Review Physical and CHemical Properties and Changes

Front

What is reactivity?

Back

Reactivity is the ability of a substance to undergo a chemical reaction with another substance. For example, fluorine gas is highly reactive and can ignite materials spontaneously.

Tags

NGSS.MS-PS1-2

Front

What is a physical change?

Back

A physical change is a change that affects one or more physical properties of a substance without altering its chemical composition. For example, boiling water changes from liquid to gas but remains H2O.

Tags

NGSS.MS-PS1-4

Front

What is a chemical change?

Back

A chemical change is a change that results in the formation of new chemical substances. For example, iron rusting is a chemical change where iron reacts with oxygen to form iron oxide.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Front

What happens during boiling?

Back

During boiling, a liquid turns into vapor as it is heated. This is a physical change because the chemical structure of the substance remains the same.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Front

What is combustibility?

Back

Combustibility is the ability of a substance to catch fire and burn in the presence of oxygen. For example, wood is combustible.

Front

What is viscosity?

Back

Viscosity is a measure of a fluid's resistance to flow. For example, honey has a higher viscosity than water.

Front

What is the difference between physical and chemical properties?

Back

Physical properties can be observed without changing the substance's chemical identity (e.g., color, boiling point), while chemical properties can only be observed during a chemical reaction (e.g., reactivity with acid).

Front

What is an example of a physical change?

Back

An example of a physical change is ice melting into water. The substance remains H2O, but its state changes from solid to liquid.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Front

What is an example of a chemical change?

Back

An example of a chemical change is baking a cake. The ingredients undergo a chemical reaction to form a new product.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Front

What is the significance of observing changes in matter?

Back

Observing changes in matter helps us understand whether a physical or chemical change has occurred, which is crucial in chemistry.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5