Classify either Physical or Chemical change:

*water freezing forming ice _____
*frying an egg _____
*dissolution of sodium chloride in water ______
*combustion of gasoline _____

To determine whether each scenario represents a physical or chemical change, we need to understand the definitions of both types of changes.

In physical changes, the substance undergoes a transformation without changing its chemical composition. It involves altering its physical properties, such as shape, size, or state of matter, without forming any new substances. Examples include changes in the state of matter (such as ice melting to water or water freezing to ice) or changes in appearance (such as tearing a piece of paper or dissolving a solid in a liquid).

In chemical changes, the substance undergoes a transformation that results in the formation of new substances with different chemical properties. This involves a rearrangement of atoms and a change in chemical composition. Examples include reactions such as combustion or decomposition, where new chemical compounds are formed.

Now, let's classify each scenario based on the provided information:

1. Water freezing forming ice:
This is a physical change. Freezing is the process of changing a substance from a liquid to a solid state. The molecules in water slow down and arrange themselves into a crystalline structure, resulting in the formation of ice. No new substances are formed, only the physical state of water changes.

2. Frying an egg:
This is a chemical change. When an egg is fried, the heat causes the proteins in the egg to denature and coagulate, resulting in the formation of completely new substances with different properties. The chemical composition of the egg changes, forming a solid and distinctively different product.

3. Dissolution of sodium chloride in water:
This is a physical change. Dissolution involves the separation of the ions of a solute (sodium chloride) when it is added to a solvent (water), resulting in a homogeneous mixture (saltwater). Although the ions of sodium chloride disperse throughout the water, no chemical reaction occurs, and no new substances are formed.

4. Combustion of gasoline:
This is a chemical change. During combustion, gasoline reacts with oxygen in the presence of a spark or heat, leading to the formation of new substances, such as carbon dioxide, water vapor, and energy in the form of heat and light. The original gasoline molecules are broken down and rearranged into different compounds.

In summary:
- Water freezing forming ice: Physical change
- Frying an egg: Chemical change
- Dissolution of sodium chloride in water: Physical change
- Combustion of gasoline: Chemical change