Mr torres is in charge of the school music assembly. the assembly is 80 minutes in length and contains music from 4 different ensembles. he would like less than 19 minutes of “down time” the amount of time the ensembles are not performing, including the time it takes each ensembles to get on and off the stage. each ensemble will have the same amount of time to perform, and the time will be in whole-number minutes. write and equation to solve this problem

6.4 cm (max) - 25 cm (min)

a electronegativity decreases beacuse the size of nucleus is bigger.

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.