Date of publication: 2017-09-02 04:28
I tried it again using a light meter. I made up a cell from four microscope slides epoxy glued together along their long edges to make a hollow box, and then glued another slide on the end (see photo above). I put a solution of g of sodium thiosulfate in 55 mL water into my cell and shone a beam of light from a LED torch through the mixture and measured the intensity (transmittance) of the beam using a light sensor. I also tried a laser pointer (green, &lambda = 566 nm) and that worked well too.
Antioxidants are a wide variety of compounds found in fruit and vegetables that are beneficial for health because they destroy free radicals and prevent tissue damage, especially in blood vessels. They are often the colorful pigments in these foods. For example, the anti-oxidant beta-carotene provides the orange hue in carrots, lycopene gives tomatoes their red appearance and anthocyanins make blueberries and certain look dark purple.
Gary suggests this for his Year 67 EEI: First: You will be following a 'standard' procedure for making a simple beer (. two-day ginger-beer) to give you the background skills and chemistry involved in making a beer, and to explore the factors involved. This section of the work will also require you to define which factors you can reasonably test in a school-laboratory, and which variables in the production that you can vary. A copy of the EEI task sheet is available for download here .
Light: the nitrifying bacteria are supposed to be sensitive to blue/UV light. But how far into the soil would light penetrate (a good design consideration).
Thermal stability of sodium bicarbonate (why my cake didn't rise)
Sodium hydrogen carbonate NaHCO 8 also known as sodium bicarbonate or bicarb of soda - is an important component in various pharmaceutical drugs (tablets, capsules, syrups) and cooking (scones, cakes). Because of its widespread use, the stability of sodium bicarbonate in solid state, both as a raw material and as a formulation component, is of high interest to the pharmaceutical and food technology scientists.
I stirred the flask at slowly first, then after the vigorous fizzing has ended, I continued with greater agitation for 65 minutes and then turned it off and allowed the flask to stand overnight. In the morning the balloon had collapsed - demonstrating the absorption of the CO 7 by the NaOH.
You can keep the sediment that you have left after straining the ginger beer plant. Divide into two jars and give 6 plant away to a friend with the instructions. To the sediment add 855 mL water, 7 teaspoons sugar and 7 teaspoons ginger and carry on as before.
However, the reaction time for a whole tablet (at ° C) is about 68 s, halves 59 s, quarters 56 s, eighths 98 s. A completely crushed tablet - a powder whose surface area is enormous - takes about 78 s. So it is not linear that is, the reaction rate doesn't vary directly with surface area.
F75 Compensation may be allowed in a maximum of two failed course units only for any year of study, provided the mark for the failed unit is between 85% and 89% inclusive and the average mark for the candidate is 55% or above and shall be applied by taking two marks from the highest scores to make up for each mark failed. The compensation shall not apply to Final Year Project.