Answer:
the answer is 3
Explanation:
any change that omits a temperature reaction is a chemical reaction. mixing paint is a physical change as the paint itself is not effected om the chemical level.
Answer:
From the list only III) contains chemical changes:
III) Ammonium nitrate solid dissolves in water and feels very cold.
Explanation:
We have four possible situations, we need to study if they are or they are not chemical changes.
I) A pot of water is being heated on a stove. Bubbles form and condensation appears on the lid of the pot. This situation is a physical change, molecules of water are heated and due to it, they move from liquid to gas phase.
II) A translucent, blue copper (II) sulfate solution is mixed with another solution and changes to a translucent light blue color. As the color remains the same, but lighter, we can infer that this process could be a dilution process, and so only changed the concentration of the components. It is not a chemical change.
III) Ammonium nitrate solid dissolves in water and feels very cold. As a solid component is dissolved in water, we can conclude that the chemical bonds of ammonium nitrate are broken, due to it, ions are released into the solution. This is a chemical change.
IV) Red and blue paint are mixed together and the color purple appears. This is a mixture process, and it is only physical.
Finally, we can conclude only situation III) contains chemical changes.
