(b) Explain each of the following in terms of water properties (6 points maximum; 2 points for each…
In a flowering plant, the water travels from the soil, then to the root hairs, next to the xylem, then into the stomata, to the mesophyll cells, next to the stoma, then finally into the atmosphere. Osmosis is the diffusion of water through semipermeable membranes. Transpiration is the evaporation of water from the leaf. Cohesion is when water molecules stick together. Adhesion is when water molecules stick to, not attract. Root pressure is force made by root on water columns. Water potential is the negative pressure in leaves, which is positive in roots.…
Why is surface tension associated with cohesion and not adhesion? At the surface of the water, there is an ordered arrangement of water molecules that are hydrogen-bonded to each other and to the water BELOW, not the air above the water. This has a result of pulling the water molecules “down” away from the air-water interface.…
Be sure to review this important presentation before attempting this assignment (you may be prompted for your FLVS User Name and Passcode to begin):…
In mini-lab 1, water was dropped onto the flat surface of a penny until the surface tension of the water was broken. 50 drops were able to be put onto the penny surface, with 51 drops of water being the point at which the hydrogen bonds of the water droplets that had created surface tension prior to drop number 51 failed to keep the surface tension, and the water spilt over the edges of the penny. This number of drops on the penny, 50, was possible because of cohesion. Cohesion created surface tension so the water molecules form hydrogen bonds of a greater strength with the water molecules around them. Cohesion is when a water molecule’s positive hydrogen end bonds with the negative oxygen end of another water…
Surface Tension-A measure of how difficult it is to break or stretch the surface of liquid. Water has a greater surface tension of most liquids…
1. Surface tension - A property of the surface of a liquid. It is what causes the surface portion of liquid to be attracted to another surface, such as that of another portion of liquid. Surface tension is caused by cohesion (the attraction of molecules to like molecules). Since the molecules on the surface of the liquid are not surrounded by like molecules on all sides, they are more attracted to their neighbours on the surface.…
Surface tension results from the formation of hydrogen bonds between the outermost layer of water molecules and the underlying molecules. Water’s ability to form hydrogen bonds causes it to have highest surface tension of any liquid except the element mercury.…
The transport of water upward from roots to shoots in the xylem is governed by differences in water potential, with water molecules moving from an area of high water potential to an area of low water potential. The movement of water through a plant is facilitated by osmosis, root pressure, and the physical and chemical properties of water. Transpiration creates a lower osmotic potential in the leaf, and the TACT mechanism describes the forces that move water and dissolved nutrients up the xylem (AP Bio Big Idea 4).…
The cohesion and adhesion act together to maintain the water column all the way up from the root to the stomata.…
B - What evidence did you use to decide that something was a chemical change?…
The surface tension of water can hold up ice which is good since that helps the liquid water from freezing. The boing and freezing points are perfect for earth temperatures because it keeps water a liquid, other elements like hydrogen sulfide would be in a gaseous state according to earth’s temperatures.…
The fact that ice is less dense than liquid water means that ice in a body of water, such as in a lake or in the sea, floats at the top, rather than sinking to the bottom. So, when a body of water freezes, this takes place from the top down. The ice that forms at the surface acts as an insulating layer so that the underlying water stays above freezing point and organisms living in the water are protected from freezing.…
Water provide and the medium for transportation, acts as a solvent, participates in chemical reaction, provides lubrication and shock protection, and aids in temperature regulation in the human body.…
The three main theories as to how xylem transports water and minerals are root pressure, capillary action, and cohesion-tension/transport pull. The root pressure theory works by the water being pumped into xylem tissue. Then, the minerals and ions absorbed with the water then get pumped up the root. The water then follows the ions and minerals up the xylem, and throughout the plant. Capillary action works by relying on the adhesive properties of water. Because the polarity of the capillary walls attracts water molecules, water sticks to the sides of the tube, therefore, causing the water to move up the tube. Cohesion-tension or transpiration pull works by the water from the leaves being evaporated caused by the heat of the sun. This then causes a change in pressure which moves the water up from the…