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There is an increase in the concentration of H+(aq) ions during this discharge and this can be monitored by titration with a base such as sodium hydroxide. To discharge the battery rapidly but steadily the students Olivia and Kayla at Moreton Bay College used 12V car lightbulbs across the terminals. They asked - is the change of [H+] proportional to the duration of discharge? Perhaps the rate of discharge as well as the duration important. Should they monitor voltage and current as well? You decide. My thanks to their teacher Mrs Cathy King for welcoming me into her lab.
The most probable explanation for the results I gained; as mentioned
previously in my introduction, as light is one of the factors required
in order for photosynthesis to take place, as the intensity of the
light is increased, photosynthesis is able to take place at a higher
Free rate of photosynthesis papers, essays, and research papers.
This reaction rate depends on the concentration of the two reactants and the temperature. Because the sulfur particles are so fine they form a cloudy whitish colloid. The concentration of the sulfur can be measured by the 'cloudiness' of the colloid mixture. The rate of this reaction can be measured by looking at the rate at which the product solid sulfur S(s) is formed. You may have carried out this reaction in Year 10 during the chemical reactions unit. It is usually carried out in a flask placed on a piece of white paper with a black cross on it - and you time how long it takes the cross to disappear. It is an old favourite. In effect, you are making use of the Tyndall effect (or Tyndall scattering), whereby light is scattered by particles in a colloid [see note below].
The electrical conductivity of aqueous solutions has been extensively studied and reviewed for the past several decades. However, most of the theoretical treatments and experimental investigations have been directed toward systems containing only a single cation/anion pair. There are lots of data tables around showing the conductivity of aqueous solutions as a function of their concentration. For example the conductivity of a 5% (w/w) potassium nitrate solution is 58 μS/cm but a 10% solution is just 96 μS/cm (not double as you might expect). The same is true of sodium nitrate 52 uS/cm for a 5% solution but 92 for a 10% one.
Effect of Light Colour on the Rate of Photosynthesis
These results compliment our hypothesis by showing that the rate of photosynthesis does increase with the addition of light energy, since in our experiment the more light energy that was added to the disks, the faster it took all the disks to rise.
(However, plants generate daily variations in concentrations of oxygen and carbon dioxide through their photosynthetic and respiratory activities.) Thermal profiles at midday in corn fields at various stages of growth are shown in Figure 4.4, demonstrating the marked reduction in ground temperature due especially to shading.
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Rate of photosynthesis limiting factors
On considering my experiment, in hindsight, perhaps I would have
gained an even higher rate of photosynthesis if I had made the
temperature of the water slightly lower.
Lab: Exploring the Rate of Photosynthesis - The Biology …
Introduction: "Photosynthesis is the conversion of light energy to chemical energy that is stored in glucose or other organic compounds; it occurs in plants, algae, and certain prokaryotes" (Campbell, G-16).
Thus the rate of photosynthesis can be indirectly measured by ..
This was done by separating the photosynthetic pigments (chlorophyll a, chlorophyll b, carotene and xanthophylls) from one another using paper chromatography.
Light Intensity and Rate of Photosynthesis (Carol Cao) ..
If I had altered the water steadily by 1
degree, instead of making it 25 degrees C straight away, I may have
found that the water only needed to be at 22 or 23 degrees, and the
pond weed would have photosynthesised at a higher rate at this
Factors affecting the rate of photosynthesis
This desire to discover new ways of producing clean energy has lead scientists at Stanford University and other universities to discover a way to harness the electricity produced during the process of photosynthesis.
Factors affecting the rate of photosynthesis 2
I believe that my range of 5 distances (0cm to 100cm) was sufficient,
although as mentioned above, I believe taking a 2nd repeat would have
aided me in gaining a more accurate average result, and then also I
would have discovered if the pond weed needed further time to adjust
to a new light intensity.
Free rate of photosynthesis Essays and Papers - …
My reasons for believing my results are reliable & accurate are
firstly, they agree with the theory behind the rate of photosynthesis
when light intensity is increased, secondly the result which I gained
compared accurately to my prediction, which was well thought out
before it was made, and finally the results I gained for my final
experiment differed so much to the results of my preliminary procedure
which was very inaccurate.
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