Lab 2 Some Factors Affect Reaction Rate Essay

In reference to the collision theory, molecules act as small spheres that collide and bounce off each other, transferring energy among themselves when the collide. In order for a reaction to occur, there must be collisions between molecules. Through experimentation, factors are discovered that influence the reaction rates of chemical reactions include the concentration of reactants, temperature, surface area, the physical state of reactants, and a catalyst. This experiment regarding the factors that affect reaction rate tests the effects of increased concentration and

 Please do the following analyses using the data in the “DoubleClick” sheet of the excel file

After the experiment, I thought about and considered that if the rate of the reaction in which the alka seltzer tablet dissolves is related to the surface area, so by increasing the surface are it will increase the rate of reaction to when the tablet dissolves in the water. By timing the tablet has it dissolved with the water, the water began to fizz up. My hypothesis was proven correct how I said that the surface are of a half crushed tablet will dissolve faster, I had hypothesized right. It had been that the half crushed tablet had dissolved much faster then the other areas. By increasing the surface area the reaction rate of the tablet will dissolve much faster.

Statement of Inquiry: What is the effect of changing a factor on the rate of chemical reaction?

Three factors that can affect the rate of reaction are temperature, pH and the salinity.

This image explains that the higher the temperature, the concentration, and the pressure the faster the rate of the reaction is.

5) Graph the equation you wrote in step four superimposed over the original data. Comment on how well or how poorly the equation fits the data.

To start this experiment, set up the gas collecting apparatus. To start Part A, add approximately 15mL of distilled water to the test tube and record the temperature. Use about half of an Alka-Seltzer® tablet and record the mass. Close the test tube with the stopper with the tubing and tilt the test tube so the water and tablet react. When the reaction is finished, record the volume of CO2 recovered by lining the meniscus of the graduated cylinder up with the water level.

The scientist’s topic reveals around temperature. The scientist trying to figure out which temperature has the fastest reaction time. The independent variable for this experiment is the different temperatures being used, the dependent variable is the reaction time for the Alka-Seltzer tablets.

e) Determine the difference between the two time values, Delta X and record this value in Table 2 (to the nearest whole number) as "Response Time"

The experiment confirmed that our hypothesis was correct, the hotter the water is, the faster an Alka-Seltzer tablet dissolves faster. We expected the hotter water to dissolve the tablet faster because the particles move faster, thus making the tablet dissolve faster as well.

Alka Seltzer is a medical drug used for pain relief and used for relieving indigestion. For example, if you have a stomachache or some indigestion problems, Alka Seltzer may help neutralize the stomach acidity. Not only that, Alka Seltzer is also used for cleaning household items, such as vases or jewelry. Alka Seltzer contains citric acid and sodium bicarbonate, which makes it dissolve and release carbon dioxide gas when dropped in water. In this experiment, my lab partner, Rebecca, and I are trying to find a way to make Alka Seltzer dissolve faster in water. Rebecca and I both decide that if we increase the temperature of the water or make the water hotter, then the Alka Seltzer will dissolve faster because I know when salt and sugar dissolve in hot water, they dissolve faster. I predict that this same result would apply to this experiment.

Of the variables listed in question #1 (with the exception of the one chosen as your experimental variable), write in, next to each one above, how you will control it in your experiment. (1 ½ pts.)

Insert a complete data table, including appropriate significant figures and units, in the space below. Also include any observations that you made over the course of Part II.

Kinetics of chemical reactions is how fast a reaction occurs and determining how the presence of reactants affects reaction rates. In this experiment the rate of reaction for Fe+3 and I- is determined. Because the rate of chemical reactions relates directly to concentration of reactants, the rate law is used to find the rate constant, and calculated with specified temperatures.