Question

Which describes how chemical changes are different from physical changes? (2 points) Group of answer choices Chemical changes can be measured, but physical changes cannot. Chemical changes release energy, but physical changes absorb energy. Chemical changes involve the formation of a new substance. Chemical changes cannot be caused by oxygen.

Answer 1

Answer: Both Chemical and physical changes can be measured, chemical changes can be caused by oxygen since its very reactive. Physical Change: There is no addition or deduction of energy during the physical change, but the energy required for completion of change is released when the change is reversed. Chemical Change: Energy like light, pressure, heat energy is required for chemical changes. When physical or chemical changes occur, they are generally accompanied by a transfer of energy. The law of conservation of energy states that in any physical or chemical process, energy is neither created nor destroyed.

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