Having different temperatures of potatoes would help us see which one of three potato temperature would produce more enzymes. The dependant variable was the the amount of activity (bubbles) produced. Measuring this would help us determine which temperature of potato produced more activity. The potato with the most bubbles, the room temperature potato, would be the one with the most enzyme activity. There were many controlled variables.
Morever, for measuring the density using hydrometer large sample volume is required. Conclusion In conclusion, almost our group reached main target. We used two different methods which were hydrometer and density bottle method in order to measure the density of water at different temperatures. We calculated the densities of water which were 995, 992.5, 991, 990 kg/m3 for the first part and 967 kg/m3 for the second part. Finally we compared these two methods in order to decide which method is more suitable.
ABSTRACT To catalyze a reaction, an enzyme will grab on (bind) to one or more reactant molecules. In this experiment we examined how increasing the volume of the extract added to the reaction would affect the rate of the reaction. The enzyme used was horseradish peroxidase which helps catalyze hydrogen peroxide. Using different pH levels, the absorbance rate of the reaction was measured to see at which condition the enzyme worked best. The rates of absorption were calculated using a spectrophotometer in 20 second intervals up to 120 seconds.
Each group was assigned a different percent of sucrose solution out of the four variables; 0% , 5%, 10%, and 15%. After we filled the beaker we then got two potato cores. Once we had the cores we cut the skin off the ends. Following this we then cut the two potato cores into four 2.00 cm potato cores. After they were cut into 2.00 cm each we found the mass.
Background Information: Yeast fermentation is directly affected by the change in temperature, because the rate of chemical reactions is affected by temperature. If the yeast has been exposed to its optimum temperature (66.667 degrees Celsius) then it will give off the highest carbon dioxide production. As the temperature gets higher, the yeast will produce more carbon dioxide, until at some point carbon dioxide production will decrease, that is when the yeast cells have become denatured due to the increase in temperature. Chemical reactions
How a Solute Concentration Gradient Affects Osmosis Across Semi-Permeable Membranes? By Josie Lockwood, MYP 4 Research Question: The topic that I will be investigating is: how does a solute concentration gradient affect osmosis across semi-permeable membranes? Introduction: The experiment that I will carry out is relevant as it helps us understand everyday concepts within the world: specifically, diffusion and osmosis. Before we consider the process, we must look at the history of these concepts. Osmosis was discovered and named by French physiologist Henri Dutrochet in 1826.
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 aim of this experiment was to find out how many sugar did the potato include, how many sugar did we have every day by eating the potato. To know the sugar that includes in the potato we have to compare the mass of the potato before and after the experiment with different concentration of sucrose solution. We went through our procedure, put the result into the data table and calculate the percent change to the graph. And get the osmolarity bass on the graph we have. The mass of the before the experiment was ranged from 8.520 g to 18.46g.
Collisions increase or become more violent between molecules at higher temperatures or decrease as the temperature is lowered. Some factors that influence the speed of a chemical reaction are: (1) surface area of starting reactants; (2) concentration of reactants; (3) temperatures. The particle theory states that a solute dissolved takes place at the surface of the solvent and the larger the surface area of the particle the longer it will take to dissolve. The smaller the area the faster it will
The economic logic behind protectionist immigration agendas is that an increased population increases the labor supply and stops there. In this scenario, the equilibrium wage rate of labor supply and labor demand would be lower than the pre-immigration equilibrium wage rate, and the logic holds. Instead, separating scenario from real-world application would present previously unaccounted for effects. Being so, what actually occurs is as follows. As before, as the population increases with immigration, the labor supply would also increase, but the increased population would also lead to increased consumer spending and demand (i.e.