Effect of temperature on rate of reaction. INTRODUCTION The rate of a reaction is the speed taken for a chemical reaction to happen, if that reaction has a lower rate, that means the molecules combine at a slower speed than reaction with a higher rate. Some reactions take thousands of years, while others like our experiment can happen in less than a few minutes. An example of very slow reactions is how long it takes for ancient plants and fish to become fossils, this is called carbonization. The rate of reaction also depends on the type of molecules that are combining, If there are lower concentrations of an essential element or compound, the reaction time might be slower! No matter what, reactions happen, Chemicals are always breaking …show more content…
down or combining. The reactions happen over and over again, but this doesn’t mean it always happens at the same speed, a few things affect the overall speed of the reaction and the number of collisions that can occur with the reaction. When you raise the temperature of the water the molecules can bounce around a lot more, they have a lot more energy, When they bounce around more, they are more likely to collide, heating water, causes higher kinetic energy and creates more space for the tablet to dissolve, and travel through the hot water, as a result the tablet can dissolve quicker. Lowering the temperature of the water does the opposite it lowers the amount of kinetic energy, and reduces the space the tablet will have to dissolve. Sometimes in chemistry they mix solutions in ice so that the temperature of the liquid/gas stays cold and the rate of reaction is much slower. AIM The aim of the experiment is to test the effect the rate of reaction (time to dissolve tablet), when using three different water temperatures (cold, room, hot). HYPOTHESIS The rate of reaction dissolving in water that is higher temperature is faster because it has higher kinetic energy. Heat provides more kinetic energy for expansion of the aspirin tablet. Due to the fact the water is heated, it expands. It then leaves more space for the tablet to dissolve and travel through the expanded space in the hot water. MATERIALS AND RISK ASSESSMENT. Risk Assessment: Equiptment: Risk Assessment:: Name Size Quantity Risk Precaution/Management Kettle N/A 1 You may burn yourself. Use standard precautionary methods to make sure the boiling hot water does not burn you. Water 30mL 30mL Water can be accidently spilt and may land on ground making floor slippery increasing risk of injury. Prevent water spilling using standard precautionary methods, take time, and use a funnel if needed. Asprin 1 tablet 3 Aspirin (when broken) fizzes up quickly when broken. Control the fizzing of the tablet, by not breaking the tablet up. Materials: 3 Clear Cups or Beakers.
Measuring cup (if using cups instead of beakers) Thermometer 9 aspirin tablets (3 tablets per test, for 3 trials per temperature) Stopwatch (or phone) Source of hot water (kettle) Ice cubes (or cold water source) Paper to record trials (later transferred into this document) Method Hot water: Boil water until it is as hot as possible. Fill the glass or beaker with exactly 200ml of hot water. Use the thermometer to take the temperature of the water and then record it on your data sheet. Drop 1 aspirin tablet into the water, measure the time required for the tablet to fully dissolve. Repeat this step 3 times for 3 trials, then calculate average on graph. Room temperature water: Fill a beaker or glass with exactly 200ml of room temperature water. Use the thermometer to take the temperature and record it on your data sheet. Drop 1 aspirin tablet into the water, measure the time required for the tablet to fully dissolve. Repeat this step 3 times for 3 trials, then calculate average on graph. Cold water: Fill a glass or beaker with with roughly 120ml of water, add enough ice to adjust the level to 200ml. Stir the ice water and wait until ice is dissolved, make sure water is roughly 200ml, if not add more
water. Use the thermometer to take the temperature and record it on your data sheet. Drop 1 aspirin tablet into the water. Measure the time required for the tablet to fully dissolve. Repeat this step 3 times for 3 trials, then calculate average on graph. Results Trial 1 Trial 2 Trial 3 Average Boiling Water 43sec 31 sec 40 sec 38 sec Ice Water 2 m 55 sec 2m 51 sec 2 m 54 sec 2 m 53 sec Room Temp Water 1 m 45 sec 1 m 52 sec 1 m 50 sec 1 m 49 sec Discussion Discussion: The results change depending on the temperature of the water. Cold or ice water is normally at temperature (below 5 degrees), making the water colder has the power to slow down the process of reaction due to its cold temperature generating less kinetic energy giving the tablet less room to dissolve as a result it lowers the rate of reaction. The ice water is the water that makes the tablet the slowest to dissolve. The tablet making it not speed up the rate of reaction. The room temperature water is at a state where the water is not ‘ice cold’ or ‘boiling hot’, this is a normal rate of reaction, and is the rate the tablet would normally dissolve, as aspirin is taken with normal room temperature water. Conclusion: Hot water makes the aspirin tablet dissolve the fastest, cold water makes the tablet dissolve the slowest. Therefore temperature does indeed affect the rate of reaction.
Start with the hot water and first measure the temperature. Record it. 8. Then pour 40 ml into the beaker. You can measure how much water was used by looking at the meniscus.
Use a stopwatch or timer to determine the amount of time it takes for the tablet to completely stop fizzing out or until it completely stops dissolving.
* It was almost impossible to tell when the Alka-Seltzer tablet had dissolved, each time the experiment was done. This was a huge problem for the experiment as this could have totally caused problems to the experiment. A special type of detector apparatus, which bleeped when the correct amount of Alka-Seltzer tablet dissolved, could improve this, each time the experiment was done.
Firstly, when testing temperatures at 30°C and 40°C, the water was. sometimes heated more than needed, so I had to wait until it cooled. down to the required temperature. To avoid this happening, a. thermostatic water bath could have been used, because I could set it. to the required temperature.
9. Repeat step #8. Using a pipet, add small amounts of boiling water from the hot plate to the water bath and collect pressure and temperature data. For each new temperature, record the air pressure and vapor pressure. Continue until you have gathered 6 measurements that range from room temperature to 40 °C.
Place one egg in a beaker. Fill this beaker with distilled water to just cover the egg. See Figure 1. Note the appearance of the water at this time and record your observation in Data Table 3. CAUTION: Be careful to avoid breaking glassware.
...r 15minutes. I would keep the method the same as I did doing this investigation but try a salt solution instead of sucrose as it would be easier to make different concentrations by having a certain amount of salt per 100cm³ of distilled water.
In a 250ml beaker place 100mls of water, measure the temperature of the water and record this initial temperature onto a table. Set the timer and add one teaspoon of Ammonium Nitrate to the water, stir this continuously until the Ammonium Nitrate has dissolved. After 1 minute measure the temperature and record it, do this for a further 2 minutes (3 minutes in total). Repeat this process for a total of 10 teaspoons.
Normal water will not do because of the impurities in it. · Methyl Orange indicator - The colour of this indicates when the sodium hydroxide has been neutralised by the hydrochloric acid. · Conical Flask - This is used to react the aspirin tablets with the sodium hydroxide. It is more appropriate to use as the shape of it makes it less likely that any should spill out. · Burette - This is used to add the hydrochloric acid to the sodium hydroxide.
have the same amount of water to test on. It will also have a roughly
that the rate of reaction must be fast enough to make as much of the
The pH of the solution would alter the rate of the reaction if it was
Chemical kinetics is the study and examination of chemical reactions regarding re-arrangement of atoms, reaction rates, effect of various variables, and more. Chemical reaction rates, are the rates of change in amounts or concentrations of either products or reactants. Concentration of solutions, surface area, catalysts, temperature and the nature of reactants are all factors that can influence a rate of reaction. Increasing the concentration of a solution allows the rate of reaction to increase because highly concentrated solutions have more molecules and as a result the molecules collide faster. Surface area also affects a
My aim is to see the effects of a change in temperature on the rate of
Take a pot filled with the 200ml of water and set it on the stove until it starts to boil.