Answer: a) Baking a cake: chemical change
b) Smashing a soda can: Physical change
c) Shredding paper : Physical change
d) Chopping wood: Physical change
e) Burning wood: chemical change
Explanation: Chemical change is defined as a change in which rearrangement of atoms take place and leads to formation of new substances.
Physical change is defined as a change which leads to change in shape, size or state of the substance changes. No new substance is formed.
a) Baking a cake will result in a chemical reaction to evolve carbon dioxide which leads to rise of dough and thus a chemical change.
b) Smashing a soda can will only result in the shape of can and thus a physical change.
c) Shredding paper will only result in the size of paper and thus a physical change.
d) Chopping wood will only result in the size of wood and thus a physical change.
e) Burning wood will result into formation of carbon dioxide and water and thus a chemical change.
