A sample of phosphorus-32 has a half-life of 14.28 days. If 55 g of this radioisotope remain unchanged after approximately 57 days, what was the mass of the original sample?

Determine the oxidation state of the metal ion in [cr (h2o) 6]3+.

Reacts with air ... physical or chemical property; )

Which equation expresses newton's 2nd law of motion

Write a complete, balanced equation for this double displacement reaction between sodium hydroxide and nickel (ii) chloride. (hint: the solid is a compound of ni2 + ions and hydroxide ions.

What is the molarity of a 10.2 % by mass glucose (c6h12o6) solution? (the density of the solution is 1.03 g/ml.) ?

What kind or plate tectonic boundary is the san anfreas fault?

Which city's climate is most similar to Jakarta, Baltimore or Kuala Lumpur? Data Table Shanghai, China (31° N, 121° E) Baltimore City, USA (39° N, 76° W) Helsinki, Finland (60° N, 24° E) Banff, Canada (51° N, 115° W) Kuala Lumpur, Malaysia (3° N

State four uses of protein in human body?

If a particular ore contains 55.1 % calcium phosphate, what minimum mass of the ore must be processed to obtain 1.00 kg of phosphorus? Express your answer with the appropriate units.

Which best describes thermal energy? It is the difference between internal energies of two or more substances It is the sum of internal energies of two or more substances O It is the portion of internal energy that can be transferred from one