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Showing results for tags 'chemia'.
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How many marks are uncertainties worth in the chemistry ia? If I were to not include them at all how many marks would I lose? If I did them incorrectly how many marks would I lose?
The experiment I'm conducting measures the rate of reaction for varying baking soda (sodium bicarbonate) concentrations. I will be putting tarnished silverware into a bath of water and soda within a beaker that is lined with aluminum foil. I conducted this experiment, and my trials suggest an exponential trend. Now when calculating the rate of reaction, I need the equation in order to find the rate order equation. Using prior research, I can determined the equation to be 3 Ag2S(s) + 2 Al(s) + 3 H2O (l) –––> 6 Ag(s) + 3 H2S (aq) + Al2O3(s). I don't see the baking soda coming into play in this equation, despite being the changing variable (as in factor affecting the rate of reaction). Is this equation being used incorrect, or is there a reason towards why baking soda isn't being incorperated. I assumed I cannot continue to find the rate of reaction without the equation with the changing concentration (being the baking soda). Thank you for your time, please help I'm struggling IA due soon
So, I have somewhat an idea of what id like to do involving my chemistry IA but I'm in need of an opinion and or suggestions. My idea is an experiment testing the affects of Carbonic acid (due to ocean acidification) on shelled organisms and others that use calcium carbonate. Perhaps testing at which concentration it is harmful? or even the effects of acidity on shells? I dont have a specific or elaborate idea and am struggling to think of one all i know is that this topic is important to me and the world itself. All suggestions welcome please!
Hey I am really stuck for my Chem IA. I am doing vitamin c content in lemon juice and how it is affected by temperature and the thing is I have no idea how to calculate what the vitamin C content is in the juice. I have done the experiment whereby I titrated it all with an iodine solution and starch indicator and so on, I just don't know how to get the number which tells me what the vitamin c content is so I can compare between the heated samples. Right now all I have is some numbers saying how much iodine solution was needed to titrate it until a blue colour appeared, which does not really help. So if anyone knows please tell me!!!