Classify the following into chemical changes and physical changes. (06)
Are not usually reversible.
One or more new objects are formed.
No sound or gas is produced.
The shape or dimension of the object changes.
New smell is not produced.
Heat or radiation is produce.
Answers
Answer:
1. Chemical Change
2. Chemical Change
3. Physical Change
4. Physical Change
5. Physical Change
6. Chemical Change
Explanation:
1. usually irreversible change is known as chemical change.
2. In a chemical reaction new substances are formed, thus a chemical change occurs.
3. Evolution of gas and production of sound are some of the characteristics of a chemical reaction,thus this is a physical change.
4. The shape or the dimension only changed, which means its physical appereance has changed and its chemical nature hasn't changed, thus it a physical change.
5. A new smell means that there should be an evolution of gas which is one of the characteristics of a chemical reaction. As it is not happening in this case, it is a physical change.
6. Heat is given out, that means it is an exothermic reaction, which only occurs in a chemical reaction, thus it is a chemical change.
I hope this information is helpful to you.
Answer:
1. chemical change
2. chemical change
3. physical change
4 physical change
5. physical change
6. chemical change