Assuming no mass escapes, explain why the mass of a rusted nail is greater than the mass of a nail before it rusted

The half-life of strontium-90 is 28 years. how long will it take a 52 mg sample to decay to a mass of 13 mg?

If the electronegativity difference between the elements in the ionic compound nax has the ratio of 2 to 1 what element is x

What makes the smell in chlorine?

What explains the relationship among elements, compounds & mixtures

Given a diprotic acid, H2A, with two ionization constants of Ka1=2.3*10^ - 4 and Ka2=3.8*10^-12, calculate the pH for a 0.142M solution of NaHA.

What characteristic is shared by most simple polyatomic ions? A) They are anions. B) They are bonded ionically. C) They are cations. D) They have positive charges.

Potassium ions (k+) have a positive charge. What happens to a potassium atom electrons when it becomes an ion

At what pH do you think acids become too dangerous to touch? Basis? Explain your answers.

How do endothermic processes differ from exothermic processes

Before a race, an athlete warms up by jogging around the track shown below at a constant rate of 2.3 m/s. What statement best describes his motion as he jogs around the curved part of the track?