There are certain processes that if they were to happen in a beaker that would make the beaker cooler. What are those processes called?

Asmall amount of a solid is added to water. the observation made after fifteen minutes is shown in the figure. which of these solids has been probably added to water? a) oil b) sand c) sugar d) wood chips

Which of the following signs of a chemical reaction are observed in the reaction of potassium with water? precipitate formed temperature change smell produced gas produced color change

Which metal exist in liquid state and can be cut with knife ?