Water's density
![water water](https://ogre.natalie.mu/media/news/music/2024/0220/20231210-1.jpg)
Now you know that temperature can affect the density of water. Hold the pipet near the surface of the water and keep trying until you get it!)Ĭonclusions: Was your prediction right? What happened to the colored water? Did it stay in layers? Which layer was on the bottom? On the top? What does this tell you about the density of hot water compared to cold water? What would happen if you left the cylinder out until the cold water warmed up and the hot water cooled off? Do more experimentation to find out! Experiment 4: Salty or Sweet (This part may take a little practice-if you add the red water too fast you will force the colors to mix. Using a pipet, slowly add red water a drop at a time and watch what happens. Pour some of the blue water into the 10 ml graduated cylinder or narrow glass. Take the blue beaker out of the fridge and the red beaker out of the microwave. Put the red beaker in the microwave for a minute.ģ. Add a handful of ice to the blue water and put it in the refrigerator for a few minutes. Put several drops of blue food coloring in one beaker, and several drops of red in the second.Ģ. Fill two beakers with 150 ml (2/3 cup) of water. Question & hypothesis: Does temperature change the density of water? Write down what you think will happen when you mix cold water and hot water. You’ve found out how the density of water compares to the density of oil and corn syrup now see if you can change the density of water itself! 10 ml graduated cylinder (or a tall, narrow glass).(Your answer will be more exact if you use a graduated cylinder instead of a beaker to measure the volume and weigh the liquid.) The answer is density in grams per milliliter.
![water water](https://s3-us-west-2.amazonaws.com/courses-images-archive-read-only/wp-content/uploads/sites/887/2015/04/23213311/CNX_Chem_00_EE_Density_img1.jpg)
Weigh each liquid in grams (make sure you subtract the weight of the beaker!) and then divide that number by the volume (number of milliliters) of the liquid. On Earth we measure mass (how much of a substance there is) by calculating weight (how heavy it is). If you want to find out the approximate density of each, you can calculate it using this formula: Density = Mass/Volume. Now you know how the densities of the three liquids compare to each other. The next dense will float on top of that, and the least dense will float at the very top. What happened? Did the three liquids mix together or separate into layers? Which liquid is at the bottom of the jar? Which is at the top?Ĭonclusions: Was your prediction right? If so, the liquid you thought was densest should be at the bottom of the jar. Carefully pour each of the liquids into a 600 ml beaker or a large jar. (This is not necessary if you are using dark corn syrup.)Ģ. Place a few drops of food coloring into the beaker of water so you will be able to tell it apart from the other liquids. Question & hypothesis: Which is the most dense: water, corn syrup, or vegetable oil? Which is the least dense? Based on your results from experiment #1, predict which liquid you think is the most dense and which you think is the least dense. If one of your objects floated in the corn syrup but sank in the water, what does that tell you about the densities of water and corn syrup? Take the experiment a step further to find out more.
![water water](https://littlebinsforlittlehands.com/wp-content/uploads/2015/01/Sugar-Water-Density-Rainbow-Science-Experiment-680x1020.jpg)
The denser a liquid is, the easier it is for an object to float on it. Record what happens in each beaker.Ĭonclusions: Were your predictions right? Did the raisins and other objects sink and float when you expected them to? Did they float in one liquid and sink in another? Why do you think they acted the way they did?
![water water](https://www.engineeringtoolbox.com/docs/documents/595/Water_density_temp_pressure_F.jpg)
Take the raisins out of the beakers and try a different object, such as a paperclip or cork. Does it sink or float? Write down what happens to the raisin in each beaker.ģ. (If you are using glass jars, use 2/3 cup of liquid, which is approximately 150 ml.)Ģ. Pour 150 ml of water into beaker #1, 150 ml of corn syrup into beaker #2, and 150 ml of vegetable oil into beaker #3. Question & hypothesis : Will a raisin, paperclip, penny, small cork, ball of paper, and other small objects sink or float if they are placed in water, corn syrup and vegetable oil? Write down what you think will happen when you place each object into the three different liquids.