chemical and physical changes

• chemical reactions are a result of chemical change - there is a new substance made that is completely different from the original substance.
• what is a chemical reaction?

  a chemical reaction is a reslut of a chemical change where a new subtance is created
• A physical change does not create a new substance and is usually reversible. An example is crushing a can or melting ice.
• provide and example of a physical change

  crushing a can or melting ice
• a chemical change does create a new substance, it often cannot be reversed. in a chemical reaction, the atoms are rearranged and a new chemical compound is formed. examples are burning or mixing something with acid.
• provide and example of chemical change

  burning or mixing something with acid.
• no matter is created or destroyed in a chemical reaction
• chemical changes go deeper and change the particles themselves. atoms are rearranged into new combinations and forming new chemical substances.
• physical changes alter a substance only in the moment or the arrangement of its particles. it only affects the physical structure or outward appearance. no new substances are formed.
• a physical change occurs without changing the chemical composition of matter.
• physical changes are usually reversible
• in a physical change new products are not formed