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of the following statements about different elements are true except

Potassium is an alkali metal. Selenium is a metalloid.

Magnesium is an alkaline earth metal. Iodine is a halogen.

Xenon is a noble gas.


give one advantage of using nano particles in sun creams



Explain the chemistry behind the buffer system in blood.


You found an unknown substance at home .you want to know whether the substance is an ionic compound or covalent compound you will test whether the unknown substance dissolve in water and organic solvent or not

The isotope strontium-90 is produced during the testing of nuclear weapons. If 100.0mg of strontium-90 was released in the atmosphere in 1960, how much of the radioisotope remains 85 years later? The half-life of strontium-90 is 29 years. Show all your work.

1.Calculate the freezing point of solution containing 0.600 kg of CHCl3 and 42.0 g of Eucalyptol (C10H18O) , a fragrant substance found in the leaves of eucalyptus tree. Kf for CHCl3 is 4.68°C/molal and normal freezing point is -63.5°C.



1.Calculate the freezing point of solution containing 0.600 kg of CHCl3 and 42.0 g of Eucalyptol (C10H18O) , a fragrant substance found in the leaves of eucalyptus tree. Kf for CHCl3 is 4.68°C/molal and normal freezing point is -63.5°C.




2.List the following aqueous solutions in order of their expected freezing points ( from lowest to highest) : 0.50 m CaCl2 ; 0.15 m NaCl ; 0.10 m HCl ; 0.050 m HC2H3O2 ; 0.10 m C12H22O11. Then explain the reason why you arrange it that way.

List the following aqueous solutions in order of their expected freezing points ( from lowest to highest) : 0.50 m CaCl2 ; 0.15 m NaCl ; 0.10 m HCl ; 0.050 m HC2H3O2 ; 0.10 m C12H22O11. Then explain the reason why you arrange it that way.

Calculate the solubility of Ca(OH)2 in a 0.469M CaCl2 solution at 31⁰C, given that the Ksp of Ca(OH)2 is 4.96 X10-6 at that temperature and give the answer in milli Molar units.


What happens to the blade as it was placed on water, kerosene, and ethanol? Differentiate them. Why is this phenomenon possible?


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