Podcast
Questions and Answers
Give an example of a physical change that can be reversed and one that cannot be reversed.
Give an example of a physical change that can be reversed and one that cannot be reversed.
Reversible: Braiding your hair; Non-reversible: Cutting your hair.
List 3 examples of physical properties.
List 3 examples of physical properties.
Malleability, hardness, and change in color.
How do you know if a chemical change has occurred?
How do you know if a chemical change has occurred?
A new substance is formed, a precipitate appears, or a gas is produced.
Give two examples of chemical properties.
Give two examples of chemical properties.
Signup and view all the answers
What kind of change occurs when a substance changes from one state to another state of matter?
What kind of change occurs when a substance changes from one state to another state of matter?
Signup and view all the answers
If atoms combine to form a compound, what type of change has occurred?
If atoms combine to form a compound, what type of change has occurred?
Signup and view all the answers
A pat of butter melts and then burns in a hot frying pan. Which of these changes is physical and which is chemical?
A pat of butter melts and then burns in a hot frying pan. Which of these changes is physical and which is chemical?
Signup and view all the answers
Define chemical change and physical change.
Define chemical change and physical change.
Signup and view all the answers
Study Notes
Physical Changes
- Reversible Change: Example is braiding hair, which can be undone.
- Irreversible Change: Example is cutting hair, which cannot be restored.
Physical Properties
- Properties to consider include:
- Malleability: Ability of a material to be shaped or bent without breaking.
- Hardness: Resistance of a material to deformation or scratching.
- Change in Color: Observable alteration indicating a physical property may have changed.
Chemical Changes
- Indicators of a chemical change:
- Formation of a new substance.
- Production of a precipitate (solid that forms from a solution).
- Release of gas during the reaction.
Chemical Properties
- Key properties include:
- Reactivity: How a substance interacts with others, which can change its chemical structure.
- Flammability: The ability of a substance to ignite and burn in the presence of an ignition source.
State Changes
- A change from one state to another (solid, liquid, gas) is classified as a physical change.
Formation of Compounds
- Chemical Change: Occurs when atoms combine to create a new compound, changing the original substances at a molecular level.
Example of Dual Changes
- Melting and burning butter:
- Physical Change: Melting of butter as it retains its substance.
- Chemical Change: Burning of butter that produces new substances.
Definitions
- Physical Change: A change in which some properties may alter, but the substance remains unchanged.
- Chemical Change: A process where a substance undergoes a transformation, resulting in a new substance being formed.
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
Description
Test your understanding of physical changes and properties in Chapter 2 with these flashcards. Explore examples of reversible and irreversible changes, physical properties, and signs of chemical changes. Perfect for quick revision and self-assessment.
