Sealed 2500 flask is full to capacity with 0.36 g of a substance. determine density of the substance. guess if the substance is a gas liquid or solid.

0.000144gcm⁻³

Explanation:

Given parameters:

Volume of flask = 2500mL

Mass of substance = 0.36g

Solution:

Density is the mass per unit volume of a substance. The flask used to determine the density of the substance will have a volume of 2500mL if equal amount of water is added to it.

Now, we must convert the given volume to that which would be more convenient to work with.

Density can be expressed as gcm⁻³ or kgm⁻³.

We have to convert the given volume to cubic centimeters.

           1mL = 1cm³

The volume of the flask in cubic centimeters is 2500cm³.

Density = =  

Density of the substance = 0.000144gcm⁻³

The substance is probably a gas. The density of water is 1gcm⁻³. Any value far below this should be a gas. Our answer is a very low density value.

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.