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Alli's practical science
Добавлен 14 авг 2019
Independent t test equal variance
How to conduct an independent t-test in excel (assuming equal variance)
Просмотров: 19
Видео
Descriptive statistics Mean Mode Std Dev
Просмотров 11Месяц назад
How to calculate descriptive statistics in Excel
Faecal egg extraction method
Просмотров 1142 года назад
Farm animals can contain parasites in their guts. Some parasite eggs are passed out with the animal's poo. This video shows you how to extract the parasite eggs to conduct faecal egg counts to decide on if treatment with an anti-parasite drug is needed
Identifying unknown organic solutions
Просмотров 1874 года назад
Use organic reactions to identify amines, carboxylic acids, primary alcohols, aldehydes and ketones. Refresh your memory on organic tests by watching ruclips.net/video/66Y0GuF9Rgo/видео.html
Organic tests
Просмотров 854 года назад
Learn how to carry our reactions to identify amines, carboxylic acids, primary alcohols, aldehydes and ketones. Now have a go at identifying unknown organic solutions
Testing foods for protein
Просмотров 834 года назад
See how to test different foods for proteins. Do bread, cheese spread, banana and milk contain proteins?
Testing foods for lipids (fats)
Просмотров 2,5 тыс.4 года назад
See how to test different foods for lipids. Do bread, cheese spread, banana and milk contain lipids?
Testing foods for starch
Просмотров 2654 года назад
See how to test different foods for starch. Do bread, cheese spread, banana and milk contain starch?
Testing food for reducing sugars
Просмотров 9104 года назад
See how to test different foods for reducing sugars. Do bread, cheese spread, banana and milk contain reducing sugars?
Food tests (testing foods for macromolecules)
Просмотров 9 тыс.4 года назад
Learn how to test different foods for protein, lipids (fats), starch and reducing sugars. Have a go at identifying the food groups in bread, cheese, banana and milk.
TLC (thin layer chromatography) of pigments from spinach
Просмотров 20 тыс.4 года назад
Learn how to extract photosynthetic pigments from plants. Learn how to prepare and run chromatography to separate the plant pigments. See the results and calculate Rf values for the pigments.
Extracting fat from milk
Просмотров 12 тыс.4 года назад
Learn how to use solvents to extract the fat from milk. Use this to calculate the amount of fat in milk.
Fizzy drink distillation (short)
Просмотров 544 года назад
Learn how to distil the components of fizzy drinks. Shows you how to distil the drink into three components. See how to test the component parts for smell, pH and sugar content. For more details on testing for sugars see ruclips.net/video/k65wgrP25xo/видео.html
Fizzy drink distillation (Raspberryade) - Part 2 testing the products
Просмотров 294 года назад
Fizzy drink distillation (Raspberryade) - Part 2 testing the products
Fizzy drink distillation (Raspberryade) - Part 1 distillation
Просмотров 414 года назад
Fizzy drink distillation (Raspberryade) - Part 1 distillation
Identifying unknown inorganic solutions by cation and anion tests
Просмотров 19 тыс.4 года назад
Identifying unknown inorganic solutions by cation and anion tests
Using spectrophotometry to determine the concentration of unknown copper sulphate solutions
Просмотров 7 тыс.4 года назад
Using spectrophotometry to determine the concentration of unknown copper sulphate solutions
Determining the melting point of a solid (aspirin)
Просмотров 5 тыс.4 года назад
Determining the melting point of a solid (aspirin)
Measuring conductivity of salt solutions
Просмотров 1,6 тыс.4 года назад
Measuring conductivity of salt solutions
Making an agarose gel for gel electrophoresis
Просмотров 1635 лет назад
Making an agarose gel for gel electrophoresis
Culturing microbes - streak plate (short)
Просмотров 115 лет назад
Culturing microbes - streak plate (short)
Culturing microbes - slope culture (short)
Просмотров 5755 лет назад
Culturing microbes - slope culture (short)
Culturing microbes - streak and slope cultures
Просмотров 1825 лет назад
Culturing microbes - streak and slope cultures
jfc, did you have to use hexane and isopranol?
Thank you Ma'am!
im doing a test on this and literaly have no idea with the reduceing sugar one what are we eaven looking for??
❤❤😂🎉😢
go to hell
why u pressed over a science video 💀
@@nailasymmone i needed 2 for school nigga
Forgot I had this account but I'm actively doing a test as I watch this
real
TVAH?
YES 😭@@Dazed_Rodeo
@@sEm_asmr PFT GLLLL WHICH TEACH
@@Dazed_Rodeosame lol
perfect one. Great job, you just showed the whole procedure with such a simplicity.
But ex. FeSO4 precipitate is blue-green and not white?!
Can you give a place where I can study theory for this
Allery chemistry has a video on qualitative analysis and you can also use the detailed notes on physicsandmaths tutor
@@Mahi-hh5xj For me, finding the "cation" part is easy, but the "anion" part is really difficult, can you give any tips, I need it for a competition in 4 days
@@Mahi-hh5xj Can you send a link of the notes
Hello, are you using silica gel or paper as a stationary phase?
Is it necessary to add nitric acid for anions test??
thank you
How much fat was extracted from 7ml milk
now i understand
What’s the molarity of this solution? And to how many decimals?
How much NaHCO3 will be obtained after mixing Na2CO3 with water containing atmospheric CO2? Is reaction "Na2CO3 +H2O +(atmospheric) CO2 -> 2 NaHCO3" exothermic?
Yes the reaction is exothermic
8
What is 2nd solvent mixture added? Time 1:06 sec???
Hexane I think
Is that milk safe to be consumed by humans after extracting the fat. Hearing the names of the solvents used would keep me from drinking the milk. 😊
Did you centrifuge the bottom layer?
Ehat would be the ration of hexane and isopropyl alcohol?
3 parts hexane, 2 parts isopropanol
Thank you. it will help me in my pratical exam
Kindly share notes
thank you
Thank you
U did it wrong u okuz
not out the top?
Amounts of milk to solvents?
I added 5 ml of milk
Apologies, 7 ml of milk
Tqsm ❤️
What is the solvent ? I couldn’t hear it
Hey is there any way to improve this method
Can you also use other solvents? We cant use hexane.
yes, you don't have to stick to hexanes you can use almost any non-polar solvent.
thanks so much!
Thank you, was too helpful
Just a question; I don’t understand the last part where you say you’re going to evaporate the solvent; what method are you using? Heating?
The solvent is evaporated by gently heating it in a water bath within a fume cupboard
Respected mam, can you tell me what you used for complexing copper sulphates such as EDTA or any else. If you used EDTA then how much concentration of EDTA and how much quantity you added. or you directly took copper sulphate solution for absorbance. please replay.
May I know what do you called this method of fat extraction? Thank you
It is a solvent extraction
@@allispracticalscience503 much appreciated! :)
would this be a quantitative analysis?
Yes it is quantitative analysis
How much Agno3 concentration
thank yyyoouuu , keep doing 3>
Which solvent your using?
It was a mixture of hexane (3 parts) and isopropanol (2 parts)
@@allispracticalscience503 in terms of volume or mass?
when i did it in school used the grass with sand i dont know what will the sand do tho
The sand will help to grind down the leaf structure and break open the cells so it is easier to extract the photosynthetic pigments
What is the chemical used other than acetone while sample preparing
it is hexane
@@allispracticalscience503 why do you mix hexane and acetone when grinding the leaves? what is the purpose?
@@evamoses9720 Leaves contain many different pigments for photosynthesis. Some of these are more soluble in hexane and others are more soluble in acetone. By using a mix of both you are more likely to extract all the different pigments
@@allispracticalscience503 thank you!! ☺️☺️
Thank you!
thank you so much 😊😊
Yo you have all this lab equipment but you can't buy a 15 dollar camera stand to be able to show us this without shaking the whole time lmao. Either way thank you for showing us this and putting up the effort to do the video to educate people.
its not cheese spread its cream cheese!!!
Shes British dude!!! lol
#onlineschool
hi philippines
Guys, we all know what we're here for. School assignments.
hehe
lol ikr