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0.50g of CaCO3 in 1L water at 25°C.
If the distance from the earth surface to the sun surface is 93000000 Miles and the earths radius is 3965 miles and the suns radius is 430,000 miles what is the distance from the center of the sun to the center of the earth?
A mole of twinkies placed end to end would encircle jupiter how many times
When the specific gravity of beer is 1.01 or less, the fermentation process is complete. If a 20.0 mL
sample of beer weighs 20.4 g;
3. A pure white crystalline compound was found to melt at 131.5-132.0oC when taken on a melting point apparatus, and on further heating, the liquid was found to start bubbling at ca. 155-160 oC. The capillary containing the melted compound was set aside to cool, and resolidify. When the sample was retried using that same capillary, the sample melted at 120.6-154.5oC, along with some bubbling. What is the cause of the bubbles? Why is the melting point so wide the second time? Explain by stating what you have learned in this laboratory about melting points.
When performing a melting point on a solid compound using a melting point apparatus, two melting point determinations were made. One sample, which was 1 mm in height in the capillary, possessed a melting point of 133.0-133.5oC. The other sample was 10 mm in height. What would you expect the approximate melting point to be for this sample, assuming identical heating rates of 1°/min? (Hint: heat is applied from the bottom of the sample) (Give an actual numerical approximation!)(Hint: at what temperature would 1g of ice start melting at? At what temperature would 10g of ice start melting at?)
5. For the same solid compound as the question above, if the 1 mm sample was heated at 10o per minute on a melting point apparatus, what would you expect for an approximate melting point? (note that at this heating rate, the sample will melt rather quickly, but again give an actual numerical approximation)
Construction and working of sodium ion battery
Calculate the amount of oxygen gas (O) in a cylinder of 30L,if the pressure is 20atm at 30 kelvin
How many aluminium ions will be discharged by 0.33F?[Avogadro constant = 6.02*10^23
Determine the heat absorbed by 250g of water heated for 20mins and had a temperature increase of 45ⁿC.(Specific heat capacity of water=4.184J/gⁿC)
