+91-93193 64476
FlagBACK
Flag 7 grade science> What is Physical and chemical changes Wha...
question mark

What is Physical and chemical changes
What is its ifects
What is its needs to us

Subhasmita Sethy , 5 Years ago
Grade 7
anser 1 Answers
Apurva Sharma
 
PHYSICAL CHANGE:
  1. It is the change of matter wthout changing the chemical composition of matter.
  2. no bond is broken and no new bonds are formed
  3. no new products are formed
  4. its usually reversible
physical changes are important as they do not change te molecule or substance to other.
e.g. water as ice,liquid,and vapours are the three physical state.
  this physical change helps to separate water from other non volatile substance by boiling
 
CHEMICAL CHANGE:
  1. it is the change in chemical composition of matter
  2. bonds are broken and new bonds are also formed
  3. new products are formed
  4. it can be reversible or irreersible
chemical changes help us study the properties of matter and make new or desired substances from other substances.
e.g hydrogen and nitrogen are reacted to form ammonia
 
hope you got the answer.
do hit like
regards!
 
Last Activity: 5 Years ago
star
LIVE ONLINE CLASSES

Prepraring for the competition made easy just by live online class.

tv

Full Live Access

material

Study Material

removal

Live Doubts Solving

assignment

Daily Class Assignments


Other Related Questions on 7 grade science

question mark

Question answers of class 7 reproduction in plants

7 grade science
1 Answer Available

Last Activity: 7 Months ago

question mark

What is the use of kink in a clinical thermometer?

7 grade science
1 Answer Available

Last Activity: 9 Months ago

question mark

Explain the term conduction, convection, and radiation with examples.

7 grade science
1 Answer Available

Last Activity: 9 Months ago

question mark
I have to download the pdf of notes but I can't please tell me that how I can download the pdf
7 grade science
1 Answer Available

Last Activity: 3 Years ago

question mark
Make a sketch showing groundwater and water table. Label it.
7 grade science
1 Answer Available

Last Activity: 4 Years ago