Understanding Changes in Matter

What is an example of a physical change?

• Melting ice into water

• Freezing water into ice

• Burning wood to ash

• Dissolving sugar in water

Is melting ice a physical or chemical change?

• Sublimation process

• Physical change

• No change at all

• Chemical change

What happens to paper when it is torn?

• The paper turns into dust.

• The paper becomes smaller in size.

• The paper is separated into two or more pieces.

• The paper remains intact and unchanged.

Is rusting of iron a physical or chemical change?

• No change at all

• Temporary change

• Physical change

• Chemical change

What is an example of a chemical change?

• Boiling water

• Melting of ice

• Rusting of iron

• Dissolving sugar in water

What happens when vinegar is mixed with baking soda?

• A neutralization reaction occurs, producing salt and vinegar.

• No reaction occurs, and the substances remain unchanged.

• A chemical reaction occurs, producing carbon dioxide gas, water, and sodium acetate.

• The mixture creates a flammable gas that can explode.

How can you tell a physical change has occurred?

• A physical change has occurred when there is a change in appearance or state without a change in chemical composition.

• A physical change occurs when a substance is transformed into a different chemical compound.

• A physical change can be identified by the release of gas or a change in color.

• A physical change is indicated by a change in temperature without any visible alteration.

What is the main difference between physical and chemical changes?

• Physical changes result in new substances, while chemical changes do not.

• Physical changes involve a change in temperature, while chemical changes do not.

• Chemical changes can be reversed easily, whereas physical changes cannot.

• Physical changes do not alter the chemical identity of a substance, whereas chemical changes do.

Is boiling water a physical change?

• Boiling water has no effect on its state.

• Boiling water is a chemical change.

• Boiling water is a biological change.

• Yes, boiling water is a physical change.

What happens to food when it is cooked?

• Food becomes inedible when cooked.

• Food undergoes physical and chemical changes when cooked, enhancing flavor, texture, and digestibility.

• Food remains unchanged when cooked.

• Cooking food removes all nutrients.