Water, Ph, And Buffers

Hypothesis: If 3 drops of soap fit on the penny and 9 drops of water fit on the penny, then the cohesion is water molecules are attracted to other water molecules. Surface tension is the name we give to the cohesion of water molecules at the surface of a body of water. Independent Variable: This is the one you're changing in the experiment, so it's the type of solution that you're dropping on the penny.

When an object falls onto the surface, it has to push the water molecules apart. If the effect of the weight of the object is insufficient to match the attractive forces between molecules in the surface layer, the object will not enter the surface.

The measuring cylinder was then used to accurately measure out 20 mL of water, which was then poured into the test tube that would be used for the experiment. The test tube was then placed into the clamp, which was then adjusted in order to make sure that the test tube was grasped firmly and would not fall out.

7. Draw a diagram of this set up. Use arrows to depict the movement of each substance in the

In this experiment, we are trying to figure out how many droplets of water a penny can hold while face up. Before we began the experiment, we already knew that water molecules stick together as long as gravity isn't stronger than the water. In the experiment we had water, soapy water, and rubbing alcohol.

Next, one of the 5 mL syringes was used to collect 1.5 mL of tap water. Before filling, the cap was removed from all the syringes. The water was checked for air bubbles. Throughout the experiment, if the fluid in the syringe had air bubbles it was emptied and filled until air bubbles were no longer present. The 1.5 mL of tap water was emptied into well #2. The same syringe was then filled with 2.0 mL of tap water. This water was then placed in well #3. Well #1 was left without H2O. The syringe was finally placed in the H2O beaker in order to keep the syringes

E. What would happen if you dropped the object into the beaker while using the Archimedes’ Principle method instead of submerging the object?

Abstract: This experiment introduced the student to lab techniques and measurements. It started with measuring length. An example of this would be the length of a nickel, which is 2cm. The next part of the experiment was measuring temperature. I found that water boils around 95ºC at 6600ft. Ice also has a significant effect on the temperature of water from the tap. Ice dropped the temperature about 15ºC. Volumetric measurements were the basis of the 3rd part of the experiment. It was displayed during this experiment that a pipet holds about 4mL and that there are approximately 27 drops/mL from a short stem pipet. Part 4 introduced the student to measuring

The purpose of this experiment was to see if a penny could hold more drops of salt water or tap water. It was found that a penny could hold an average of 22.3 drops of tap water and only 20.8 drops of salt water. These results are consistent with the hypothesis: If the salt concentration of water impacts the amount of water a penny holds, then the penny will hold less drops with salt water. While dropping the water onto the penny, it was observed that the water formed into a dome-like shape on the penny. It looked like the individual drops of water turned into one large drop of water. This was observed for both the tap and salt water. This happened due to the cohesion and surface tension of water. Cohesion simply means that water molecules are attracted to each other and want to cling together. Surface tension is the special term that is applied to the cohesion of water molecules.

The volume of a small test tube and a thin-stemmed pipet were determined in this section of the lab. Water was poured into a small test tube until the water reached the very top edge of the test tube. The test tube was then emptied into a plastic 25 mL graduated cylinder and volume was measured and recorded into data table 3. A think-stemmed pipet was completely filled with water. Drops were carefully counted and emptied into the empty plastic 25 mL graduated cylinder until the water level reached 1 mL. The number of drops in 1 mL was recorded into data table 3. The thin-stemmed pipet had a total volume of 4 mL and that was also recorded into data table 3.

Third, we could try to keep the temperature of the water the same throughout the whole experiment, when we put 100°C water into a beaker, the temperature would quickly drop down maybe 10°C in a minute or so. So if we had a machine that would keep a consistent temperature the whole time, we could get a

Have you ever wondered why your cereal clusters together after milk is poured or why it sticks to the side of your bowl? Even if you try to pull them apart, they come together again. This is a spectacle that happens every day but we just don’t really notice it. Most people don’t really realize that it’s happening everyday. Using fluid mechanics, we can determine why floating objects come together due to surface tension, viscosity and buoyancy (Grayson, 2014).

Abstract: During this lab, the pH of water in soil from a man made garden, a deciduous forest, and a river bank were tested after leaving it in containers for one, two, and three hours, coming out to a total of three trials with three different soils all together. After testing the pH of the water when being added to the soil for the desired amount of time and comparing it to the original water with no soil added, is then when each pH difference was observed and recorded in a a notebook, while pictures were taken of the experiment being conducted.

3) In this experiment, only the forces on the plane surface were considered. Do the hydrostatic forces on the curved surface of the quarter-circle block affect the measurement? State why or why

b) An empty beaker was weighted. Then, water was filled in the beaker. The temperature was recorded at uniform intervals.