What is a physical change?
What is a chemical change?
What are the signs that a chemical reaction has occurred?
What are the signs that a physical reaction occurred?
Indicate whether the following is a chemical change or a physical change?
Glass breaking? ___________ Why? _________
Sour milk? ________________ Why? _________
Burning a fire? _______________ Why? _________
Tearing a piece of paper? ______________ Why? _______
Answers
Explanation:
that indicate a chemical change occurred include color change, temperature change, light given off, formation of bubbles, formation of a precipitate, etc.
Answer:
1/Physical changes are changes affecting the form of a chemical substance, but not its chemical composition. Physical changes are used to separate mixtures into their component compounds, but can not usually be used to separate compounds into chemical elements or simpler compounds.
2/Chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. These processes are called chemical reactions and, in general, are not reversible except by further chemical reactions.
3/Some signs of a chemical change are a change in color and the formation of bubbles. The five conditions of chemical change: color chage, formation of a precipitate, formation of a gas, odor change, temperature change.
4/ Change in Color. Noticeable Odor (after reaction has begun) Formation of a Precipitate. Formation of Bubbles.
5/Physical changes are changes that do not alter the identity of a substance. Chemical changes are changes that occur when one substance is turned into another substance. Chemical changes are frequently harder to reverse than physical changes.