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A certain substance A has a boiling point of 78 degrees celcius and substance B has boiling point of 110 degrees celcius. Which one will have a higher viscosity?

A certain substance A has a boiling point of 78 degrees celcius and substance B has boiling point of 110 degrees celcius.


Which substance has a higher heat of vaporization?

If 10ml of 0.1M K2Cr2O7 is added to 10 ml of 0.1 M Pb(NO3)2 what mass of PbCr2O7 formed


Calculate the mass of hydrogen formed when 3 g of aluminum reacts with excess hydrochloric acid according to the balanced equation: 2Al + 6 HCl → 2 AlCl3 + 3 H2


molar masses

Thepercentagecompositionofacompoundis79.9%copperand20.1%sulfur. The mass of a sample of the compound is 160.0 g. What are the masses of the copper and the sulfur in the sample?

Two compounds have the same composition as shown in the table below/





Compounds



C



H



A



92.25 %



7.75 %



B



92.25 %



7.75 %





a. Determine the empirical formula of compound A and B

Calculate the pH of a solution that is 0.20M with benzoic acid and .18with its salt, sodium benzoate


A certain concentration method works best when the analyte’s concentration is approximately 10 ppb.


a. If the sampling volume for the method is 0.5 mL, about what mass of analyte is being measured?

A solution is made by dissolving lead nitrate in water.

6.62g of lead nitrate are dissolved in water. The volume of the solution is made up to

250 cm 3 . Calculate the concentration, in mol dm –3 , of lead nitrate Pb(NO 3 ) 2 , in this solution. (relative

atomic masses: Pb = 207, N= 14,O=16)


if 25cm3 of a soltuion of NaOH are neutralised by 27.5cm3 of H2SO4 of a concentration of 0.250moldm-3 what is the concentration of the NaOH?


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