Convert 4.5 hours to seconds

An unknown radioactive substance has a half-life of 3.20 hours. If 16.5 g of the substance is currently present, what mass A0 was present 8.00 hours ago

How can you tell isotopes of the same element apart?

What volume of a 0.12 m koh solution is needed to react with 23. ml of 0.22 m hcl? the reaction is: koh (aq) + hcl (aq) → kcl (aq) + h2o (l) ?

You perform an experiment producing 15.5 grams of calcium carbonate. If the theoretical yield of the reaction is 18.8 grams, then what is the percent yield

Why does the body of the bird covered with feathers?

chromium can combine with chlorine to from corneum chloride which equation is a correct representation of this reaction

What is the atomic weight of a hypothetical element consisting of two isotopes, one with mass = 64.23 amu (26.0%), and one with mass = 65.32 amu? (a) 65.3 amu (b) 64.4 amu (c) 64.9 amu (d) 65.0 amu (e) 64.8 amu

Is this base a physical or chemical property?

Classify each of the following aqueous solutions as a nonelectrolyte, weak electrolyte, or strong electrolyte. a) LiClO4 b) HClO c) CH3CH2CH2OH d) HClO3 e) CuSO4 f) C12H22O11

Give examples of temporaty physical change