Data:
m = 7 g
ΔT = 19 °C
Cs of water = 1 cal / g °C
Formula Q = m * Cs * ΔT
Solution:
Q = (7 g) * (1 cal / g °C) * ( 19°C) = 133 cal
Not enough information.
To be able to find mols I use the equation M= n/V and I do not have the concentration / M
Answer:
c. 3.
Explanation:
pOH = -log(1x10^-11)
14-11 = 3 (pOH + pH = 14)
- Hope that helps! Please let me know if you need further explanation.
Answer: the time it takes for one-half of the sample to decay.
Explanation:
Half life is the amount of time taken by a radioactive material to decay to half of its original value.
Radioactive decay process is a type of process in which a less stable nuclei decomposes to a stable nuclei by releasing some radiations or particles like alpha, beta particles or gamma-radiations. The radioactive decay follows first order kinetics.
Half life is represented by
= rate constant
Thus the half-life of a radioisotope is the time it takes for one-half of the sample to decay.