Chemistry · Matter and its nature, Dalton's atomic theory
Which of the following statements is not correct?
Which of the following statements is not correct?
- A. In a chemical change, color of the object may change.
- B. In a chemical change, heat will always be released.
- C. A chemical change always involves a physical change.
- D. Rusting of iron becomes faster when humidity is high.
Step-by-step solution
During a chemical change, heat may be either released (exothermic) or absorbed (endothermic). For example, photosynthesis is endothermic, while combustion is exothermic. Therefore, it is not always released, making option B incorrect.