Three examples of physical change are ____. (1 point)
boiling water, a nail rusting, and a melting candle
a pond freezing, breaking glass, and a burning candle
melting ice, mowing the lawn, and carving a statue
applying lipstick, making lemonade, and baking bread
applying lipstick, making lemonade, and baking bread
The correct answer is: melting ice, mowing the lawn, and carving a statue.
To identify examples of physical changes, we need to understand the definition of a physical change. A physical change refers to a change in the physical properties of a substance without altering its chemical composition. In other words, the substance remains the same, but its form or state may change.
Let's go through each option to determine which ones demonstrate physical changes:
Option 1: Boiling water, a nail rusting, and a melting candle - Boiling water is a physical change because the water changes from a liquid to a gas without any chemical composition changes. A nail rusting, however, is a chemical change as it involves a reaction between iron and oxygen in the air. The melting candle can be considered a physical change as the solid wax changes into a liquid state.
Option 2: A pond freezing, breaking glass, and a burning candle - A pond freezing is a physical change as the water changes from a liquid to a solid without any chemical composition changes. Breaking glass, on the other hand, is also a physical change as it only affects the physical properties of the glass but does not alter its chemical structure. Lastly, a burning candle is a chemical change as it involves the wax reacting with oxygen to produce carbon dioxide, water vapor, and heat.
Option 3: Melting ice, mowing the lawn, and carving a statue - Melting ice is a physical change as the solid ice changes into a liquid without any chemical alterations. Mowing the lawn is also a physical change since it involves cutting the grass, altering its physical appearance, but not its chemical composition. Lastly, carving a statue is a physical change as it involves shaping a piece of material without changing its chemical structure.
Option 4: Applying lipstick, making lemonade, and baking bread - Applying lipstick is considered a physical change as it alters the appearance of the lips without any chemical composition changes. Making lemonade, though, is both a physical and chemical change. Physically, it involves mixing lemon juice, water, and sugar. Chemically, the acids in the lemon juice react with the sugar to create a new substance called citric acid. Baking bread is also a chemical change as it involves the process of combining ingredients, such as flour and yeast, resulting in a chemical reaction that produces carbon dioxide, causing the dough to rise.
Therefore, the correct answer is melting ice, mowing the lawn, and carving a statue. These examples represent physical changes as they involve alterations in the physical properties of substances without changing their chemical composition.