Question

1. choose all that apply. which two facts are about a chemical change? the change cannot be reversed. it is usually possible to change the substance back. the substance changes size or shape but remains the same substance. the change results in a new substance.

Explanation:

A chemical change results in the formation of a new substance through a chemical reaction. Chemical changes are usually irreversible as the chemical bonds are broken and new ones are formed. Changing size or shape is a physical change. Reversing a chemical - change is difficult as it would require a different set of chemical reactions to break the newly formed bonds and reform the original ones.

Answer:

The change results in a new substance.
The change cannot be reversed.