SCIENCE
PHYSICAL SCIENCES
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
physical
|
|
|
chemical
|
|
|
both chemical and physical
|
|
|
neither chemical not physical
|
Detailed explanation-1: -A chemical change because the nitrogen underwent a conversion from gas to a. liquids.
Detailed explanation-2: -The process in which a gas changes to a liquid is called condensation. Other examples of condensation are shown in Figure below. A gas condenses when it is cooled below its boiling point.
Detailed explanation-3: -When a gas is made very cold, it turns into a liquid similar to water. Liquid nitrogen is just very cold nitrogen. It is 320oF below zero (-196oC). It’s so cold that it freezes anything it touches almost instantly.
Detailed explanation-4: -Freezing is a physical change. It involves a liquid changing states to a solid. Thus, freezing a substance will not change its chemical identity, but its state. Freezing a substance is definitely a physical change, but the act of freezing it can have varied results depending on the substance and the temperature.
Detailed explanation-5: -Freezing and boiling are considered to be examples of chemical reactions.