Which of the following properties measures the energy needed...

Which of the following properties measures the energy needed to increase the surface area of a liquid? Multiple Choice Cohesion Specific elasticity Capillary action Viscosity Surface tension

Transcript

00:01 All right so the question is which of the following properties measures the energy needed to increase the surface area of a liquid right and you have cohesion i'm going to define what each of them is right now cohesion or cohesive forces right talks about the kind of forces that exist between particles similar particles that are the same so you for example um in water right uh one of the reasons you have a the kind of shape of meniscus right you have with water is that the cohesive forces which is between the particles of water right are less than the dsc force between water and the tube right that's so cohesion is talking about um intermolecular forces between same like similar particles now specific elasticity that's not something that you know is related to chemistry right um so that's not the answer not the answer not the answer uh not at all all right and then we have uh capillary action now capillary action capillary action is the movement right that's it's talking about the ability of a liquid to rise through a tube and it's also a function of the adhesive right and course cohesive forces present in in that in the particle or in that liquid it's a function of the adhesive force and the quessive force right that you have present in the particle so it is not the answer right because it has nothing to do with the surface area and viscosity right that that is a measure that the viscosity of the degree is a measure of um the flow of a liquid the resistance to flow of a liquid right which is also something that's related to the intermolecular force of attraction in the liquid the answer to this question is surface tension right surface tension is the answer to the question that is surface tension is the energy required to increase the surface area of a liquid by a unit amount, right? that is surface tension, right? basically, it's what for liquids with very high intermolecular force of attraction, they tend to have high surface tension.

02:52 Water has a high surface tension because of the strong hydrogen bonds.

02:55 Mercury also is another example of a liquid with very high surface tension, right, because of the strong metallic bonds between the atoms of mercury...

Question

Which of the following properties measures the energy needed to increase the surface area of a liquid? Multiple Choice Cohesion Specific elasticity Capillary action Viscosity Surface tension

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