A solution has a higher boiling point than its associated pure solvent does. What is this property of the solution called?

1. boiling-point depression

2. freezing-point depression

3. vapor-pressure lowering

4. boiling-point elevation

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

The valence of aluminum is +3, and the valence of the chlorine is -1. the formula fir the aluminum chloride is correctly written as

Observation and experimentation have led many scientists to accept a theory about the origin of the universe. this theory is called the big bang theory. scientific evidence collected and observed by scientists around the world suggests that the universe is ever expanding from a hot and dense initial state. what makes this a scientific theory? (2 points)