Determining the activity of the sample
A pure sample of 226 Ra includes 2.0 x 10^14 atoms of the isotope. When the half-life of 226 Ra = 1.6 x 10^3 years, determine the activity of the sample?
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A proton traveling at 27.8° with respect to the direction of the magnetic field of strength 3.57 mT undergoes a magnetic force of around 9.24 x 10-17 N. Compute (i) the speed of proton and (ii) its kinetic energy (in eV).
Determine how many milligrams of iodine will sublime into an evacuated 1.00-L flash? What will the final pressure be when 2.0 mg of I2 is used?
What is the standard molar internal energy of formation of NH3 (g) when the standard molar enthalpy of formation of NH3 (g) is -46.11 kJ/mol.
A disk rotates having constant angular acceleration. The initial angular speed of the disk is around 2p rad/s. After the disk rotates via 13p radians, the angular speed is around 9p rad/s. (i) Determine the magnitude of the angular acceleration?
Explain why is it important that a chemical equation be balanced? Explain when balancing a chemical equation, can you adjust the number that has been subscripted to a substance?
Suppose the probability of the boy being born is same as probability of the girl being born. Determine probability that family with 5 children will have girls as two oldest children.
Write down the net equation for the formation of precipitate when the following sets of solutions are mixed. Calcium chloride & ammonium phosphate
You want to accelerate a small merry-go-round from rest to the rotational speed of one-fourth of a revolution per second by pushing tangentially on it.
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