a 182.4g sample of germanium-66 is left undisturbed for 22.5 hours. At the end of

Approximately .

Explanation:

Calculate the ratio between the mass of this sample after and the initial mass:

.

Let denote the number of half-lives in that (where might not necessarily be an integer.) The mass of the sample is supposed to become the previous quantity after each half-life. Therefore, if the initial mass of the sample is (for example,) the mass of the sample after half-lives would be . Regardless of the initial mass, the ratio between the mass of the sample after half-lives and the initial mass should be .

For this question:

.

Take the natural logarithm of both sides of this equation to solve for :

.

.

.

In other words, there are half-lives of this sample in . If the length of each half-life is constant, that length should be .

Explanation:

1. Increasing the concentrations of reactants in a chemical reaction would affect a reaction positively by increasing the number of collisions within a particular period which in turn increases the rate of reaction.

2. The molecules gains energy,which enable them to move faster and collide with the right energy for a reaction to take place.

3. The average kinetic motion of molecules in a solution can be measured by measuring the temperature. Temperature is a measure of the average kinetic energy of molecules in a solution.