A sample of iodine-131 has an activity of 200 mCi. If the half-life of iodine-131 is 8.0 days, what activity is observed after 16 days? 0.5 half lives
Step [1]: Determine the number of half lives.
x 128
5.88 x10-37
mci
16 days
128 half lives
2 half lives
80 half lives
1 day
Step [2]: Find the final activity.
50.0 mci
200. mci
200. mci
(initial activity)

answer : one can design an experiment using a liquid and an additive that can be added to the liquid and observe the chemical changes in the reaction species.

one would need a beaker which is filled with a known amount of the liquid in which thermometer is placed to measure the temperature changes; after addition of the additive to the liquid solution one can note down the temperature change and find whether the reaction is endothermic or exothermic in nature. by subtracting the initial temperature value with the final temperature one can find the temperature changes.

various combinations of liquid and additive can be used. liquid in this case can be a known quantity of water and additives can be epsom salt or without epsom salt the experiment can be conducted to notice the changes. water and ice, hydrogen peroxide and dry yeast, vinegar and baking soda,etc.

air

in a tire you fill a tire with air

then a couple days later you check the air pressure in the tire

hope this mark me brainliest