Question
Which statement best describes what happens during a chemical change? Both the identity and the properties of a substance change. Some properties of a substance charige, but its identity remains the same. The chemical properties of a substance change, but its physical properties remain the same. The physical properties of a substance change, but its chemical properties remain the same.
Answer
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Tobias
Elite · Tutor for 8 years
Answer
'Both the identity and the properties of a substance change.'
Explanation
## Step 1To solve this problem, we need to understand the difference between a chemical change and a physical change. ### A chemical change involves a substance transforming into a different substance with different chemical properties. This is due to a change in the molecular or atomic structure during a reaction. For example, when iron rusts, it combines with oxygen to form iron oxide, a different substance with different properties than iron.### A physical change, on the other hand, involves a change in the physical properties of a substance, but not its chemical identity. For example, when water freezes into ice, it changes physically (from liquid to solid), but it remains H₂O, retaining its chemical identity.## Step 2Now, let's analyze the given options:- "Both the identity and the properties of a substance change." This statement accurately describes a chemical change. The substance undergoes a chemical reaction, resulting in a new substance with different chemical properties.- "Some properties of a substance change, but its identity remains the same." This statement is more indicative of a physical change, where the substance may change form or state, but its chemical composition remains unchanged.- "The chemical properties of a substance change, but its physical properties remain the same." This option is contradictory because a change in chemical properties inherently implies a change in the substance itself, which would also affect its physical properties.- "The physical properties of a substance change, but its chemical properties remain the same." This statement describes a physical change, not a chemical change.## Step 3Therefore, the statement that best describes what happens during a chemical change is the one that mentions both the identity and the properties of a substance changing.#