Chemistry High School

When Nitrogen gas gets cold enough it can form a liquid. This liquid nitrogen is an
example of what?
A. A chemical change because it took a significant temperature drop to convert
nitrogen from gas to liquid.
B. A chemical change because the nitrogen underwent a conversion from gas to a
liquids.
C. A physical change because it was only a state change from solid to liquid.
D. A physical change because the temperature drop causes the molecules to completely rearrange.

Answers

Answer 1

Answer:

C.

Explanation:

Phase change is physical.  

Answer 2

When Nitrogen gas forms a liquid is a physical change because it was only a state change from solid to liquid. Therefore, option C is correct.

What is a physical change?

A physical change takes place when some of the features of the matter change but the identity of the material does not. Physical changes can be categorized as reversible and irreversible. For example, the melting of water is reversible since the melted ice can be refrozen.

Physical change can be described as a kind of change where only physical properties of matter such as solubility, color, odor, etc. can change. During physical changes in matter, there will be no chemical bonds are broken or formed between atoms in the molecule.

The chemical composition as well as the chemical nature of the material will remain unchanged while a physical change.  The molecules can rearrange without changing the internal chemical composition of matter.

Therefore, changing the state of nitrogen gas is a physical change.

Learn more about physical change, here:

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