lab 5

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San Jacinto Community College *

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1305

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Chemistry

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Dec 6, 2023

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Density: A Characteristic Property 1. In Experiment 1 , you took measurements for three volumes of water. Use the data you collected during the experiment to record the quantities in the table below. Remember to pay attention to significant figures and record all masses and volumes with all the decimals provided by the lab. 2. In Experiment 1 , you took measurements for three volumes of ethanol. Use the data you collected during the experiment to record the quantities in the table below. Remember to pay attention to significant figures and record all masses and volumes with all the decimals provided by the lab. 3. In Experiment 1 , you took measurements for three volumes of water. Use the data you collected during the experiment to calculate the quantities in the table below. In this experiment, the volume is your least precise measurement, containing fewer significant figures than the mass. Therefore, the density can only be as precise as the volume. Mass of graduated cylinder (g) 32.0g 32.0g 32.0g Volume of water (mL) 10.0ml 20.0ml 30.0ml Mass of graduated cylinder plus water (g) 42.0g 52.0g 62.0g Mass of graduated cylinder (g) 32g 32g 32g Volume of ethanol (mL) 10ml 20ml 30ml Mass of graduated cylinder plus ethanol (g) 39.890 47.780 55.670 Total mass of water (g) 42g 52g 62g Density of water (g/mL) 4.2 5.2 6.2 Average density of water (g/mL) 5.2

4. In Experiment 1 , you took measurements for three volumes of ethanol. Use the data you collected during the experiment to calculate the quantities in the table below. Please note that in this experiment the volume is your least precise measurement containing fewer significant figures than the mass. Therefore, the density can only be as precise as the volume. 5. In Experiment 2, you took measurements for three volumes of an unknown liquid. Use the data you collected during the experiment to record the quantities in the table below. Remember to pay attention to significant figures and record all masses and volumes with all the decimals provided by the lab. 6. In Experiment 2 , you took measurements for three volumes of unknown liquid. Use the data you collected during the experiment to Total mass of ethanol (g) 39.890g 47.780g 55.670g Density of ethanol (g/mL) 3.989 4.778 5.567 Average density of ethanol (g/mL) 4.778 Mass of graduated cylinder (g) 32g 32g 32g Volume of unknown liquid (mL) 10ml 20ml 30ml Mass of graduated cylinder plus unknown liquid (g) 431.100g 87.200g 65.300 g

calculate the quantities in the table below. Please note that in this experiment the volume is your least precise measurement containing fewer significant figures than the mass. Therefore, the density can only be as precise as the volume. Total mass of unknown liquid (g) 431.100g 84.200g 65.300g Density of unknown liquid (g/mL) 43.11 8.42 6.53 Average density of unknown liquid (g/mL) 19.35 Experiment 3 7. What was the initial volume of water and the initial mass of the graduated cylinder with water? 30 ML and 84.0 g 8. For each of the iron measurements, use the data you collected during the experiment to record the quantities in the table below. Remember to pay attention to significant figures and record all masses and volumes with all the decimals provided by the lab. Total volume of water plus iron (mL) 30.64 31.27 31.91 32.54 33.18 Total mass of iron in the cylinder (g) 5.0 10.0 15.0 20.0 25.0 9. For each of the aluminum measurements, use the data you collected during the experiment to record the quantities in the table below. Remember to pay attention to significant figures and record all masses and volumes with all the decimals provided by the lab.

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10. For each of the iron measurements, use the data you collected during the experiment to calculate the quantities in the table below. Remember to pay attention to significant figures and record all masses and volumes with all the decimals provided by the lab. Please note that in this experiment the volume is your least precise measurement containing fewer significant figures than the mass. Therefore, the density can only be as precise as the volume. Net volume of iron (mL) .640 1.27 1.91 2.54 3.18 Density of iron (g/mL) 7.812 7.874 7.853 7.874 7.861 Average density of iron (g/mL) 7.855 11. For each of the aluminum measurements, use the data you collected during the experiment to calculate the quantities in the table below. Remember to pay attention to significant figures and record all masses and volumes with all the decimals provided by the lab. Please note that in this experiment the volume is your least precise measurement containing fewer significant figures than the mass. Therefore, the density can only be as precise as the volume. 12. EXPERIMENT 4: For each of the unknown metal measurements, use the data you collected during the experiment to record the quantities in the table below. Remember to pay attention to significant figures and record all masses and volumes with all the decimals provided by the lab. Total volume of water plus aluminum (mL) 31.85 33.70 35.56 38.41 39.26 Total mass of aluminum in the cylinder (g) 5.0 10.0 15.0 20.0 25.0 Net volume of aluminum (mL) 1.85 3.70 5.56 7.41 9.26 Density of aluminum (g/mL) 2.703 2.703 2.698 2.699 2.700 Average density of aluminum (g/mL) 2.701

Total volume of water plus metal (mL) 31.40 32.10 32.80 33.50 Total mass of metal in the cylinder (g) 10.0 15.0 20.0 25.0 13. EXPERIMENT 4: For each of the unknown metal measurements, use the data you collected during the experiment to calculate the quantities in the table below. Remember to pay attention to significant figures and record all masses and volumes with all the decimals provided by the lab. Please note that in this experiment the volume is your least precise measurement containing fewer significant figures than the mass. Therefore, the density can only be as precise as the volume. Net volume of metal (mL) 1.40 2.10 2.80 3.50 Density of metal (g/mL) 7.143 7.143 7.143 7.143 Average density of metal (g/mL) 7.143 Conclusions 1. Given that the density of glycerol is 1.261 g/mL, how much will 15.0 mL of glycerol weigh? 18.915

2. Given the density values for the metals in the table below, will the same volume of your unknown metal be lighter or heavier than copper? Metal Density (g/cm 3 ) zinc 7.13 tin 7.28 coppe r 8.96 silver 10.49 lead 11.36 3. Why do you think it is important to record your data with all the decimals provided by the instruments even if they are zero? How does this help with data analysis? Go back to reverify work Please turn this into Blackboard. Also, complete the MC (multiple choice) lab quiz in the Hayden McNeil website.

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