What is the difference between new nail and rusting nail?
Nails are usually made of something with a lot of iron in them. Iron can often rust in an environment that contains water or moisture. So a rusty nail just means that it as been exposed to moisture or water over an extended period of time. The characteristics of rust are a reddish/brown color that forms on the metal.
How can you tell if a change is physical or chemical?
In a physical change the appearance or form of the matter changes but the kind of matter in the substance does not. However in a chemical change, the kind of matter changes and at least one new substance with new properties is formed.
Is chemical change permanent?
Chemical Change Permanent in nature. Since the original composition of the substance changes, one or more new substances are formed. Forms of energy, such as heat, light or electricity, may be emitted or absorbed. A chemical change is generally irreversible.
What are the evidences of chemical change?
There are five signs of a chemical change:
- Color Change.
- Production of an odor.
- Change of Temperature.
- Evolution of a gas (formation of bubbles)
- Precipitate (formation of a solid)
How does temperature affect physical and chemical changes?
Increasing the temperature will cause chemical changes to occur faster. Decreasing the temperature, causes the particles to lose energy which causes them to move around less and slower. The less they move, the less collisions occur, and the less reactions occur between the chemicals = slower reaction rate.
What are examples of chemical and physical properties?
A physical property is a characteristic of a substance that can be observed or measured without changing the identity of the substance. Physical properties include color, density, hardness, and melting and boiling points. A chemical property describes the ability of a substance to undergo a specific chemical change.