Density Lab @ Home Procedure, Data, CER PDF

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Density Experiment: Hot and Cold-Water Experiment.
The Question I Investigated Was: How does temperature affect the density of a liquid?...

Description

Density Experiment:

Hot and Cold-Water Density Experiment. Experimental question: The Question I Investigated Was: How does temperature affect the density of a liquid? Controlled variable: Amount of water and type of glass Independent: Temperature Dependent: Density

Hypothesis: If the temperature of the liquid increases, then the density decreases because hot water has less density which means hot water takes up more space as the temperature increases. On the other hand, when the temperature of the liquid decreases, therefore the density increases because cold water is much denser and will sink in room-temperature water.

Procedure: type your procedure here: Materials: Hot water Cold water 2 identical clear glass cups Food colorings (blue, orange) Water-resistant index card Lab procedure: 1.Completely fill the drinking glass cup with hot tap water and add drops of orange food coloring. On the other hand, fill another glass cup with very cold water and add drops of blue food coloring. 2.Stir the water in both glass cups so that the coloring is well-mixed in both. 3. Place the water-resistant card on the top cold-water glass. 4. Hold a water-resistant card over the top of the hot water glass. While holding the card against the glass opening, carefully turn the hot glass cup upside down and place it on the top of the cold glass. 5. With the card still in place, position the hot glass of water directly over the glass of cold water so that the tops line up exactly. Slowly and carefully remove the card so that the hot water jar sits directly on top of the cold-water jar. 6. After that use the same procedure as above but place the glass cup of cold water, upside down over the glass cup of hot water.

Data: share your data here (copy a picture into this space if you wish): Cold Water into the top of Hot Water. After placing the cold water on top of the hot water, I conclude that the cold blue water will immediately sink, and some hot orange water will also rise into the cold water. Therefore their temperature and color will be mixed into each other. Hot Water into the top of Cold Water. Also after placing the hot orange water on top of the cold blue water, I conclude that the hot orange water will float and remain at the top of the glass cup and the cold blue water will remain at the bottom of the glass cup.

CER: Write a CER about your experiment here. See Cat CER for sentence frames.

Overall, my experiment showed that density will decrease if the liquid has a high temperature but density will increase if it has a low temperature. My evidence for this claim is that when you place the hot water over the cold water, the hot water will float and the cold water will remain at the bottom, but when you place the cold water into the top of hot water, they will be mixed up. The evidence strongly supports my position because when liquids are heated, the liquids will also expand therefore If there is less mass in the volume, the hot water is less dense and floats on the cold water. Also, on the other hand, when there is cold water, the particles are occupying a smaller volume therefore it will become denser, and it causes the cold water to sink in the hot water and they will immediately be mixed up.

Extension: If you were to extend your experiment or plan a follow up experiment, what would you do? For further study and to understand more about how temperature affects the density, it is a great option to do another experiment which is adding the cold

and hot water to room-temperature water. Because of this, we can learn more about the density difference between hot and cold water when we put it on room-temperature water so we are able to relate how density in temperature impacted on the real-life basis....