The Rate of Reaction When Dissolving Sugar
Introduction
I have been asked to perform an investigation on the length of time it
takes for a certain amount of sugar to dissolve in a certain amount of
water at different temperatures. I will investigate whether the time
taken at one temperature and another will be the same, quicker or
slower using scientific methods.
Identifying Key Factors
=======================
The factors that would affect the dissolving rate are: -
· Volume of water
The larger the volume of water, the quicker the sugar will dissolve
because there is more particles for the sugar molecules to collide
with.
· Mass of sugar
The more sugar there is the dissolving rate will be slower as there is
more molecules to collide with the water particles.
· Size of sugar particles
The bigger they are the slower they will dissolve.
· Temperature
The higher the temperature the quicker the sugar will dissolve
The variable I am going to change is temperature. I will keep all
other factors constant to make the experiment fair and so the results
are reliable.
Reasons for doing a pre-test
I am going to perform a pre-test so that I have an idea of the
quantities of Sugar and water I will need to use in my actual
experiment. Doing a pre-test means I will get a more accurate result
when it comes to do the actual experiment.
Pre-test method
Apparatus
· Glass Beaker
· Measuring cylinder
· Tripod
· Bunsen Burner
· Stirring Rod
· Thermometer
· Stopwatch
· Heat proof mat
· For safety: Goggles
· Weighing scales
· Gather equipment and set up as shown below:
· Choose your temperatures (I am going to perform the pre-test with
the temperatures 20°C, 40°C and 60°C)
· Measure 10g of sugar and 100cm³ of 20°C water
· Pour the water and sugar into the glass beaker and start the clock.
· Add 2g of yeast to the water and add sugar (1g, 2g, …up to 5g).
and it is necessary for the back of the gas syringe to be taken out,
The Effects of Concentration of Sugar on the Respiration Rate of Yeast Investigating the effect of concentration of sugar on the respiration rate of yeast We did an investigation to find how different concentrations of sugar effect the respiration rate of yeast and which type of concentration works best. Respiration is not breathing in and out; it is the breakdown of glucose to make energy using oxygen. Every living cell in every living organism uses respiration to make energy all the time. Plants respire (as well as photosynthesise) to release energy for growth, active uptake, etc…. They can also respire anaerobically (without oxygen) to produce ethanol and carbon dioxide as by-products.
For the test for lipids I can use two tests. The first test being the
Reaction Rate Investigation Planning I am trying to work out the rate of reaction between marble chips (calcium carbonate) and Hydrochloric acid. This will be my plan of how to carry out my investigation. There are many factors, which I could change in this experiment. These are 1) Concentration. An increase in concentration means there are more particles.
...th. The test can be to check your blood glucose levels, cholesterol, triglycerides, lactic, and uric acid. And to check if your growing and checking for enlargements of the liver.
The researcher will record the raw scores and calculate the standard deviation for both the pretest and the posttest. A dependent T-Test will be used at the .05 level of confidence to decide if there is statistically significant difference between the mean scores of the two tests given.
It is important however to note that the NH4 and K ions are still in
Determine the reaction order for Na2S2O3 using calculations described in the Background. Show your work. Note that your answer will probably not be an even whole number as it is in the examples.
On a two pieces of paper, we drew a cross and place a beaker on top of
The Effect of Concentration on Reaction Rate Introduction I will be carrying out an investigation into how concentration affects reaction rate. I will be looking at sodium thiosulphate and hydrochloric acid. The reaction is represented by the following equation: [IMAGE]Na2S2O3(aq) + 2HCl(aq) 2NaCl(aq) + H2O(l) + SO2 (g) + S (s) I will add the hydrochloric acid to the Sodium Thiosulphate and time how log it takes for the mixture to turn opaque. I will use a different concentration of Sodium Thiosulphate each time. Prediction
List of the tests to be conducted, material to be tested, the location of sampling, the organization’s name that will perform the test, and the frequency of testing.
* Amount of acid – if there is more acid the rate of reaction will
Second I will describe what these tests are used to figure out and how they are carried out.