Qualification > Sciences
Chemistry Help needed!:-(
godfather93:
paper 6 only includes the topics from the core content. so petrochemicals and polymers is not at all going tome. Basics on mole can possible come. you need to know the covalent and ionic bonding because it is the basics of chemistry.
Pharoah:
--- Quote --- hey dude can you tell me the answer to my question about those egg shells...its from the year Nov 2000 paper 6...i would be gratefull to you.
Thanks in advance
--- End quote ---
Ok. First you have to react it with HCl. Then filter the solution. The solution will contain CaCl2 which is soluble. If any impurities are present they will appear as residue. Now the ques is for 6 marks so you should put in practical details like use measuring cylinder to add 5 cm3 of HCl and wait till production of effervescence stops before fitering to ensure that all CaCO3 has reacted and the moles of HCl used must be at least double that of the egg shell . And use filter paper and funnel to filter. wet the filter paper so that it becomes easier to filter. Also the filtrate can be left to evaporate and the crystals that are firmed can be observed. If only CaCl2 is present, pure crystals will be present.
Also, the reaction between CaCO3 and HCl is exothermic so you need a test tube holder and have to be careful not to burn yourself. And HCl is corrosive-care required.
Pharoah:
--- Quote --- thanx man ur first one to clearly exaplin and come back and help out again Thank You again !
PS. i also plus repped you ! check it out!
--- End quote ---
Thanks dude! I do what I can. Glad to be of assistance :)
Naruto:
hey...Can you guyz tell me that in chem paper6 when they ask us to draw a smooth line graph do we have to draw it with the help of ruler or without it... i mean like we make a smooth curve
@unown.xu
Thanks a lottt!!!! ;D
Naruto:
Anyone plzzz tell me i have been waiting for a long time :( im solving a past paper where im supposed to draw a smooth line graph so plzzz tell me i have to solve so many papers :(
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