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 …show more content…
The scientists will conduct the experiment by taking four cups of water one that is just salt mixed with water, another that is just water, a third cup that is just ice water and finally a forth cup that is vinegar and water mixed. After that the scientists will drop one Alka-Seltzer tablet into each cup and see how long it takes for it to completely dissolve. The scientists will conduct these three times for …show more content…
Buddies, S. (n.d.). Carbonation Countdown: The Effect of Temperature on Reaction Time. Retrieved October 05, 2017, from https://www.scientificamerican.com/article/bring-science-home-carbonation-time/ 2. Chicago Section American Chemical Society. (2007, April 02). Retrieved October 05, 2017, from http://chicagoacs.org/articles.php?id=183 3. Plop, Plop, Fizz Fast: The Effect of Temperature on Reaction Time. (2017, July 28). Retrieved October 05, 2017, from https://www.sciencebuddies.org/science-fair-projects/project-ideas/Chem_p027/chemistry/alka-seltzer-effect-of-temperature-on-reaction-time#background 4. Why does Alka Seltzer fizz? (2000, April 01). Retrieved October 05, 2017, from http://science.howstuffworks.com/innovation/science-questions/question116.htm 5. Big Pieces or Small Pieces: Which React Faster? (n.d.). Retrieved October 05, 2017, from https://www.sciencebuddies.org/science-fair-projects/project-ideas/Chem_p028/chemistry/big-pieces-or-small-pieces-which-react-faster#summary 6. Dictionary.com. (n.d.). Retrieved October 05, 2017, from
Beneath Our feet Experiment 1: We put different types of rocks in to three piles that were called Igneous, Metamorphic and Sedimentary. Igneous comes from a volcano. Metamorphic is heat and pressure and Sedimentary is a mixture of conglomerate, fossils and layers. Experiment 2: We put chalk and 3 spoons of sand into a cup and shook it really hard. Some of the sand turned pink which was the colour of the chalk.
How does temperature affect the bounce of a tennis ball My science fair project is about tennis balls and temperature. I chose this topic because I am interested in how temperature affects how high a tennis ball bounces. When the ball hits the floor it expands and when it comes up then it comes back up it contrasts. My question that is going to be answered is,how does temperature affect the bounce of a tennis ball?
Introduction Alka-Seltzer has been on the market since 1931 and has helped to relieve indigestion and upset stomach. The tablets began to fizz and bubble when dropped into water. “The fizziness happens when baking soda (sodium bicarbonate) and citric acid react chemically in water. They yield sodium citrate, water and carbon dioxide gas, which causes bubbles.” Based on this information, we will measure the reaction time of AlKa- Seltzer dissolved in 200 ml of water at 3 different tempertures in the first portion of this experiment.
The higher the temperature, the faster it takes for the citric acid and baking soda to react. When the temperature is lower, it will take less time for the chemicals to
The effect of pH on the speed of enzyme interaction with substrate chemicals Hypothesis: About pH: If the pH level is less than 5, then the speed of the enzyme reaction will be slower. About temperature: If the temperature stays the same, then the speed of the enzyme reaction will not be completely affected. Background information: The function of enzymes is to speed up the biochemical reaction by lowering the activation energy, they do this by colliding with the substrate.
We measured the elapsed time of bubble production in seconds as the dependent variable, and used the condition of the tablets as the independent variable. The control is the amount of Alka-Seltzer and the water temperature. One tablet was used in all the beakers and the water was all the same temperature. The results showed the the tablets with greater surface area dissolved faster than their peers. The quartered tablets bubble production (54.77 secs) was faster than the whole tablets (77.32 secs), while the crushed tablet’s bubble production (27.28 secs) was faster than the quartered tablets.
The soda water will be stored in 5 different temperatures : 5℃, 15℃, 25℃, 35℃, and 45. The desired temperatures will be achieved by using the water bath and refrigerator. I chose phenolphthalein as the indicator, because it is commonly used for titration and is a weak acid. Phenolphthalein is usually used when the solution is strong base and weak acid. When it is added into an acidic solution, the solution will be colourless; when it is added into an alkaline solution, the solution will turn pink.
The effect of the random errors from this experiment might due to the inaccurate timing as the reflect time to stop the stopwatch when 30cm3 of carbon dioxide is collected in 100mL measuring cylinder is often various from time to time. Time may be longer or shorter than the actual time taken to collect 30cm3 of carbon dioxide. This will then lead to the wrongly calculation of the rate of reaction as the formula of the rate of reaction is: Rate of reaction=1/(Time taken to collect 30.0cm³ of carbon dioxide (s)) Next, the sources of the random errors in this experiment are the variation in eye level when taking the readings of a measuring cylinder to collect 30cm³of carbon dioxide and the widely spaced graduation mark on a 100mL measuring
This does not occur with every collision, so certain methods are used to increase the probability of a successful collision, and thus increasing the rate of reaction. One of these methods is increasing the concentrations of the reactants. Increased concentrations results in particles colliding more frequently, and more successful collisions will occur. On a graph, there would be a decreasing curve as the concentrations of reactants decreases as the reaction
The effect of the temperature on the reaction time of human hand responding to a sight stimulus Design Research Question: How does the temperature affect the reaction time of human hand in responding to a sight stimulus? Hypothesis: Temperature is an important factor in regulating blood supply and nerve signals. Lower temperatures decrease the nerve signals from brain to hand, thereby slow the reaction (Ascroft). When the hand is submerged in cold water, the sensory receptor nerves in the skin recognize the fall in temperature and send signals to the hypothalamus.
Hypothesis We hypothesize that if caffeine levels are increased, then time taken to run a lap will decrease when time is a function of caffeine level. Because of this and the fact that Dr. Pepper has more caffeine, we believe that when we give the test subjects the Dr. Pepper they will run the fastest. McDonald 's sweet tea contains 12.5 mg of caffeine per 118.3 ml, Dr.Pepper contains 33.3 mg of caffeine per 118.3 ml, and of course water contains 0.00 mg of caffeine per 118.3 ml. We have reason to believe this will be the result based on other experiments done that prove that caffeine improves reaction time and agility.
Abstract— “An explanation for why hot water will sometime freeze more rapidly than cold water is offered. Two specimens of water from the same source will often have different spontaneous freezing temperatures; that is, the temperature at which freezing begins. When both specimens supercool and the spontaneous freezing temperature of the hot water is higher than that of the cold water, then the hot water will usually freeze first, if all other conditions are equal and remain so during cooling. The probability that the hot water will freeze first if it has the higher spontaneous freezing temperature will be larger for a larger difference in spontaneous freezing temperature. The keys to observing hot water freezing before cold water are supercooling the water and having a significant difference in the spontaneous freezing temperature of the two water specimens”.
So I decided to learn the real science behind it. Another reason why I thought it would be cool to do this project is because I thought it would be cool if I did where I can substitute chemicals to inflate a balloon. So, I came up with the question which liquid can inflate a balloon faster. First Alexis is going to talk about the independent variable why and what substances Alexis will be using. The reason Alexis will be using.
There was no obvious trend for an increased reaction time with increased percentage of caffeinated beverage consumed. This is because the trial group who drank the 50% caffeinated beverage had, on average, faster reaction rates than the trial group who drank the 100% caffeinated beverage.
The chemical equation for this experiment is hydrochloric acid + sodium thiosulphate + deionised water (ranging from 25ml to 0ml in 5ml intervals) sodium chloride + deionised water (ranging from 25ml to 0ml in 5ml intervals) + sulphur dioxide + sulphur. As a scientific equation, this would be written out as, NA2S2O3 + 2HCL + H2O (ranging from 25ml to 0ml in