23. Examine the graph below, and answer the following questions: a. What is the boiling point of the sub- stance? What is the melting point? b. Which state is present at 30°C? c. How will the substance change if energy is added to the liquid at 20°C? 80 60 Temperature (°C) 40 20 0 Energy

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

How have the greenhouse gasses increased from the year 2000 to 2018

Freezing and boiling are endothermic processes. this means that these processes absorb energy from their surroundings in order to occur. use this information and the data you collected in the phase change gizmo to describe what happens to the temperature of water when you boil it, then explain why this result occurs.