Question

what do these two changes have in common?
shaking up salad dressing
pouring milk on oatmeal
select all that apply.
both are only physical changes. both are chemical changes.
both are caused by heating. both are caused by cooling.

Explanation:

• Physical change: A physical change is a change in which no new substances are formed. Shaking up salad dressing just mixes the components (which were already present) and pouring milk on oatmeal is a simple mixing process. In both cases, the substances retain their chemical identities.
• Chemical change: A chemical change would involve the formation of new substances. Since no new substances are formed in these two processes, they are not chemical changes.
• Caused by heating or cooling: There is no mention of heating or cooling in the processes of shaking salad dressing or pouring milk on oatmeal. These are just mixing actions that do not rely on temperature - related causes like heating or cooling to occur.

Answer:

Both are only physical changes.