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Why the surface of the mercury in a glass tube is con vex end that of water concave?
Mercury has a low adhesive force to glass, it would rather bond to itself than another surface. This tends to create a spherical surface on open mercuric faces. Balanced by gravity the hemisphere flattens and creates the slight convex shape observed.
How does condensation work on a glass surface?
Condensation on a glass surface occurs when warm, moist air comes into contact with the cooler surface of the glass. The air cools down upon contact with the glass, causing the water vapor in the air to condense into liquid water droplets on the surface of the glass.
Why does alcohol cling to a glass rod while mercury does not?
Cohesion is the tendency of molecules to be attracted to similar molecules. Adhesion is the tendency of molecules to be attracted to dissimilar molecules.Water is both cohesive and adhesive, as is ethanol alcohol. The cohesiveness of water can be demonstrated by filling a cup with water and placing a wet clothe over the top of the cup, then flipping the cup upside down. The water will not entirely spill out of the cup.Mercury is cohesive, but not adhesive, so two drops of mercury will absorb one another, but dipping a clothe in mercury will not absorb it.The phenomenon of cohesion and adhesion can be understood by looking at the molecular structure and charge distribution of a molecule.
Why does a mercury-in glass thermometer first drop slightly when placed in boiling water?
When placed in boiling water, the materials comprising the thermometer respond in the order in which the heat penetrates them. As the heat first permeates the glass cylinder, the cylinder expands, enlarging the bore. For the moment until the mercury is also heated, the constant volume of mercury fills the expanded bore to a slightly lower depth. When the heat reaches the mercury and it also expands, its volume to increase, and the liquid depth rises in the bore.
What liquid have the strongest surface tension?
Mercury is the liquid with the strongest surface tension.
Why does water wet glass and mercury does not?
Water wets glass because the force of adhesion between the glass molecules and water molecules is greater than the force of cohesion between the water molecules and glass molecules. Mercury does not wet glass because the force of cohesion is greater than the force of adhesion
Why the surface of the mercury in a glass tube is con vex end that of water concave?
Mercury has a low adhesive force to glass, it would rather bond to itself than another surface. This tends to create a spherical surface on open mercuric faces. Balanced by gravity the hemisphere flattens and creates the slight convex shape observed.
Can mercury wet a substance?
Mercury is a metal unlike water which have hydrogen bonding. Mercury does not wet most substances, because of its high cohesion and low adhesion to the glass mercury will not wet glass. Cohesion, along with adhesion(attraction between unlike molecules), can help explain mercury phenomena. Mercury has a surface energy over 6 times greater than that of water so there is a much greater attractive force between the atoms of mercury than between the molecules of water, so mercury does not wet glass.
Why is glass described as hydrophillic?
Glass is described as hydrophilic because its surface has an affinity for water molecules, allowing water to spread out evenly and form a thin film instead of beading up. This property is due to the presence of hydroxyl groups on the glass surface that attract and bond with water molecules.
Why does a piece of glass float in mercury but sinks in water?
Glass floats in mercury because mercury is much denser than glass, creating a buoyant force that allows the glass to float. In contrast, water is less dense than glass, causing the glass to sink due to its higher density. The buoyant force in water is not enough to support the heavier glass object.
What liquid is not wet?
The "wetting" that happens when an object is immersed in a liquid depends on the surface energy of the object and the capilary forces in action on the surface of the liquid. for example mercury will not "wet" glass but water can wet the same glass.
Does water or Mercury have greater surface tension?
mercury
What would be least conductive cooper salt water glass or mercury?
Glass
Why a drop of water put on a glass plate spreads?
When a drop of water is placed on a glass plate, it spreads out due to surface tension. Surface tension is the property of a liquid that causes its surface to behave like a thin elastic sheet. The water molecules at the surface of the drop are pulled inward by the cohesive forces between water molecules, causing the drop to spread out to minimize its surface area.
How does condensation work on a glass surface?
Condensation on a glass surface occurs when warm, moist air comes into contact with the cooler surface of the glass. The air cools down upon contact with the glass, causing the water vapor in the air to condense into liquid water droplets on the surface of the glass.
Why is glass hydrophillic?
Glass is hydrophilic primarily due to its polar surface, which contains silanol (Si-OH) groups. These groups can form hydrogen bonds with water molecules, allowing water to spread and adhere to the glass surface rather than bead up. The presence of these polar sites enhances the interaction between glass and water, leading to increased wettability. This property is essential in various applications, including labware and coatings.
Why there is water on glass when ice melts?
Water forms on the surface of the glass when ice melts due to condensation. As the ice melts, it releases water vapor which comes into contact with the cooler surface of the glass, causing it to condense and form water droplets.
