At 685 mmhg pressure and 50°c, a gas has a volume of 5.35 l. if the volume of the container decreases to 1.25 l, what is the amount of the pressure change?

The amount of the pressure change is 2,246.8 mmHg.

Explanation:

In order to determine change in pressure we have to find the pressure of the gas when it occupied 1.25 L of volume.

So,to calculate the new pressure, we use the equation given by Boyle's law.

This law states that pressure is directly proportional to the volume of the gas at constant temperature.  

The equation given by this law is:

(at constant temperature)

where,

are initial pressure and volume.

are final pressure and volume.

We are given:

Putting values in above equation, we get:

The amount of the pressure change =

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.