How many protons are in Se-2?

How is the mass of a liquid substance affected after it freezes?

Calculate the mass (in g) of a single starch molecule (c6h10o5).

Do you think that the mole should be considered a base unit in the SI system?

Which was the first transuranium element synthesized in laboratory A. plutonium B. technetium C. uranium D. neptunium

Under which conditions will sugar most likely dissolve fastest in a cup of water? a a sugar cube with stirring at 5°C b a sugar cube without stirring at 15°C c sugar crystals without stirring at 5°C d sugar crystals with stirring at 15°C

A solution that is 33.6 % by mass of phenol (C6H5OH) in water is prepared. What is the mole fraction of the phenol?

Describe the law of conservation of momentum

14. What steps should you take to keep parents and the public from viewing your personal information on social networks?

Match the factors which affect the rate of dissolving/dissociation/diffusion.

How would the equilibrium of an exothermic reaction at 25°c be affected if the temperature of the system were reduced? (hint: apply le chatelier's principle) ?