Created by Ms. Fatima-UCF Intern 4.10 Density Created by Ms. Fatima-UCF Intern

4.10 Density 1. 2.

Density Facts

Density Facts

4.10 Laboratory Investigation: Density Directions: Fill out the data tables and answer all questions below. Part I: Calculating Density How is the density of a substance calculated?   2. If the shape of an object is irregular, like a stone, how can you measure its volume?  3. If the volume of a cube of wood is15.625 cm3 and its mass is 10.00 grams, show the calculation for the density of the wood.

4.10 Laboratory Investigation: Density 4. Based on the density of the wood that you calculated above, would the wood float or sink if it is placed in a bowl of water?  Explain your answer. Remember that the density of liquid water is 1.00 g/cm3. 5. A marble or small sphere, made of stone, is found to have a mass of 3.05 grams. To find its volume, it is placed in a graduated cylinder that originally contains 10.00 mL of water. When the marble is placed in the graduated cylinder, the new volume of the water and marble together is 11.20 mL.  a. Calculate the volume of the marble (Be sure to include units).   b. Calculate the density of the marble (Be sure to include units).

Helpful Hints for Lab Higher the density, the object is lower in the container. Lower the density, the object is higher in the container. Here is a piece wood and a stone in a container of water. The stone has a lower density compared to the stone.

Choose Four Liquids and Predict Pick four from list below: Fresh water, Salt water, Vegetable oil, Rubbing alcohol, Dish soap, Honey, Corn syrup, Milk, Maple syrup HINT! Imagine slowly pouring the four liquids you picked into a container. Once they settled which one would be on the bottom? What would the order be? Prediction: Rank the four liquids from lowest density (top) to highest density (bottom)

Calculate the Density of Four Liquids You Picked Mass (g) Volume (ml) Density (g/ml) D=M/V 1. Fresh water 23.8 g 24 ml 2. Salt water 75 g 800 ml 3. Vegetable oil 150 g 50 ml 4. Rubbing alcohol .02g 10 ml 5. Dish soap 300 g 500 ml 6. Honey 454 g 480 ml 7. Corn syrup 69 g 8. Milk 25 g 130 ml 9. Maple syrup 481.82 g 360 ml

What is the Order of the Four Liquids Based on densities you calculated, what should the order be. Fill in the chart below. Rank the four liquids from lowest density (top) to highest density (bottom)

Objects (Decide where each object would settle) Add in Objects Object Object Density 1. Ping pong ball 0.077 g/cm³ 2. Small bolt 7.7 g/cm³ 3. Popcorn kernel 1.3 g/cm³ 4. Peanut 0.64 g/cm³ 5. Blueberry 0.69 g/cm³ 6. Grape 1.11 g/cm³ 7. Cherry tomato 2.3 g/cm³ Directions: If you added 4 objects to your container of liquids where would they settle? Use the objects from the list on the right. Rank the four liquids from lowest density (top) to highest density (bottom) Objects (Decide where each object would settle)

Observations and Conclusions 6a. Define density. 6b. Describe how this activity helps you compare the density of four different liquids without making mass measurements.

Observations and Conclusions 7a. How did the observations compare to your predictions? 7b. Did any of the results surprise you?

Observations and Conclusions 8a. How would the density of water change if you measured out ½ cup instead of ¼ cup? 8b. Explain your answer.

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