Now let's say you are in charge of catering for a business lunch that 150 people will be attending. You want to order trays of small sandwiches, and
you assume that each person will eat 2 small sandwiches. You know that
each tray will have 60 sandwiches. How many trays do you need to order?
Show your work.

lithosphere and asthenosphere

the correct answer would be d. hope this !

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.