Which statement is an example of a chemical change?

Question

BlackTom AI · Accepted Answer

To determine which statement represents a chemical change, I will evaluate each option in terms of whether a new substance with different properties is formed.
Option 1: 'Ice cubes are formed in the freezer.' Forming ice from water involves a change of state (liquid to solid) without altering the chemical identity of H2O. This is a physical change, not a chemical one.
Option 2: 'Water evaporates from a lake.' Evaporation is a phase change where liquid water becomes water vapor. Again, the chemical composition remains H2O, so this is a physical change.
Option 3: 'A tree is cut down in the forest.' Cutting the tree changes its size and shape but does not alter the chemical composition of the wood. It is a mechanical/physical change rather than a chemical one.
Option 4: 'A plant converts carbon dioxide into carbohydrates.' This describes a chemical reaction (photosynthesis) where CO2 and water are transformed into glucose (a carbohydrate) and oxygen, resulting in substances with different chemical formulas. This is a chemical change.
Option 5: 'Confetti is cut from pieces of paper.' Cutting paper physically changes its size and shape but does not change the material’s chemical identity; it is a physical change.
In summary, only the statement about a plant converting carbon dioxide into carbohydrates involves forming new substances with different chemical properties, which characterizes a chemical change.

11:375:101:01 INTRO ENV SCIENCE Exam #1

Which statement is an example of a chemical change?

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