Physical & Chemical Changes

Gloria’s family built a wood fire in the fireplace. The next day, Gloria 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.

Susan is completing an experiment in science. She mixes 1 cup of hot water with 2 cups of salt. What will most likelyhappen to the substances?

• The substances will blend and their properties will be changed.

• The substances will not blend and their properties will be changed.

• The substances blend and form another liquid that appears as a solid.

• The substances will not blend and their properties will be the same as the individual substances.

Ramano is burning wood in a bonfire. What change is occurring during the fire?

• The wood is gaining more mass.

• The wood is changing into a liquid.

• The wood is dissolving into the ground.

• The wood is releasing a gas as smoke.

Which best explains what happens to the inside of an egg when it is boiled?

• The liquid becomes solid.

• The solid becomes gas.

• The solid becomes liquid.

• The liquid becomes a gas.

One type of remedy for colds is an effervescent pill that melts in water. By placing the tablet in the water, it forms gas bubbles. In this example, the formation of a gas

• It is a physical property

• It is a sign of a chemical change

• It happens when you add water to the acid

• It happens when the water boils

Which option describes a chemical change?

• The dissolution of sugar in tea

• sunlight heating the sidewalk

• the scissors cutting a piece of paper into pieces

• the acid in the stomach digesting the food

Over time, iron oxidizes when combined with water and oxygen. What type of change must occur in order for the oxide to form?

• the chemical change

• the mechanical change

• the nuclear change

• the physical change

Which example best describe a physical change?

• baking a pie

• burning a candle

• making a paper airplane

• frying an egg

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

• clay put into an oven to harden

• cake batter put in an oven to bake

• chocolate left in a warm car to melt

Which best explains why melting ice is a physical change instead of a chemical change?

• It does not smell bad

• It changes from a solid to a liquid

• It does not form a new substance

• It changes quietly with no loud sound