Viscosity Lab Essay

In this experiment we observed carmine powder to better understand the concept of Brownian motion and the role of molecular movement in diffusion. The particles continuously moved in a completely random fashion, and the smaller particles moved with more speed than the larger particles.

The purpose of our experiment is to see how salty it is for an egg to float. When salt is added to water, the mass of the water increases, and the water becomes denser. Objects will float better on a denser surface, they float better on salt water than they do fresh water. When you add table salt to water the salt dissolves and the water becomes denser, the volume increases by a small factor but the mass increases by a large factor. The salt is denser than water to begin with, because the salt has more mass than oxygen and hydrogen in the water molecules.

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

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.

By definition, osmosis is the diffusion of water across a selectively permeable membrane in response to gradients of concentration, pressure, or temperature (G. Audesirk, T. Audesirk, B. Byers). Diffusion is the passive movement of molecules or particles along a concentration gradient, or from regions of higher to regions of lower concentration (Diffusion). In the experiment, osmosis and diffusion occurred where the results indicated a change in mass when the egg was placed in different concentrations of corn syrup solution. My hypothesis stated that if the concentration of the solute is lower than the solvent, then the egg will shrink in size. With a majority of the results decreasing in weight, my hypothesis was proven to be correct.

However, there are some other factors that affect the fall rate of the marble, including; size and the shape of the marble. Therefore, the marble undergoes drag force and the effect of gravity, which all accounts for hydrodynamic forces. Hydrodynamic forces are the forces which slow the snow as it moves through liquids. In this experiment, turbulent flow can affect the snow’s timing to reach the base of the breaker in water as the flow of the fluid is

The only thing that will dissolve in oil is oil and corn syrup.Corn syrup and oil have the same density.

10. I then repeated steps 1-9 using alcohol as my solvent, instead of the 1% salt solution.

Most of the results of the experiment show that as the molarity of sucrose in the solution increases, the percent change in mass of the potato decreases. This is due to osmosis, water moves from a higher water concentration area to a lower water concentration area. From the results table, one can see that the mass of potato in the 0.1M sucrose solution increased by 13%, and the mass decreased by 28% in the 1.0M sucrose solution.

More specifically for the experiment we will need four deshelled eggs, four beakers and distilled water with a certain percentage of sucrose, a timer, and a scale to weigh the eggs. Using the process of osmosis, we will determine the weight of the eggs after being soaked in the solution. The four beakers each had distilled water in them with sucrose but all contained different amounts. One beaker contained 0% sucrose. The other beakers contained 10%, 40%, and an “unknown” amount of sucrose. Before placing the eggs into the solution, we are to weigh each egg separately to the nearest 0.1g and record this in table. Once that step has been completed, we then place one egg in each of the beakers separately that was marked with the amounts of sucrose. At fifteen-minute intervals, remove the deshelled egg from the water inside the beaker and wipe off all the excess water. After that process has been completed, we will weigh each egg separately to see if they have gained or lost their mass/weight. Once each egg has been weighed accurately, the recorded data is placed in the table provided. This step goes on for an hour. The deshelled eggs in this experiment will increase in mass in the different types of distilled water. This lab session provided the class with the evidence that diffusion and osmosis occurs within the different types of solutions.

The volume of the Jelly Marbles that sat in the water have a volume of 1.02 milliliters. Trial 1 for the Jelly Marbles in the food coloring had a volume of 1.03 milliliters and trial 2 had a volume of 1.12 milliliters. The volumes for trial 1, 0.17 milliliters, and for trial 2, 0.03 milliliters, has a big difference. The density for the Jelly Marbles that soaked in water was approximately 1.4 milliliters. Trail 1 for the Jelly Marbles soaked in food coloring also had a density of 1.4 milliliters but, trial 2 had a density of 1.25 milliliters. The density for both of the Jelly Marbles that soaked in the 70% rubbing alcohol can not be found.

Our hypothesis is that the water’s density will make the marble sink faster than all the other liquids. We also agree that vinegar will sink the second fastest because it almost has the same density as water and it is a lot less thick than honey, and canola oil.

The following hypothesis was made in regard to effect of the concentration gradient on the rate of diffusion: The higher the concentration gradient, the faster the rate of diffusion.

The aim of this experiment is to find out if the water’s temperature would affect the time it takes for sugar to dissolve. To do that, we would investigate the time it takes for the a sugar cube to become flat in the bottom of a beaker.

Diffusion is the spontaneous movement of particles from where they are more concentrated to where they are less concentrated. For this experiment, a 14 cm glass was filled with cold tap water. A drop of red food coloring was dropped in the cup. A stopwatch was used to measure the time it took for the food coloring to get to the bottom of the cup. The average diffusion rate was .78 cm a second. If a different color was used, I do not think it would have made a difference in the results. The mood of the person experimenting could possibly alter the results. For example, if a person is under stress, they may accidentally squeeze too much altering the rate of diffusion. If the water was warmer, this may have sped the