Chemical and Physical Changes and Properties

What is a physical change?

• A change that alters the chemical composition of a substance.

• A change that affects one or more physical properties of a substance without altering its chemical composition.

• A change that occurs only at high temperatures.

• A change that can be reversed without any external influence.

What is an example of a chemical change?

• Baking cupcakes, as it involves a chemical reaction that produces new substances.

• Melting ice, which is a physical change.

• Boiling water, which is a physical change.

• Cutting paper, which is a physical change.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Is a candle burning a physical or chemical change?

• A candle burning is a physical change because it only changes shape.

• A candle burning is a chemical change because it produces new substances, such as carbon dioxide and water vapor.

• A candle burning is neither a physical nor a chemical change.

• A candle burning is a physical change because it melts the wax.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What is a chemical change?

• A change that results in the formation of new chemical substances.

• A physical change that does not alter the chemical composition.

• A process that only involves the mixing of substances without any reaction.

• A change that can be easily reversed without any new substances formed.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What is an example of a physical property?

• The blue color of copper sulfate

• The reactivity of sodium with water

• The boiling point of water

• The flammability of gasoline

What is an example of a physical change?

• Ripping up paper

• Burning wood

• Rusting iron

• Mixing vinegar and baking soda

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

• A physical property can be observed without changing the substance's chemical identity, while a chemical property can be observed without any reaction.

• A physical property can only be observed during a chemical reaction, while a chemical property can be observed without changing the substance's identity.

• A physical property can be observed without changing the substance's chemical identity, while a chemical property can only be observed during a chemical reaction.

• There is no difference; both properties describe the same characteristics of a substance.

Tags

NGSS.MS-PS1-4

Is boiling water a physical or chemical change?

• Boiling water is a physical change because it changes from liquid to gas without altering its chemical composition.

• Boiling water is a chemical change because it produces steam.

• Boiling water is a physical change but it alters its chemical composition.

• Boiling water is neither a physical nor a chemical change.

Tags

NGSS.MS-PS1-4

What happens to the particles in a liquid?

• Particles are far apart and move freely, allowing liquids to expand indefinitely.

• Particles are close together but can move past one another, allowing liquids to take the shape of their container while maintaining a definite volume.

• Particles are tightly packed and cannot move, making liquids incompressible.

• Particles are in a fixed position and vibrate, preventing any flow.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

What happens to the particles in a gas?

• Particles are tightly packed and vibrate in place.

• Particles are far apart and move freely, filling the entire volume of their container.

• Particles are in a fixed position and do not move.

• Particles are close together but can slide past one another.