What do these two changes have in common?
a penny tarnishing
chicken cooking in an oven
A: Both are caused by heating.
B: Both are chemical changes.
C: Both are caused by cooling.
D: Both are only physical changes.
Step 1: Think about each change.
Metal turning less shiny over time is called tarnishing. A penny tarnishing is a chemical change. When air touches the penny, the surface of the penny changes into a different type of matter. This matter makes the penny dull.
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.
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 a penny tarnishing is not.
Both are caused by cooling.
Neither change is caused by cooling.