5. After undergoing 4 half-lifes what % of a 150 g sample of I-L-L will remain?

6.25%

Explanation:

Given data:

Total sample = 150 g

Percentage remain after 4 half life = ?

Solution:

at time zero 150 g

At first half life = 150 g/2 = 75 g

At 2nd half life = 75 g/ 2 = 37.5 g

At 3rd half life = 37.5 g/2 = 18.75 g

At 3rd half life = 18.75 g/2 = 9.375 g

Percentage remain after 4 half lives.

9.375 g / 150 g × 100

0.0625 × 100

6.25%

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.