Properties and Changes of Matter
Students often see properties and changes of matter as a cluster of new terms. A steadier route is to connect Physical property with Chemical property, then place Physical change and Chemical change into the same working picture.
Definition: Matter can be described by physical properties such as state, density, color, and melting point and by chemical properties such as reactivity. A physical change alters form or state without creating a new substance. A chemical change rearranges atoms and produces substances with new compositions.
What do you need to know about properties and changes of matter?
Use the visual as a recall tool: read the Physical property box, cover it, and explain it from memory. Repeat that move for Chemical property, Physical change, and Chemical change; then explain how the four ideas connect.
What should you remember about properties and changes of matter?
| Idea | What it means |
|---|---|
| Physical property | A characteristic observed without changing the substance's chemical identity. |
| Chemical property | A substance's ability to undergo a chemical change. |
| Physical change | A change in size, shape, or state that preserves chemical identity. |
| Chemical change | A process that produces one or more substances with new compositions. |
How can each anchor help you answer a question?
Physical property as a question clue
A characteristic observed without changing the substance's chemical identity. A useful contrast is chemical property: a substance's ability to undergo a chemical change.
Chemical property as a question clue
A substance's ability to undergo a chemical change. A useful contrast is physical change: a change in size, shape, or state that preserves chemical identity.
Physical change as a question clue
A change in size, shape, or state that preserves chemical identity. A useful contrast is chemical change: a process that produces one or more substances with new compositions.
Chemical change as a question clue
A process that produces one or more substances with new compositions. A useful contrast is physical property: a characteristic observed without changing the substance's chemical identity.
What else helps this topic make sense?
Intensive properties do not depend on sample amount, while extensive properties do. Density, boiling point, and color can help identify a substance because a larger sample has the same characteristic value under the same conditions. Mass and volume increase when the amount increases. This distinction is useful in identification questions: choose a property that remains characteristic of the material instead of one that merely describes how much was collected.
How does this idea work in a real question?
Melting ice changes solid water into liquid water, so the molecules remain water and the change is physical. Rusting iron forms iron oxides with different compositions and properties, so rusting is chemical.
For this example, first identify which of the four anchors is changing or acting. Follow its effect through the situation and name the result before comparing choices. This keeps your reasoning tied to evidence rather than to a familiar-looking term.
What is a reliable way to reason through it?
- Decide whether the question is mainly about Physical property, Chemical property, Physical change, or Chemical change.
- Restate the job of the named idea before reading the answer choices.
- Use the Physical property–Chemical change map above to trace direction, cause, evidence, or outcome in the order supplied.
- Test the remaining choice against this specific warning: A dramatic appearance does not prove a chemical change. Boiling creates bubbles and large motion but is a physical state change when no new substance forms.
What mistake should you watch for?
A dramatic appearance does not prove a chemical change. Boiling creates bubbles and large motion but is a physical state change when no new substance forms.
If two choices survive, ask which one preserves the stated relationship between Physical property and Chemical property. Then check it against Physical change or Chemical change if either appears in the prompt.
Watch a short lesson
The properties-and-changes video compares physical evidence with chemical identity, matching the central distinction in this lesson. Pause the lesson when a diagram or process appears and connect it with the four anchors in this page’s visual.
Can you check your understanding?
Try these six checks from memory. Open an answer only after you have said or written your own response.
In your own words, what is the central idea in this lesson?
Check the answer
Matter can be described by physical properties such as state, density, color, and melting point and by chemical properties such as reactivity. A physical change alters form or state without creating a new substance. A chemical change rearranges atoms and produces substances with new compositions.
What should you remember about physical property?
Check the answer
A characteristic observed without changing the substance's chemical identity.
What should you remember about chemical property?
Check the answer
A substance's ability to undergo a chemical change.
What should you remember about physical change?
Check the answer
A change in size, shape, or state that preserves chemical identity.
What should you remember about chemical change?
Check the answer
A process that produces one or more substances with new compositions.
What final check is most useful for a question about properties and changes of matter?
Check the answer
Compare the choice with the relationship among Physical property, Chemical property, Physical change, and Chemical change. Then apply this warning: A dramatic appearance does not prove a chemical change. Boiling creates bubbles and large motion but is a physical state change when no new substance forms.
Where does this fit in your science review?
The ATI TEAS Science Study Hub places this lesson inside the larger chemistry review. Continue with these connected lessons:
- Atoms, Elements, and the Periodic Table
- Chemical Bonds and Compounds
- Chemical Reactions and Equations
- Factors That Affect Reaction Rates
Recommended ATI TEAS resources
Keep this chemistry lesson in your science sequence. When you are ready to work on the mathematics section of the same exam, the resources below provide a separate set of lessons and practice.
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