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Why does water form droplets when it comes into contact with a surface?
Water forms droplets when it comes into contact with a surface due to surface tension. This is caused by the cohesive forces between water molecules, which make them stick together and form a spherical shape to minimize surface area.
What is the attraction between water molecules and the molecules of solid surfaces called?
The attraction between water molecules and solid surfaces is called adhesion. This phenomenon is due to the intermolecular forces between the molecules involved, leading to the water molecules being attracted to the surface of the solid.
The cohesive forces between molecules of mercury are much stronger than those between molecules of water Which substance has the greatest surface tension?
Mercury has the greatest surface tension due to the stronger cohesive forces between its molecules compared to water. Surface tension is the property of liquids that arises from the cohesive forces between molecules at the surface, causing them to minimize surface area.
How do the factors of temperature and surface area affect the rate of chemical reactions?
Temperature affects the rate of chemical reactions by increasing the speed at which molecules move and collide, leading to more successful collisions. A larger surface area allows for more contact between reactant molecules, increasing the chance of collision and reaction. Both factors can increase reaction rates by promoting collisions between reactant molecules.
Process in which vapour molecules are recaptured by molecules at liquid surface?
This process is called condensation. It occurs when vapor molecules lose energy and transition back into a liquid state by interacting with other liquid molecules at the surface. This can happen when the temperature of the vapor decreases or when it comes into contact with a cooler surface.
Is surface tension a contact or non-contact force?
Surface tension is a result of cohesive forces between liquid molecules at the surface, so it is a non-contact force that acts at the interface of the liquid with its surroundings.
How does conduction occur in the atmosphere?
Conduction in the atmosphere happens when heat is transferred through direct contact between the surface of the Earth and the air above it. The warmer surface heats up the air molecules in contact with it, causing them to move faster and spread the heat to neighboring molecules. This process helps to balance temperature differences between the Earth's surface and the air.
What is the origin of force of friction?
Friction is a force that originates from the interactions between the molecules of two surfaces in contact. When these molecules come into contact, they create resistance to the motion of one surface across the other, resulting in friction.
What do you mean when you say that water wets a surface such as the surface of sand?
The term "wetting" has a specialized meaning in surface chemistry. We usually say that a liquid "wets" a surface if the contact angle a droplet of the liquid makes with the surface is less than 90 degrees, and that it "doesn't wet" a surface if the contact angle is 90 degrees or more.
Why does water form droplets when it comes into contact with a surface?
Water forms droplets when it comes into contact with a surface due to surface tension. This is caused by the cohesive forces between water molecules, which make them stick together and form a spherical shape to minimize surface area.
What is the relationship between surface area and rate of reaction?
The increase in surface area of reactants increases the contact between reacting molecules, atoms or ions so the rate of reaction becomes increased.
What is the attraction between water molecules and the molecules of solid surfaces called?
The attraction between water molecules and solid surfaces is called adhesion. This phenomenon is due to the intermolecular forces between the molecules involved, leading to the water molecules being attracted to the surface of the solid.
How does the size of the contact area affect friction on an object?
A larger contact area results in increased friction as more surface molecules are in contact and therefore have the opportunity to interact. Conversely, a smaller contact area reduces friction because there are fewer surface molecules in contact, resulting in less interaction.
What is contact force that resists the motion of one surface across anothersurface?
The contact force that resists the motion of one surface across another surface is called friction. Friction occurs due to the interactions between the molecules of the two surfaces in contact, which resist the relative motion between them. It acts in the opposite direction to the motion, making it harder to move the surfaces past each other.
How is earth atmosphere warmed evenly?
Energy is transferred between the earths surface and the atmosphere via conduction, convection, and radiation. Conduction is the process by which heat energy is transmitted through contact with neighboring molecules.
Why does water bead up on a smooth surface?
Water beads up on a smooth surface due to surface tension, which is caused by the cohesive forces between water molecules. This surface tension minimizes the contact area between water and the surface, causing the water to form beads to reduce the energy required to maintain the surface tension.
Why is the angle of contact of mercury obtuse?
Cohesive force between molecules of mercury is more than adhesive force between molecules of mercury and those of glass. This results in formation of a convex meniscus for surface of mercury. Actually, cohesive and adhesive forces are phenomenon due to surface tension of a liqud. The angle made by mercury from the glass surface is obtuse.
