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 occurred.
1. The egg's behavior changed when placed in the salt water compared to the tap water.
2. The salt dissolved in the water to create a uniform solution.
3. The egg retained its original properties of size, shape, and color after being removed from the salt water.
4. The addition of the salt did not alter the chemical composition of the water or the egg.