Question

1. painting a piece of paper is an example of...
2. melting, vaporization, condensation, and freezing are all examples of...
3. sodium being very reactive is an example of...
4. burning leaves is an example of...
5. vinegar reacting with baking soda is an example of...
6. acidity, reactivity, and toxicity are examples of...
7. a reaction that makes a new substance is an example of...
8. cracking a mirror is an example of...
9. an apple rotting is an example of...
10. an object changes to a different state of this is called a...

(columns: physical property, chemical property, physical change, chemical change with color labels)

Explanation:

To solve these problems, we analyze each scenario to determine if it involves a physical property, chemical property, physical change, or chemical change:

15. Painting a piece of paper

• Physical change: Painting changes the appearance (color) but not the substance’s chemical identity.
• Answer: Physical change (matches the circled "Physical change" column, e.g., "Physical change (green)").

16. Melting, dissolving, condensing, freezing

• Physical change: These processes involve state changes or mixing without new substances.
• Answer: Physical change (matches "Physical change (pink)").

17. Sodium being very reactive

• Chemical property: Reactivity describes how a substance reacts chemically (e.g., with other substances).
• Answer: Chemical property (matches "Chemical property (twirl)").

18. Burning leaves

• Chemical change: Burning (combustion) produces new substances (ash, gases).
• Answer: Chemical change (matches "Chemical change (blue)").

19. Vinegar + baking soda reaction

• Chemical change: This reaction (acid-base) produces new substances (CO₂, salt, water).
• Answer: Chemical change (matches "Chemical change (red)").

20. Acidity, reactivity, toxicity

• Chemical properties: These describe a substance’s chemical behavior (how it interacts chemically).
• Answer: Chemical property (matches "Chemical property (light green)").

21. Reaction making a new substance

• Chemical change: By definition, a reaction forming a new substance is a chemical change.
• Answer: Chemical change (matches "Chemical change (orange)").

22. Cracking a mirror

• Physical change: Cracking breaks the mirror (physical structure) but no new substance is formed.
• Answer: Physical change (matches "Physical change (light green)").

23. An apple rotting

• Chemical change: Rotting involves decomposition (new substances like mold, CO₂ form).
• Answer: Chemical change (matches "Chemical change (light blue)").

24. Changing state (e.g., solid→liquid)

• Physical change: State changes (melting, freezing, etc.) are physical (no new substance).
• Answer: Physical change (matches "Physical change (dark blue)").

Each answer aligns with the circled columns in the provided table, distinguishing between physical/chemical properties (descriptions of a substance) and physical/chemical changes (processes that do/do not form new substances).

Answer:

To solve these problems, we analyze each scenario to determine if it involves a physical property, chemical property, physical change, or chemical change:

15. Painting a piece of paper

• Physical change: Painting changes the appearance (color) but not the substance’s chemical identity.
• Answer: Physical change (matches the circled "Physical change" column, e.g., "Physical change (green)").

16. Melting, dissolving, condensing, freezing

• Physical change: These processes involve state changes or mixing without new substances.
• Answer: Physical change (matches "Physical change (pink)").

17. Sodium being very reactive

• Chemical property: Reactivity describes how a substance reacts chemically (e.g., with other substances).
• Answer: Chemical property (matches "Chemical property (twirl)").

18. Burning leaves

• Chemical change: Burning (combustion) produces new substances (ash, gases).
• Answer: Chemical change (matches "Chemical change (blue)").

19. Vinegar + baking soda reaction

• Chemical change: This reaction (acid-base) produces new substances (CO₂, salt, water).
• Answer: Chemical change (matches "Chemical change (red)").

20. Acidity, reactivity, toxicity

• Chemical properties: These describe a substance’s chemical behavior (how it interacts chemically).
• Answer: Chemical property (matches "Chemical property (light green)").

21. Reaction making a new substance

• Chemical change: By definition, a reaction forming a new substance is a chemical change.
• Answer: Chemical change (matches "Chemical change (orange)").

22. Cracking a mirror

• Physical change: Cracking breaks the mirror (physical structure) but no new substance is formed.
• Answer: Physical change (matches "Physical change (light green)").

23. An apple rotting

• Chemical change: Rotting involves decomposition (new substances like mold, CO₂ form).
• Answer: Chemical change (matches "Chemical change (light blue)").

24. Changing state (e.g., solid→liquid)

• Physical change: State changes (melting, freezing, etc.) are physical (no new substance).
• Answer: Physical change (matches "Physical change (dark blue)").

Each answer aligns with the circled columns in the provided table, distinguishing between physical/chemical properties (descriptions of a substance) and physical/chemical changes (processes that do/do not form new substances).