1) Any mixture of things typically has properties different than its components.
Examples:
a) Mixing pure elements to make a new chemical compound (e.g. Oxygen plus Carbon can combine to form CO2, which has properties different than either C or O. Carbon monoxide has different properties than CO2)
b) Mixing chemicals - e.g., Hydrochloric Acid (HCl) plus Sodium Hydroxide (NaOH, aka. Lye) combines to form water H2O and ordinary salt (NaCl)
c) Mixing metals forms an Alloy - e.g., Gold plus a little copper yields "red gold" which is harder than pure gold. Lead mixed with tin has a lower melting point than either metal.
d) Agregates - Even a mixure of sand and water to create wet sand has properties (behaviors) different than the separate components (try building a sand castle with dry sand). Mixing paint produces a new color of paint.
2) Phase change
Examples:
a) Water has different properties when frozem, liquid or steam
b) Solid CO2 (aka. Dry Ice) has different properties than gaseous CO2
3) Application of energy
Examples
a) Baking cake batter irreversibly changes the batter into something with different properties (yum!) Frying an egg causes an irreversible property change.
b) Roasting limestone to remove the water of hydration is a important step in making Calcium oxide for use in creating Cement
etc., etc., etc.
physical change
When a substance changes but still retains its original properties, the change is called a physical change. If it didn't retain its original properties, then it went through a chemical change.
When a change in matter alters the basic nature of a substance, it is called a chemical change. In a chemical change, the substances involved react to form new substances with different properties than the original ones.
It would be called a physical change, and would not be a chemical change at all. In order for a chemical change to occur, the original substances (reactants) must have different physical and chemical properties than the new substances (products).
A substance that is formed from one type of atoms with a characteristic set of physical and chemical properties is called an element.
physical change
physical change
Chemical reaction.
That process is called a chemical reaction.
When a new substance is formed with different properties than the original substance, it is called a chemical reaction. Chemical reactions involve the breaking and forming of chemical bonds between atoms to create new substances with unique properties.
When a substance changes but still retains its original properties, the change is called a physical change. If it didn't retain its original properties, then it went through a chemical change.
The change of one substance into a new substance is called a chemical reaction. In a chemical reaction, the atoms of the original substances rearrange to form new molecules with different properties.
These are called Chemical Properties.
These are called Chemical Properties.
This process is called a chemical reaction. Chemical reactions involve the breaking and forming of chemical bonds, resulting in the conversion of one substance into one or more different substances with different properties.
A chemical change produces a new substance with different chemical properties from the original substances. This change involves the breaking and forming of chemical bonds. Examples of chemical changes include burning wood, baking a cake, and rusting of iron.
When a change in matter alters the basic nature of a substance, it is called a chemical change. In a chemical change, the substances involved react to form new substances with different properties than the original ones.