Final answer:
Chemical changes result in the creation of new substances with different properties due to the making or breaking of bonds, while physical changes alter the form or appearance without changing the chemical identity. Dissolving sugar in water is a physical change, while effervescence typically suggests a chemical change. However, based on the information provided, options 1, 2, and 3 seem plausible, while option 4 is closely related to effervescence and the release of a gas, which could occur in both chemical and physical changes.
Step-by-step explanation:
Understanding Chemical and Physical Changes
When distinguishing between chemical changes and physical changes, it's essential to consider the properties and the identity of the substance after the change.
A chemical change involves making or breaking of bonds between atoms, and the creation of new substances with different properties.
On the other hand, a physical change alters the form or appearance of a substance without changing its chemical identity.
Let's examine some examples:
Condensation of steam is a physical change as it converts water from gas to liquid while maintaining its molecular structure as H2O.
Burning of gasoline is a chemical change as it involves a reaction with oxygen that produces new substances like carbon dioxide and water vapor.
Souring of milk is a chemical change due to the production of lactic acid and the alteration of milk proteins.
Dissolving sugar in water is considered a physical change since the sugar molecules do not chemically react with water and can be recovered upon evaporation.
Melting of gold is a physical change as gold transitions from solid to liquid while still remaining gold in terms of composition.
When assessing changes in a picture that could potentially be illustrating effervescence or the release of a dissolved gas, it suggests a chemical change as new gas is forming from a liquid solution, which is often accompanied by bubbling or fizzing — a characteristic sign of a chemical reaction.
However, based on the information provided, options 1, 2, and 3 seem plausible, while option 4 is closely related to effervescence and the release of a gas, which could occur in both chemical and physical changes.