Question

hypothesis. hint: to test the hypothesis, you use experiments or observations to collect data. a pot of water boiling on a stove kenny was learning about liquids in chemistry class. his teacher explained that when a liquid is heated to its boiling point, the particles begin to separate from one another. kenny was curious if a liquids boiling point could help you predict its cohesion, or how much its particles tend to stick together. he predicted that liquids with high boiling points must be very cohesive. kenny looked up the boiling points of three liquids: rubbing alcohol (80°c), water (100°c), and vegetable oil (300°c). then he tested the cohesion of each liquid by placing drops of each one on a penny. the more cohesive a liquid is, the more drops can fit without spilling off. he added drops of rubbing alcohol one by one and counted how many drops could fit on the penny until it spilled off. he dried the penny off and tried it twice more, then averaged the three values. he then repeated the procedure with water and vegetable oil. when he compared the averaged values, he found that vegetable oil held the fewest drops on the penny—the opposite of what he expected! he now thought that there must be more to boiling point than just cohesion. he asked his chemistry teacher, and she explained that although cohesion influences boiling point, other factors such as molecular weight and the shape of the molecules affect it as well.

Explanation:

Kenny hypothesized that liquids with high boiling - points are very cohesive. He tested this by looking at the boiling - points of rubbing alcohol, water, and vegetable oil and then tested their cohesion by counting drops on a penny. The results were contrary to his hypothesis. His teacher explained that other factors like molecular weight and shape also affect boiling - point.

Answer:

Kenny's initial hypothesis that liquids with high boiling points are very cohesive was disproven by his experiment. Other factors such as molecular weight and molecular shape also influence boiling - point.