The task in the image appears to be about identifying whether each process or action represents a
physical change or a
chemical change. Here's a breakdown of the solution:
Definitions:
-
Physical Change: A change in which the physical properties (e.g., shape, size, state) of a substance are altered, but its chemical composition remains the same.
-
Chemical Change: A change in which the chemical composition of a substance is altered, resulting in the formation of new substances.
Analysis of Each Item:
#### Top Row:
1.
Cut apple: Physical change (shape changes, but no new substance is formed).
2.
Baking cookie: Chemical change (new substances form due to heat and chemical reactions).
3.
Lit match: Chemical change (burning involves combustion, forming new substances like carbon dioxide and water).
4.
Melting ice: Physical change (state changes from solid to liquid, but the substance remains water).
5.
Toasting marshmallow: Chemical change (browning involves chemical reactions, forming new compounds).
#### Second Row:
6.
Freezing water: Physical change (state changes from liquid to solid, but the substance remains water).
7.
Flickering flame: Chemical change (combustion involves chemical reactions).
8.
Dissolving sugar: Physical change (sugar dissolves in a solvent, but no new substance is formed).
9.
Torn paper: Physical change (shape changes, but no new substance is formed).
10.
Sliced bread: Physical change (shape changes, but no new substance is formed).
#### Third Row:
11.
Boiling water: Physical change (state changes from liquid to gas, but the substance remains water).
12.
Crushed can: Physical change (shape changes, but no new substance is formed).
13.
Broken mirror: Physical change (shape changes, but no new substance is formed).
14.
Decaying leaf: Chemical change (decomposition involves chemical reactions, forming new substances).
15.
Frying egg: Chemical change (heat causes proteins to denature and form new structures).
#### Bottom Row:
16.
Vinegar + baking soda: Chemical change (reaction produces carbon dioxide gas and other new substances).
17.
Rusting bicycle: Chemical change (rusting involves oxidation, forming iron oxide as a new substance).
18.
Burning wood: Chemical change (combustion involves chemical reactions, forming new substances like carbon dioxide and water).
19.
Cut grass: Physical change (shape changes, but no new substance is formed).
20.
Melting candle: Physical change (state changes from solid to liquid, but the substance remains wax).
Final Answer:
-
Physical Changes: Cut apple, Melting ice, Torn paper, Sliced bread, Freezing water, Boiling water, Crushed can, Broken mirror, Sliced bread, Cut grass, Melting candle.
-
Chemical Changes: Baking cookie, Lit match, Toasting marshmallow, Flickering flame, Dissolving sugar, Decaying leaf, Frying egg, Vinegar + baking soda, Rusting bicycle, Burning wood.
\boxed{\text{See detailed explanation above for each item.}}
Parent Tip: Review the logic above to help your child master the concept of physical and chemical changes worksheet for kids.
