Chemical and Physical Changes

Water is boiled and turns to vapor. The vapor is cooled and changes back into water. Which best describes what has occurred?

• a physical change, because the matter changed its state

• a chemical change, because the matter changed its state

• a physical change, because a new substance was formed

• a chemical change, because a new substance was formed

Which of the following is an example of a chemical change?

• clouds forming

• chocolate melting

• water freezing

• a candle burning

Which describes a chemical change?

• sugar dissolving in tea

• painting a wall

• scissors cutting paper into pieces

• acid in the stomach digesting food

Water is boiled and water vapor forms. Which best describes this process?

• A chemical change occurs because a completely new substance forms

• A chemical change occurs because the temperature of the water changes

• A physical change occurs because the water disappears as it is absorbed by air

• A physical change occurs because water and vapor are different states of the same substance

Mrs. Fizzle Sticks' family built a wood fire in the fireplace. The next day, Mrs. Fizzle Sticks noticed that there was no wood left in the fireplace, only ashes. Which best explains this

• Wood is separated from ashes as it burns

• Wood becomes a new substance as it burns

• Ashes have the same properties as wood

• Ashes are the same substance as wood

Which example best describes a physical change?

• iron rusting

• charcoal burning

• an ice cube melting

• a marshmallow burning

Which best explains why burning wood is a chemical change?

• The process occurs quickly

• The process can be reversed

• The process can be repeated

• The process creates a new substance

Which is an example of a change that will produce a new substance?

• A piece of wood is burned and turns to ash

• A glass jar breaks into smaller shards of glass

• A puddle of water evaporates into water vapor

• A piece of paper gets wet and is shredded apart

Which is a physical change involving an egg?

• frying an egg

• breaking an egg

• boiling an egg

• cooking an egg

Which is the best example of a change that can be undone?

• clay put in an oven to harden

• cake batter put in an oven to bake

• chocolate left in a warm car to melt

• a rusted bike