3. Which of the following changes is irreversible?
a. change in state
C. chemical change
b. physical change
d. change in temperature 4. Chemical change result in new substances, but physical change does not. Which process is a chemical change?
a. baking a cake
c. heating a cup of tea
b. chopping a tree
d. drying clothes in the dryer 5. What kind of mixture is produced when two substances mixed together and has only one phase?
a. colloid
c. homogeneous
b. suspension
d. heterogeneous​