Q . Give three properties of physical changes and give one example for each change .
Answers
Answer:
Examples of physical properties include melting, transition to a gas, change of strength, change of durability, changes to crystal form, textural change, shape, size, color, volume and density. An example of a physical change is the process of tempering steel to form a knife blade.
Explanation:
Physical properties can be observed or measured without changing the composition of matter. Physical properties are used to observe and describe matter. Physical properties of materials and systems are often described as intensive and extensive properties. This classification relates to the dependency of the properties upon the size or extent of the system or object in question.
An intensive property is a bulk property, meaning that it is a physical property of a system that does not depend on the system size or the amount of material in the system. Examples of intensive properties include temperature, refractive index, density, and hardness of an object. When a diamond is cut, the pieces maintain their intrinsic hardness (until their size reaches a few atoms thick). In contrast, an extensive property is additive for independent, non-interacting subsystems. The property is proportional to the amount of material in the system.
Intensive properties: A physical property that will be the same regardless of the amount of matter.
density: ρ=mvρ=mv
color: The pigment or shade
conductivity: electricity to flow through the substance
malleability: if a substance can be flattened
luster: how shiny the substance looks
Extensive Properties: A physical property that will change if the amount of matter changes.
mass: how much matter in the sample
volume: How much space the sample takes up
length: How long the sample is
Physical Change
Change in which the matter's physical appearance is altered, but composition remains unchanged.
A physical change takes place without any changes in molecular composition. The same element or compound is present before and after the change. The same molecule is present through out the changes. Physical changes are related to physical properties since some measurements require that changes be made. The three main states of matter are: Solid, Liquid, Gas
Solid is distinguished by a fixed structure. Its shape and volume do not change. In a solid, atoms are tightly packed together in a fixed arrangement.
Liquid is distinguished by its malleable shape (is able to form into the shape of its container), but constant volume. In a liquid, atoms are close together but not in a fixed arrangement.
Gas is made up of atoms that are separate. However, unlike solid & liquid, a gas has no fixed shape and volume.
Example 11 : Physical Change
When liquid water ( H2OH2O ) freezes into a solid state (ice), it appears changed; However, this change is only physical as the the composition of the constituent molecules is the same: 11.19% hydrogen and 88.81% oxygen by mass.
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