Changes in Matter

A _____ change is a change where the composition of a substance is changed, which requires the breaking and forming of bonds during a reaction.?

Some types of _____ changes are texture, shape, temperature, and a change in the state of matter.

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

• Burning wood

• Melting ice

• Rotting food

• Mixing vinegar and baking soda

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

• Melting ice

• Mixing vinegar and baking soda

• Heating metal until it glows

• Rubbing wood with sandpaper

What is a common sign of a chemical reaction?

• A change in colour

• A change in temperature

• A change in texture

• A change in shape

What is the difference between a physical change and a chemical change?

• A physical change involves the formation of a new substance, while a chemical change does not.

• A physical change can be easily reversed, while a chemical change cannot.

• A physical change only affects the appearance of a substance, while a chemical change alters its composition.

• A physical change occurs when atoms are rearranged, while a chemical change occurs when the state of matter changes.

Why is the mixing of table salt in water considered a physical change?

• The table salt breaks down into ions, which is a chemical change.

• The table salt remains after the water is evaporated, indicating no permanent alteration.

• The water and table salt form a new substance with different properties.

• The mixing of table salt is a reversible reaction.

What is an alloy?

• A chemical compound formed by the reaction of two or more metals.

• A physical mixture of two or more metals.

• A substance formed by the dissociation of metal atoms.

• A chemical reaction between metal ions and water.

Why is brass considered a physical change rather than a chemical change?

• The copper and zinc atoms chemically bond together to form brass.

• Brass has different properties than copper and zinc, indicating a chemical change.

• The copper and zinc atoms remain in brass without forming new substances.

• The formation of brass involves the breaking and forming of chemical bonds.

What is a chemical reaction?

• The breaking or forming of bonds between molecules or atoms, resulting in the formation of at least one new substance.

• The physical change of a substance from a solid to a liquid state.

• The separation of a solid from a solution.

• The attraction between atoms, ions, or molecules that enables the formation of chemical compounds.