BIOCHEMISTRY
POLAR AND NONPOLAR MOLECULES
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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water is more attracted to the sides of the test tube than it is to itself
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water is more attracted to itself than it is to the sides of the container
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water has no attraction to itself or the container
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what is a meniscus?
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Detailed explanation-1: -A concave meniscus, which is what you normally will see, occurs when the molecules of the liquid are attracted to those of the container. This occurs with water and a glass tube. A convex meniscus occurs when the molecules have a stronger attraction to each other than to the container, as with mercury and glass.
Detailed explanation-2: -A capillary tube dipped in a body of free water will form a meniscus as the result of the contact angle of water with the walls of the tube. The curvature of this meniscus will be greater (i.e., the radius of curvature smaller) the narrower the tube.
Detailed explanation-3: -The water molecules are more strongly attracted to the glass than they are to other water molecules (because glass molecules are even more polar than water molecules).
Detailed explanation-4: -Explanation: In the case of water, as density is low, adhesive force is more as compared to cohesive force and capillary rise will take place. Thus, the meniscus will be of concave shape.