Which of the following could result from a substance that undergoes a physical change?

Its chemical composition is altered.
It has an irreversible change.
It forms a new substance.
Its shape is altered.

Question

Which of the following could result from a substance that undergoes a physical change?

Its chemical composition is altered.
 It has an irreversible change.
 It forms a new substance.
 Its shape is altered.

kekeman · Answer

Help please

SmokeyBrown · Answer

Physical changes are different from chemical changes in several important ways. To use a simple example, consider the difference between burning a piece of paper (chemical) versus tearing it into pieces (physical). The following is true of each case:
chemical changes change the chemical composition of a substance, while physical changes do not;
chemical changes are not easily reversible, while physical changes usually are;
chemical changes can convert a substance into a different substance, while physical changes do not

Based on that information, which option do you think would be true of a physical change?

kekeman · Answer

@smokeybrown wrote:

Physical changes are different from chemical changes in several important ways. To use a simple example, consider the difference between burning a piece of paper (chemical) versus tearing it into pieces (physical). The following is true of each case: chemical changes change the chemical composition of a substance, while physical changes do not; chemical changes are not easily reversible, while physical changes usually are; chemical changes can convert a substance into a different substance, while physical changes do not Based on that information, which option do you think would be true of a physical change?

I feel like it would be "Its shape is altered."