LABORATORY REPORT Activity: Enzyme Activity Name: Natalie Banc Instructor: Elizabeth Kraske Date: 09.22.2016 Predictions 1. Sucrase will have the greatest activity at pH 6 2. Sucrase will have the greatest activity at 50 °C (122 °F) 3. Sucrase activity increases with increasing sucrose concentration Materials and Methods Effect of pH on Enzyme Activity 1. Dependent Variable amount of product (glucose and fructose) produced 2. Independent Variable pH 3. Controlled Variables temperature, amount of substrate (sucrose) present, sucrase + sucrose incubation time Effect of Temperature on Enzyme Activity 1. Dependent Variable amount of product (glucose and fructose) produced 2. Independent Variable temperature 3. Controlled Variables pH, amount of
In our gummy bear lab experiment, we experienced osmosis, the water version of diffusion. My lab partner, Maggie, and I were given two yellow gummy bears. The first one measured at 10 mm in both thickness and width, and 21 mm in height. The approximate volume was 2,100 mm^3, and the mass was 2.567 grams. The second one was 11 mm in thickness, 9 mm in width, and 20 mm in height. The volume was 1,980 mm^3 and the mass was 2.56 grams. After our initial measurements, we placed the first gummy bear in a plastic bag and sealed it. Then we gently dropped the other one in 150 mL of water. We then let both of those sit for 24 hours.
The topic that the scientist has researched is the reaction rate of different particle sizes. In the experiment, the scientist will discover how the particle size of Alka Seltzer affects the rate of chemical reaction with water. The independent variable in the experiment is the particle size of the Alka Seltzer, while the dependent variable is the rate of reaction, or the volume of Carbon dioxide. The volume of carbon dioxide will be measured in ml. Also, a few of the constants in the experiment will be the amount of water, and amount of tablets.
The topic the scientists will be conducting is called Alka-Seltzer Tablets, Rate of Reaction. Here the scientists will be testing the reaction time of Alka-Seltzer tablets. The scientists will be testing that by taking various substances and dropping in one Alka-Seltzer tablet per each cup of liquid. The scientists will be testing the variables include the temperature such as cold water, salt water at room temperature, room temperature water, vinegar water at room temperature that’s the independent variables. The dependent variable is the rate of dissolving in seconds. The constant would be the brand of Alka-Seltzer tablets and amount of liquid. Finally, is the control variable and here it would be the room temperature water with nothing added
Osmosis is the net movement of water going from high to low on the concentration gradient. During this experiment we observed osmosis when we put an egg into corn syrup. When we placed the egg here the water moved from high concentration to low so the water in the egg moved out, this created a hypertonic environment.
This scientific question is, does the different kind of gum increase or decrease your concentration? This question was chose because many people in the world always are looking for some tips on what helps them concentrate, and chewing gum is a very easy way to help improve concentration. The Independent Variable is the type of gum, the Control Group is Bubble Gum, the Experimental Group is the Spearmint, the Dependent Variable is test scores, the Constant Variables are same timed test, same timer, and same brand of gum. The hypothesis for this science fair project is if spearmint gum is chewed then the person's concentration will be increased. This hypothesis was picked because spearmint gum is minty and the scientist thought that maybe mint impacted the brain the most. The other two gums that were used in this experiment were Bubblegum and Watermelon. The scientist thought that spearmint would be the fastest in the multiplication and he was not really sure what to expect.
In the first part of the experiment, Part A, the standard solutions were prepared. As a whole, the experiment was conducted by four people, however, for Part A, the group was split in two to prepare the two different solutions. Calibrations curves were created for the standard solutions of both Red 40 and Blue 1. Each solution was treated with a serial 2-fold dilution to gain different concentrations of each solution.
The average experimental mass was 144.5 grams per mole as shown in Figure 6, which is a 20% error from the accepted molar mass of glucose 180.16 grams per mole as is shown in Figure 7. Errors could have come from the ice bath not being cold enough, not all the powder transferred into the 11 dram vial, and not dissolving all of the powder. The usage of tap water instead of distilled water would have affected the results for tap water contains other ions which would then affected the freezing point depression. Salting icy roads and walkways lowers the freezing point of the water that forms ice which leads to melting and prevents falling snow or rain from being able to freeze.
In this lab we used two processes called Diffusion and Osmosis. Diffusion is the movement of molecules from areas of high concentration to areas of low concentration. Diffusion is a process that requires no energy and involves smaller non-polar molecules. In Figure 1 you can see the molecules spreading throughout the glass from the area of high concentration, so that the areas with low concentration are filled evenly as well. The other process was osmosis. Osmosis is the diffusion of water through a membrane from an area of high contraction to an area of low concentration. Osmosis happens in three different environments. Osmosis is like diffusion in it requiring no energy.
In this task I will be researching the effect that acid rain has on the rate of plant growth. Acid rain is any type of precipitation with a high pH, with high levels of nitric acids. The reason why I had chosen this topic was because acid rain seems to have a great effect on the effect of plant growth, and plants play a very important role in our ecosystem. Acid rain is a major problem in our environment when we are not able to neutralize the acidity.
The purpose of the experiment was to observe the cell and infer which direction of the flow of the water due to the cell volume change. This lets us to notice what in the red blood cell was able to permeable across the cell membrane, since they were placed in different osmolality solutions we are able observe the tonicity of the cell’s behavior. When the Erythrocyte is placed into a hypotonic solution, the cell will swell because water will move gradually into the cell. The concentration of solutes are lower outside than the inside of the cell, so the water will move in the cell and cause the cell to swell. If the cell was placed to hypertonic solution, the solution has a higher solute concentration than the cell, so the water moves out the cell and causes the cell to shrink. When the red blood cell is placed into a isotonic solution, the concentration of the
It justifies the idea that increasing the concentration of sucrose does in fact speed up the rate of osmosis, an therefore increase the mass of the Visking tube. This happens due to the water molecules moving from a high water concentration to a low water concentration. Another reason why this hypothesis is correct is because sucrose particles are too large to go through the membrane therefore the sucrose does not diffuse into the water. According to the mean graph there is a clear outline that indicates constant acceleration, which justifies that the increase of the independent variable affects the dependent