What do these two changes have in common?
chicken cooking in an oven
making paper from wood
Both are caused by cooling. Both are caused by heating. Both are only physical changes. Both are chemical changes.
Step 1: Think about each change.
Cooking chicken is a chemical change. The heat causes the matter in the chicken to change. Cooked chicken and raw chicken are different types of matter.
Making paper from wood is a chemical change. Paper is made by mixing tiny pieces of wood with special chemicals. The wood reacts with the chemicals to form pulp. Wood and pulp are different types of matter.
Step 2: Look at each answer choice.
Both are only physical changes.
Both changes are chemical changes. They are not physical changes.
Both are chemical changes.
Both changes are chemical changes. The type of matter before and after each change is different.
Both are caused by heating.
Cooking is caused by heating. But making paper from wood is not.
Both are caused by cooling.
Neither change is caused by cooling.