Unit 7- Matter and its Changes

Physical properties....

• change the matter when studied

• can be observed and measured without changing the matter being studied

• include the ability to burn and rust

• are useless unless studied in a lab

Answer explanation

The correct choice states that physical properties can be observed and measured without changing the matter. This is fundamental to understanding physical properties, as they do not alter the substance being studied.

______________________ can only be recognized when substances react or do not react chemically with one another.

• Physical properties

• Chemical properties

• Flammable properties

• Colorful properties

Answer explanation

Chemical properties can only be observed when substances react or do not react chemically. This distinguishes them from physical properties, which can be observed without any chemical change.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Flammability means the ability to _______ and is a _________ property.

• melt; chemical

• rust; physical

• change; physical

• burn; chemical

Answer explanation

Flammability refers to the ability to burn, indicating how a substance reacts with fire. It is classified as a chemical property because it involves a change in the substance's chemical structure during combustion.

Which of the following is not a chemical property? 

• rusting 

• boiling 

• rotting 

• burning 

Answer explanation

Boiling is a physical change, not a chemical property. It involves a change in state from liquid to gas without altering the substance's chemical composition, unlike rusting, rotting, and burning, which involve chemical changes.

Which is an example of a physical property?

• ability to react with acid

•  state of matter

• flammability

• ability to react with oxygen

Answer explanation

The state of matter is a physical property, describing the form of a substance (solid, liquid, gas). In contrast, the other options involve chemical properties, which relate to how a substance interacts with other substances.

Tags

NGSS.MS-PS1-4

All of the following are examples of physical properties EXCEPT

• Density

• Heat conductivity

• pH (acidic or basic)

• Boiling point

Answer explanation

pH (acidic or basic) is a chemical property, not a physical one. Density, heat conductivity, and boiling point are all physical properties that describe the state and behavior of a substance.

Tags

NGSS.MS-PS1-4

What is the outcome of observing a chemical property?

• Nothing

• A new substance is formed with different properties

• NaCl

• A rise in thermal conductivity

Answer explanation

Observing a chemical property often leads to a chemical reaction, resulting in a new substance with different properties. This distinguishes it from physical properties, where the substance remains the same.

Tags

NGSS.MS-PS1-2

Density: Chemical or Physical Property

• Chemical Property

• Physical Property

Answer explanation

Density is a measure of mass per unit volume, which can be observed without changing the substance's chemical identity. Therefore, it is classified as a physical property.

Reacts with Acid: Chemical or Physical Property

• Chemical Property

• Physical Property

Answer explanation

Reacts with acid is a chemical property because it describes a substance's ability to undergo a chemical change when interacting with an acid, indicating a transformation at the molecular level.

Melting Point: Chemical or Physical Property

• Chemical Property

• Physical Property

Answer explanation

The melting point is a physical property because it describes a change in the state of matter without altering the substance's chemical composition. Thus, it is classified as a physical property.

Tags

NGSS.MS-PS1-4