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  • Level: GCSE
  • Subject: Science
  • Essay length: 1051 words

Water and its importance to living things

Extracts from this essay...

Introduction

Water and its importance to living things Think of what it is you need to survive...Water. Water is essnetial to life itself. Without water life on earth would not exist. It is a major importance to living things, in some organisms up to 90% of their body weight derives from water, the brain is composed of 70% water, and 60% of the human body is water and up to 70-95% of the mass of cells is water. It also provides an enviroment for organisms to live in, 75% of the earth is covered in water. Water is a simple molecule made up of an oxygen atom and two hydrogen atoms, H2O. A pair of electron is shared between an oxygen atom and a hydrogen atom, These electrons are not shared equally, the oxygen has a slight negative charge and the hyrdogens have a slight positive charge. This leaves an unequal charge of distribution, known as a dipole.

Middle

In condensation reactions water is the main ingredient, where water is removed from molecules to bond them together. This occurs with many sugars and carbohydrates. Hydrolysis is used as mean of splitting up moilecules. It is essential to animals and plants, this is because it allows them to make use of stored food, which are in long chains. Water molecules are highly cohesive because of the hyrdrogn bonds between the molecules. This property of water allows plants to pull up water through xylem vessels from the roots to the leaves. The water molecules that meet the air will be tightly held together and the water molecules below them form an elastic film known as the surface tension. Water has strong hydrostatic forces, because of this water is incompressible. This is supportive for soft bodied creatures such as worms and slugs, both of which do not have a skeleton. Cells that are filled with water become turgid and because of water being incompressible plants can support themselves.

Conclusion

Waters Physical Properties * It is unique because it is the only natural substance that is found in three states, liquid, slid and gas. * Unusual because its solid form is lkess dense then the lquid form, which is why ice floats. * Can absorb alot of heat energy before it gets hot. This is why it is valuable in industries and in car radiators as a coolant. But u r now i cant be myslefwitr * Has a very high surface tension, in other words it is sticky and elastic and tends to clump togetherin drops rather than out in a thin film. Surface tension is good for capillary action. This allows water to move though roots of plants and thorugh the tiny blood vessels in our bodies. After doing this i have found out that, even though a weater molecule seems to be very simple and has a structure not so complex as others, it has many specila properties and without these special properties and funcxtions we would not be able to live on this planet.

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