Disappearing Cross Experiment Plan ==== I must produce a piece of coursework investigating the rates of reaction. The rate of reaction is the rate of loss of a reactant or the rate of formation of a product during a chemical reaction. There are five different factors, which affect the rate of a reaction (1) Temperature (2) Concentration of a solution (3) Pressure of gases (4) Surface area of solids (5) And catalysts. I have chosen to investigate the effect temperature has on a reaction. If I'd of had enough time, I would of done an experiment for concentration of Hydrochloric acid to see what difference the rate of reaction would be here. I wouldn't do pressure of gases, as most are 'invisible' to the human eye. I wouldn't do surface area of a solid, as the two substances we are looking at are liquids. I wouldn't use a catalyst in the experiment, because firstly I wouldn't know which catalyst to use and secondly it may alter the outcome of the experiment if used incorrectly. · Aim ===== To plan and carry out an experiment to discover how to change the rate of reaction. The reaction being studied is between sodium thiosulphate (Na2S203) and hydrochloric acid (HCl). The reaction I am using is: Sodium Thiosulphate + Hydrochloric acid -> Sodium Chloride + water + sulphur dioxide + sulphur Na2S203 (aq) + 2HCl (aq) -> 2NaCl (aq) + H20 (l) + SO2 (g) + S (s) · Equipment [IMAGE] · Diagram · Method 1) With a piece of paper put on a bold cross, which is easy to see. 2) Put the conical flask on top of the cross with 20ml³of hydrochloric acid. 3) Add 20ml³ of sodium thiosulphate into another flask and heat to specific temperatures with the Bunsen burner (and using a thermometer). 4) Once it is at the correct temperature, add it to the hydrochloric acid and start the stopwatch.
In the experiment “ Talking to plants “ from Mythbusters, potential problems include the use of greenhouses with no sound insulation, a non-homogeneous location and the use of only one specie to infer on a population. In another scientific study, researchers chose to use “ a noiseless growth chamber to prevent any effects from extraneous noise “ and the use “ growth chambers under continuous light at 28 c and 65-75% relative humidity “ in order to maintain a homogeneous location for all plants during the experiment (Jeong et al., 2008) . This helped further explain the findings because with the use of noiseless chambers you can assure that the only noise that the plant was receiving was the one given in the treatment and a valid conclusion
Firstly, an amount of 40.90 g of NaCl was weighed using electronic balance (Adventurer™, Ohaus) and later was placed in a 500 ml beaker. Then, 6.05 g of Tris base, followed by 10.00 g of CTAB and 3.70 g of EDTA were added into the beaker. After that, 400 ml of sterilized distilled water, sdH2O was poured into the beaker to dissolve the substances. Then, the solution was stirred using the magnetic stirrer until the solution become crystal clear for about 3 hours on a hotplate stirrer (Lab Tech® LMS-1003). After the solution become clear, it was cool down to room temperature. Later, the solution was poured into 500 ml sterilized bottle. The bottle then was fully wrapped with aluminium foil to avoid from light. Next, 1 mL of 2-mercaptoethanol-β-mercapto was added into fully covered bottle. Lastly, the volume of the solution in the bottle was added with sdH2O until it reaches 500 ml. The bottle was labelled accordingly and was stored on chemical working bench.
need is water and an ester and we will end up with an organic acid produced as
Cu (aq) + 2NO3 (aq) + 2Na+ (aq) + 2OH- (aq) → Cu(OH)2 (s) + 2Na+ (aq) + 2NO3(aq)
The equation shows how 1 mol of Na2CO3 reacts with 1 mol of H2SO4, so
... the Bible every night, or pray once in the morning and again at night, both times at the foot of the bed. The only thing that matters is that one acknowledges Christ’s existence, lets him into their life, and fully embraces him in all endeavors.
Herein did the Shape of Evil dip his hand, and prepare to lay the mark of baptism upon their foreheads, that they might be partakers of th...
Around the crown: "Glory to God in the highest and on earth peace, good will toward men - Luke, chapter II, verse 14."
Bible and put them into action. This can be done in a number of ways
" Let the word of Christ dwell in you richly as you teach and admonish one another with all wisdom, and as you sing psalms, hymns and spiritual songs with gratitude in your hearts to God."
an enzyme is used to speed up the process in the equation above. In my
Hydrochloric acid + calcium carbonate arrow calcium chloride + carbon dioxide + water. HCl(aq) + CaCO3(s) arrow CaCl2(aq) + CO2(g) + H2O(l) Things that affect the reaction rate of this experiment are: 1. The temperature of the hydrochloric acid. 2.
C6H12O6 + 2 ADP + 4 H+ → 2 C2H5OH + 2 CO2 + 2 ATP + 2 H2O
As more NaOH is added, the pH will become more basic as H2C2O4 .2H2O has been completely neutralized and now an excess of OH- ions are present in the solution.12
to you by your forefathers, but with the blood of Christ, a lamb without blemish or defect."