classify the following as chemical or physical changes(1) burning of paper (2)rusting of almirah (3)freezing water (4)making a fruit salad with fruits
Answers
1) Chemical change
2) Physical change
3) Physical change
4) Chemical change
Answer:
1) Chemical change
2) Chemical change
3) physical change
4) Physical change
Explanation:
Chemical change means The Chemical property of a material or substance gets changes
physical changes means there is no chemical properties of a particular substance but physically it may change
Here,
1) Normal paper is burned and converted in to the form of Ash so it's chemical properties gets changed
2)Rusting is the changes occurring in a surface a particular material in the brownish colour that is due to presence of water and oxygen so,in rusting the oxygen and hydrogen atoms gets additionally added so there is change in it's chemical properties
3)water H2O on freezing it may change to solid and physical properties gets varied but chemical properties remains same
4) Slicing of fruit means we are cutting a big fruit in to small size there is no change in the chemical properties of a fruit only larger particle of fruit bis converted in to smaller particle
in other words,I consider a big Lemon as a fruit I am slicing that in to 6 parts here 1 bigger part is converted to 6 smaller part so here physical changes only occur but in lemon generaly citric acid is present,
and here in bigger lemon citric acid is present and in 6 small pieces also have citric acid only not an malic acid so,it is Physical change not a chemical change