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In your lab group you combined salt and water. Then you compared what happens when an egg is placed in tap water versus salt water. You observed that the egg floated in the salt water, but sank on the fresh water. You and your lab partner discuss the cause of this difference and wonder if the combining of the salt and water caused a physical or chemical change. Choose ALL of the evidence that supports that a physical change has occured.

A) A gas was produced.
B) The density changed.
C) The salt dissolved in the water.
D) The salt and the water cannot be separated into their individual molecules.
E) The salt and the water can still be separated into their individual molecules.

A physical change is a change that occurs in a substance which affects only the physical properties of that substance such as color, density, boiling o melting point, etc. In a physical change, the substance retains its chemical composition and no new substances are formed. The changes that occur can as well be reversed.

A chemical change is a change that occurs in a compound which affects or alters the chemical properties of that substance, hence transforming the substance into an entirely new substance different from the original substance. The changes that occur in a chemical change are not easily reversible.

In the given experiment, addition of salt to water results in the following changes:

The salt dissolves in the water;
The density of water increases due to the dissolution of salt in it;
The salt and water molecules can be easily separated into their individual molecules

Density is a physical property of a substance, and as the dissolved salt can be easily recovered from the salt solution solution by evaporation followed by condensation, the changes observed are physical changes.