Indicate the order of reaction consistent with each observation.
a. The half-life of the reaction gets shorter as the initial concentration is incr eased.
b. A plot of the natural Jog of the concentration of the reactant versus time yields a straight line.
c. The half-life of the reaction gets longer as the initial concentration is in creased.

a. Second order

b. First order

c. zero order

Explanation:

a. For a second order reaction,

As half life is inversely proportional to initial concentration, therefore, increase in intital concentration will decrease half life of the reaction.

b. First order reaction,

for first order reaction:

y = C + mx

Therefore, plot between ln A and  t is a straight line.

c. For a zero order reaction,

Half life is proportional to initial concentration, therefore, increase in initial concentration will increase half life of the reaction.

water is used to store them because it would keep the radiation from getting out in the open and causing harm to the workers

answer is: c. the experiment shows that the red substance experienced a chemical change.

this is chemical change (chemical reaction), because two new substances are formed (metalig liquid and gas), the atoms are rearranged and the reaction is followed by an energy change.

this is example of chemical decomposition.

chemical decomposition (analysis) is the separation of a single chemical compound into its two or more elemental parts or to simpler compounds.  

chemical decomposition is opposite of chemical synthesis.