Chemical vs Physical Properties & Change

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.

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 a substance's capacity to ignite and sustain combustion. This characteristic is classified as a chemical property, as it involves a change in the substance's chemical structure.

Tags

NGSS.MS-PS1-2

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.

Tags

NGSS.MS-PS1-2

Which one of these is a chemical property?

• melting point

• boiling point

• color

• flammability

Answer explanation

Flammability is a chemical property because it describes a substance's ability to undergo a chemical change when exposed to fire. In contrast, melting point, boiling point, and color are physical properties.

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 ability to react with acid, oxygen, or flammability are chemical properties, indicating how a substance interacts with other substances.

All of the following are examples of physical properties EXCEPT

• Density

• Heat conductivity

• pH (acidic or basic)

• Boiling point

Answer explanation

pH is a measure of acidity or basicity, which is a chemical property, not a physical one. Density, heat conductivity, and boiling point are all physical properties that describe the state of a substance.

Which of the following is a chemical property of water?

• Reacts with pure sodium

• Boils at 100 ^oC

• Is liquid at room temperature

• Has a density of 1 gm/mL

Answer explanation

The correct choice, 'Reacts with pure sodium', is a chemical property of water, indicating its ability to undergo a chemical reaction. The other options describe physical properties, such as boiling point, state, and density.

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 typically involves a chemical change, resulting in the formation of a new substance with different properties. This distinguishes it from physical properties, where the substance remains the same.

Tags

NGSS.MS-PS1-2

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

• Cutting paper

• Sugar burning

• Freezing water

Answer explanation

Sugar burning is a chemical change because it transforms sugar into new substances (carbon dioxide and water) through combustion. In contrast, cutting paper and freezing water are physical changes, not altering the chemical composition.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

A property that is observed without making changes to the substance.

• Chemical Reaction

• Chemical Property

• Physical Property

• Physical Reaction

Answer explanation

A physical property is a characteristic of a substance that can be observed without altering its chemical structure, such as color, melting point, or density. This distinguishes it from chemical properties, which involve changes in composition.