A one-ounce bag of Hot Cheetos has 90 calories from fat and 150 total calories.  A party size bag of hot Cheetos is 18.5 ounces.  How many calories of fat have you consumed if you eat half a bag of party-size chips?

832.5 calories

Explanation:

One ounce bag of Hot Cheetos contains 90 calories from fat and 150 total calories. Also a party size bag of hot Cheetos weigh 18.5 ounces.

Therefore the weight of half of a bag of party-size chips = Size of a party size bag of hot Cheetos / 2 = 18.5 ounces / 2 = 9.25 ounces.

Since one ounce bag of Hot Cheetos contains 90 calories from fat, the amount of fat contained in half a bag of party-size chips (9.25 ounces) is given as:

Calories of fat in half a bag of party-size = 90 calories per ounce × 9.25 ounces = 832.5 calories

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.