. Is there a relationship between the amount of a substance and its mass? Are the mass and the volume of the same substance related? 2. Search for information T here is a relationship between the mass and the volume of an object. It is called density. 3. Make a hypothesis "The mass of an object is directly proportional to its volume." 4. Experiment 1. Use three graduated cylinders of different sizes: 10 mL, 100 mL and 250 mL. 2. Place the empty 10 mL cylinder on the scales. Press the tare button. 3. Pour some water into it. Note the volume. Measure its mass with the scales. Write it down. 4. Repeat the procedure with the other two cylinders and use different amounts of water. 5. Analyse the data Complete this table in your notebook with your results. Cylinder 1 (10 mL) Cylinder 2 (100 mL) Cylinder 3 (250 mL) Mass (g) … … … Volume (mL) … … … · As you use larger amounts of water, what happens to its mass? And its volume? · For each cylinder, divide the mass by the volume. Comment on the results. Draw a mass-volume graph of the data. · What shape is the graph? Does it pass through the point (0, 0)? What does this mean? · Write down the mathematical relationship between the two quantities. · What would be the volume of 45 g of water? · What would be the mass of 243 mL of water? 6. Publish the results · What is the law that can be concluded from the results of the experiment? Write it as a statement and as a mathematical formula. · Write a scientific report for this experiment. You can create it in Word format or as a presentation. Include all of the sections of the scientific method. 6.2. The scientific method: a case study 27 Would this hypothesis be true for gases? Under what conditions? 6. Laboratory work Conclusions 28
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