Essays Tagged: "water molecule"

What is Convection and why Convection can't [simply] happen in solids?

ply] happen in solids. Why?Because there are no free molecules.Examples of convection1.Domestic hot water systemCold water in the tanks is heated by electric element at the bottom. The hot water molec ... ules are now cooler and start to sink to the bottom. The cycle is repeated again and again. This is water convection.2.Breezes(a) Sea breeze (in the day)Gentle coast wind blowing off the sea towards t ...

(2 pages) 25 0 3.0 Nov/2002

Subjects: Science Essays > Chemistry

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

Phase changes of a water molecule.

Hi, I am Bozzly, the water molecule. Join me with my band of molecule friends as we experience the phase changes of water ... table and pull up a chair to watch this scientific process. For us to change into a gas, we liquid water molecules must vaporize. During this process, we must absorb heat energy to escape from the li ... at energy to escape from the liquid phase. Changes in temperature affects the rate that it takes us water molecules to absorb heat in order to evaporate. Since it is a hot day today, the water will ev ...

(3 pages) 27 0 4.5 May/2003

Subjects: Science Essays > Chemistry

Chemical and Physical Matter and its Properties.

nd is the substance that is made from the atoms of two or more elements that are chemically bonded. Water is an example of a compound because it is one of many compounds that consist of molecules. The ... pounds that consist of molecules. The hydrogen and oxygen molecules are chemically bonded to form a water molecule.Properties and Changes in MatterEvery substance, whether an element or compound, has ...

(3 pages) 85 2 4.3 Oct/2003

Subjects: Science Essays > Chemistry

This is an essay comparing the light and dark reactions of photosynthesis and C3 and C4 plants.

hoto system I is knon as P700 and the reaction center in Photosystem II is P680. The splitting of a water molecule is required to extract electrons for the P680. The cholorphyll molecule becomes excit ... his energy is used in the production of NADPH after a redox reaction. The oxygen that came from the water molecule is released through the air.In C4 and C3 plants, CO2 enters through the stomata and i ...

(1 pages) 44 0 4.3 Dec/2003

Subjects: Science Essays > Biology > Plant Biology

Oxygen is one of the most important and abundant elements on Earth

lorless and odorless and makes up about 20.95 percent of the atmosphere by volume. Oxygen exists in water as part of water molecule, in the atmosphere as a gas, in the Earth's crust and in an enormous ... ule in our bodies. Without it, human life simply could not exist. Humans can live for weeks without water, and go without food for months, but without Oxygen, life could only carry on for a matter of ...

(2 pages) 53 2 3.0 Mar/2004

Subjects: Science Essays > Biology

Describe The Roles of Water in Living Organisms

A molecule of water consists of one oxygen and two hydrogen atoms joined by covalent bonds. Water as a liquid is v ... could lead to loss of ability to function at all. Therefore thermoregulation is very important and water plays a part in this. One method of reducing internal body heat is sweating; sweat is mostly m ... of reducing internal body heat is sweating; sweat is mostly made up of water. The structure of the water molecule means that it has very high melting and boiling points for a molecule of its nature b ...

(4 pages) 33 0 3.0 Mar/2004

Subjects: Science Essays > Biology

Investigating the rate of reaction between Sodium Thiosulphate and Hydrochloric Acid

ate of reaction changes with differing concentrations of Sodium Thiosulphate, Hydrochloric Acid and water. As an inert and stable liquid, water was used to alter concentration of Sodium Thiosulphate w ... oncentration of Sodium Thiosulphate without changing the end amount of solution. All the atoms in a water molecule have a full outer shell, so they would not react with the other chemicals.Equipment : ...

(5 pages) 57 0 3.7 Apr/2004

Subjects: Science Essays

Water and It's Pollution

n. Physical properties-the result of hydrogen bondingStudied in isolation, the water molecule is deceptively simple. Its tow hydrogen atoms are joined to the oxygen atom by single ... nd more time closer to the oxygen atom. In other words, the bonds that hold together the atoms in a water molecule are polar covalent bonds, with the oxygen region of the molecule having a partial neg ... he molecule having a partial negative charge and the hydrogen having a partial positive charge. The water molecule, shaped something like a wide V, is a polar molecule, meaning that opposite ends of t ...

(12 pages) 186 1 4.2 Apr/2004

Subjects: Science Essays > Atmospheric Sciences

Photosynthesis and Cellular Respiration

gent and there is a "space" left where the electron used to be. An enzyme then takes electrons from water to replace the electron lost. This reaction splits a water molecule into two hydrogen ions and ... t over and there are hydrogen waiting at the bottom. The oxygen joins with the hydrogen and creates water.

(3 pages) 121 1 4.0 May/2004

Subjects: Science Essays > Biology > Plant Biology

Water.

For all living organisms, water is the most important substance on Earth. If there would be no water on Earth, there would be ... ter on Earth, there would be no life on our planet, since life has always been closely connected to water.Due to its structure, water has many characteristics, which make it unique. Because of its mol ... tructure, water has many characteristics, which make it unique. Because of its molecular structure, water is a polar molecule. The unequal distribution of charges between the poles of the water molecu ...

(1 pages) 503 1 1.7 Nov/2005

Subjects: Science Essays > Biology

The Importance of Water to Life on Earth.

Water is the most important substance in our evolution and our daily lives. Without water, life as w ... lives. Without water, life as we know it would not have been possible. This essay will examine the water molecule in order to ascertain how it brought about Earth's successful ecosystem and how impor ... scertain how it brought about Earth's successful ecosystem and how important it is to us today.Each water molecule consists of one oxygen atom and two hydrogen atoms. The oxygen atom bears a slight el ...

(3 pages) 35 0 3.0 Jan/2006

Subjects: Humanities Essays > Health & Medicine

Properties of water and their importance to the natural world

"When the well is dry, we know the worth of water."-Benjamin Franklin (Poor Richard Almanac, 1746)Water is a polar molecule with covalent bon ... ive oxygen of a nearby molecule. The two molecules are thus held together by a hydrogen bond. Each water molecule can form bonds with up to four neighbors. This property of water enables life to exi ... water enables life to exist on Earth.Oceans and lakes don't freeze solid because ice floats. As water-cools it expands at 0oC it is becomes hydrogen bonded to four other molecules creating spacing ...

(3 pages) 59 0 5.0 Apr/2006

Subjects: Science Essays > Biology

The chemistry of water

A water molecule consists of one atom oxygen with two atoms of hydrogen connected to it forming a  ... nd a negative charge on the side with the hydrogen atoms. This creates hydrogen bonding which gives water its unusual characteristics. Hydrogen bonds are weak temporary bonds that form when the positi ... al characteristics. Hydrogen bonds are weak temporary bonds that form when the positive part of one water molecule attracts a negative part of a different water molecule. Hydrogen bonding makes water ...

(2 pages) 25 1 2.0 Jun/2007

Subjects: Science Essays > Chemistry

Determine Unknown Element in Monoprotic Acid

ds that produce OH- ions. Neutralization of acids occur when they react with bases to form salt and water molecule at pH 7. Strong acids and bases dissociate completely in water but weak acids and bas ... .100M NaOH solution0.26g of an unknown acid with the formula, HAFew drops of phenolphthalein10mL of waterApparatusConical FlaskBuretteWeighing bottleMETHODSWeigh accurately about 0.26g of unknown acid ...

(3 pages) 18 0 0.0 Apr/2010

Subjects: Science Essays > Chemistry

Year 12 Chemistry: Production of Materials. Ethanol Research Task

t in this process and the catalyst used.A dehydration reaction is a reaction in which a molecule of water is removed from a compound. The molecule of water is released as one product.A hydrogen atom a ... ased as one product.A hydrogen atom and OH group are removed from adjacent carbon atoms to form the water molecule. Each carbon atom has an unpaired electron and both of them join up to form a carbon- ...

(7 pages) 15 0 0.0 Jun/2010

Subjects: Science Essays > Chemistry