Question

Which describes a chemical change? (Select all that apply.)

A new substance is created.

It can be a physical change.

It is a permanent change.

A phase change is occurring.

Answer 1

A chemical change is characterized by the following:

- **A new substance is created.** (This is a defining feature of a chemical change.)

- **It is a permanent change.** (Chemical changes usually result in substances that are different from the original and cannot easily revert back to the original state.)

The other two options do not describe chemical changes:

- **It can be a physical change.** (This describes a physical change, not a chemical change.)

- **A phase change is occurring.** (This describes a physical change, such as changes between solid, liquid, and gas states, not a chemical change.)

So, the correct answers are:
- A new substance is created.
- It is a permanent change.