Which substance is used in lotions and cosmetics? ammonium hydroxide
acetic acid
formic acid
zinc hydroxide

When you push downward on a book at rest on a table, you feel an upward force. does this force depend on friction? defend your answer.

Mixing salt in water is an example of physical change

Aweather balloon has a volume of 52.5 liters at a temperature of 252 k. the balloon is released and rises to an altitude where the temperature is 295 k. how does this temperature change affect the gas particle motion?