Essays Tagged: "water molecules"

Why does water expand when it is frozen?

Water behaves differently than almost all other liquids because it expands when it is frozen. As a l ... he solid usually has a very ordered arrangement of molecules in what is known as a crystal lattice. Water is exceptional because it can maximize the attractive forces between its molecules with an arr ... because it can maximize the attractive forces between its molecules with an arrangement where each water molecule is surrounded by only four other water molecules (If you think of a molecule as spher ...

(1 pages) 64 1 3.0 Dec/2002

Subjects: Science Essays

The Properties of Water By Jeff Collmann What are some properties of water and how do they work?

Water is often considered the bases of life, but what properties of water give it such unique and be ... it such unique and beneficial characteristics to promote life? A few of these properties include: water in the solid state is less dense than in its liquid state, water has a large surface tension, ... he time to actually stop and examine why ice floats they would discover something very unique about water molecules. Unlike most liquids, water expands when it becomes solid. As the temperature reac ...

(2 pages) 57 0 4.0 Dec/2002

Subjects: Science Essays > Biology

Biology Osmosis

ich should lead me to good results at the end of the experiment.HypothesisOsmosis is the passage of water molecules from a weaker solution into a stronger solution, through a partially permeable membr ... lly permeable membrane. In this case, the tiny holes in the membrane of the potatoes will allow the water molecules to pass through in and out of the solution and the potato, depending on the concentr ...

(7 pages) 210 3 4.6 Mar/2003

Subjects: Science Essays > Biology

Experiment with Diffusion, Osmosis, and Hypertonic Solution. Discusses what each is, along with how the experiment was done in a lab.

ter concentration to an area of less concentration is called Diffusion. Osmosis is the diffusion of water through a selectively permeable membrane from an area with greater concentration of water to a ... pertonic Solution is a solution of a higher concentration of solutes and a smaller concentration of water molecules than another solution. However, an Isotonic Solution is a solution that contains an ...

(2 pages) 149 2 4.6 Aug/2003

Subjects: Science Essays > Biology

A lab report on the investigation of temperature on catalase activity.

0 degrees. It would be probable that a little activity would take place around 40 degrees. When the water gets to around 60+ the oxygen bubbles start to froth.It is almost certain that this will happe ... most certain that this will happen due to the behaviour of the atom. This means that the hotter the water gets the more active the water molecules become. Thus the colder the water gets the less activ ...

(3 pages) 96 0 5.0 Oct/2003

Subjects: Science Essays > Biotechnology

Osmosis, of potato chips, got real good mark.

clear process to acquire the answer can be devised.What is Osmosis?Osmosis is the process by which water molecules pass through a partially permeable membrane from an area of high concentration of wa ... permeable membrane from an area of high concentration of water to an area of lower concentration of water (e.g. from distilled water to concentrated sucrose solution). The reason for this is because o ...

(13 pages) 118 0 4.5 Nov/2003

Subjects: Science Essays > Biology

Biology Coursework: The effects of Osmosis on a potato chip in Sugar Solution

his should lead me to good results at the end of the experiment.HypothesisOsmosis is the passage of water from a region of high water concentration through a semi-permeable membrane to a region of low ... hrough a semi-permeable membrane to a region of low water concentration. When a potato is placed in water, the cells will expand by gaining weight depending on the concentration levels of the solution ...

(3 pages) 51 0 4.6 Jan/2004

Subjects: Science Essays > Biology

Diabetes Types 1 and 2 thoroughly explained

cannot absorb all of the excess glucose. This excess glucose spills into the urine, accompanied by water and electrolytes (ions required by cells to regulate the electric charge and flow of water mol ... ter molecules across the cell membrane) this causes frequent urination to get rid of the additional water drawn into the urine; this triggers excessive thirst to replace lost water and hunger to repla ...

(5 pages) 193 0 3.0 Jan/2004

Subjects: Humanities Essays > Health & Medicine > Diseases

The Chemistry of Food and Cooking : Eggs.

to a circular shape. Different kinds of weak chemical bonds keep the protein curled up tight in the water that surrounds it.When you apply heat an egg, you aggravate the egg-white proteins, and you ma ... t an egg, you aggravate the egg-white proteins, and you make them bounce around. They slam into the water molecules that surround them and bash into each other. All of this bashing around breaks the w ...

(3 pages) 77 0 4.1 Jan/2004

Subjects: Science Essays > Chemistry

The properties and biological importance's of water to living organisms

Water is a simple molecule, yet it is fundamental to life. In active living cells, two-thirds, or o ... fundamental to life. In active living cells, two-thirds, or often more, of the area is occupied by water, and two-thirds of the globe is covered in water. Water is therefore extremely abundant, and i ... the only substance which can be found naturally in all three states - solid (ice), liquid and gas (water vapor). Water molecules bond to each other by means of hydrogen bonds, and this raises its mel ...

(6 pages) 50 0 4.6 Feb/2004

Subjects: Science Essays > Biology

Practical assesment about biology: To determine the water potential of potato tuber cells

OSMOSISAimTo determine the water potential of potato tuber cells.Background knowledgeOsmosis is defined as the movement of wate ... s.Background knowledgeOsmosis is defined as the movement of water molecules from a region of higher water potential to a region of lower water potential through a partially permeable membrane. Osmosis ... of lower water potential through a partially permeable membrane. Osmosis is considered in terms of water potential and solute potential.Water potential is a measure of the kinetic energy of water mol ...

(14 pages) 125 0 3.9 Feb/2004

Subjects: Science Essays > Biology

Osmosis and potato chip invetigation. To determine the effect that varying salt concentration, in a solution, has upon the osmotic ability of potato chips of a given size

of a given size.Scientific Background KnowledgePut simply osmosis is defined as the net movement of water molecules, across a selectively permeable membrane, from a dilute to a concentrated solution.I ... m a dilute to a concentrated solution.It is a special form of diffusion because it can only involve water molecules. However, it is not an isolated laboratory process. Many cell membranes behave as se ...

(8 pages) 61 0 3.0 Feb/2004

Subjects: Science Essays > Biology

Osmosis Investigation

g/l will become turgid and gain in weight because the chip will have a lower concentration than the water and it will take in the water to make the water molecules the same inside as the outside of th ... e weight because outside the chip there is a high concentration of sugar and the chip will give out water to make the water concentration outside equal to that on the inside of the chip.Scientific bac ...

(5 pages) 37 0 5.0 Mar/2004

Subjects: Science Essays > Biology

Investigation into osmosis in potato cells.

gh concentration to a low concentration until they are spread out evenly. Osmosis is the passage of water molecules from a region of high water concentration to a region of low water concentration thr ... concentration through a selectively permeable membrane.How Osmosis WorksThe diagram above shows how water molecules move through the selectively permeable membrane from the region of high water concen ...

(9 pages) 76 1 3.0 Apr/2004

Subjects: Science Essays > Biology

Biology investigation osmosis

entrated sugar solutions increase or decrease in mass.Background knowledgeOsmosis is the passage of water molecules from a weaker, dilute, solution into a stronger, more concentrated, solution through ... oncentrated solution on the right. To even out the solutions a semi permeable membrane allows small water molecules to pass through it from the dilute to the concentrated solution.Turgidity and Flacci ...

(5 pages) 29 0 4.3 Apr/2004

Subjects: Science Essays > Biology

Investigation of Osmosis

o chips change weight in different strength sugar solutions.Introduction:Osmosis is the movement of water molecules across a partially permeable membrane from a region of high water concentration to a ... igh water concentration to a region of low water concentration.The tiny holes in the membrane allow water molecules to pass through. But the large solute molecules are too big to pass through the part ...

(6 pages) 38 0 4.0 May/2004

Subjects: Science Essays > Biology

Investigating the concentration of Glucose inside Cell sap in potatoes Through Osmosis.

a more dilute glucose solution, the potato will gain weight.This is due to Osmosis, the movement of water molecules from an area of high concetration to an area of low concentration. The cell membrane ... m an area of high concetration to an area of low concentration. The cell membranes are permeable to water, and so if the glucose concentration inside the cell is more concentrated than the solution it ...

(4 pages) 40 0 2.3 May/2004

Subjects: Science Essays > Biology

Osmosis Lab Report

IntroductionThe purpose of this experiment was to demonstrate osmosis. Osmosis is the diffusion of water across a selectively permeable membrane (Bell et al 2004). Osmosis is the movement of water mo ... to .732g. As the potatoes were being trimmed and weighed, I prepared five various solutions of salt water. When the potatoes and water we both prepared, we put the potatoes in the salt water and allow ...

(2 pages) 31798 0 3.0 Nov/2004

Subjects: Science Essays

AP Biology: The Properties of Water

Water has many unique properties that make life possible on Earth. One property is cohesion. The coh ... ble on Earth. One property is cohesion. The cohesion property is properly defined as the binding of water molecules by hydrogen bonds. Water has this property as a result of the chemical bonding betwe ... as a result of the chemical bonding between water. Cohesion of the strong hydrogen bonds allows the water molecules to stick together, almost as a unit of one. A force exerted on one of the molecules ...

(4 pages) 42 1 4.6 Dec/2004

Subjects: Science Essays > Biology

Comparing the solubility's of copper sulphate, sodium chloride and potassium nitrate

ium nitrateBackground InformationMolecular solids (sugar) and ionic solids (salts) both dissolve in water. However, they both dissolve in different ways.The intermolecular forces holding molecules of ... molecular forces holding molecules of sugar together are relatively weak so when sugar is placed in water these bonds are broken and individual C12H22O11 molecules are released into solution. It takes ...

(4 pages) 19 0 0.0 Jan/2005

Subjects: Science Essays > Chemistry