A graduated cylinder has 65 mL of water at 25 oC. When 45.0 g of an unknow solid is dropped into the graduated cylinder, the liquid surface reaches a volume of 75.8 mL. What is the density of the unknown solid

4.17 g/mL

Explanation:

In order to determine the density of the solid, we need to know both its mass and its volume.

The mass is already given to us by the problem, 45.0 g.

As for the volume, we can determine it by using Archimedes' principle. It states that the volume of water displaced by an object when submerged is equal to the object's volume.

Finally we calculate the density of the solid:

the dependant variable is spilled water

the independent is the heat

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.