EdPuzzle Chemical Changes

What defines a physical change in a substance?

• A change where a new substance is created.

• A change in the size, shape, or state of matter without creating a new substance.

• A change that always produces a new smell.

• A change that always releases gas.

What type of change occurs when an ice cube melts into a puddle of water?

• A chemical change, because the state of matter changes.

• A physical change, because no new substance is created.

• A chemical change, because heat is absorbed.

• Neither, as it's a permanent alteration.

What is the primary characteristic of a chemical change?

• The substance changes its physical state (solid to liquid, etc.).

• The substance changes its size or shape.

• One kind of matter changes into a different kind of matter.

• The substance becomes colder.

When paper is burned, turning into ash and smoke, what type of change is occurring?

• A physical change, because the paper's shape is altered.

• A chemical change, because new substances (ash and smoke) are created.

• A physical change, because the temperature changes.

• Neither, as it's a reversible process.