Metals are elements which have wide application in our daily life.Because of their properties they are used for many purposes.
The properties of metals are as follows:
1.Physical state- metals are solid at room temperature except mercury and gallium which are liquid at room temperature.
2.They are lustrous
3.They are malleable - they can be hammered and made into thin sheet.
4.They conduct electricity.
5.They are hard except potassium and sodium which are soft.
6.They have 1 to 3 electrons in their outermost shell of their atoms.
7.They are heavy and have high density.
8.They have high melting and boiling point.
9.They are electropositive in nature i.e, they give out electrons but do not accept electrons.
Because of these properties, they are used in computers, aerospace, construction, farming, etc.
Monday, October 18, 2010
Sunday, October 17, 2010
Reactivity of elements
Elements are the smallest substances that exist.They react each other to form molecules and compounds.
The reactivity of elements is determined by their dissociation energy and electron affinity.
Among the elements, halogens are the most reactive elements due to their low dissociation energy and high electron affinity value.Florine is the most reactive element due to weak bond between florine atoms because of strong repulsion between the non-bonding electrons.Florine, chlorine, bromine, iodine, hydrogen, oxygen and nitrogen are called halogen group.
You can learn the reactivity of elements from Reactivity series which is a summarized information about the reactivity of all element.It is by these reactivities that chemical reactions take place.
The reactivity of elements is determined by their dissociation energy and electron affinity.
Among the elements, halogens are the most reactive elements due to their low dissociation energy and high electron affinity value.Florine is the most reactive element due to weak bond between florine atoms because of strong repulsion between the non-bonding electrons.Florine, chlorine, bromine, iodine, hydrogen, oxygen and nitrogen are called halogen group.
You can learn the reactivity of elements from Reactivity series which is a summarized information about the reactivity of all element.It is by these reactivities that chemical reactions take place.
Nutrition in plants
Nutrition may be defined as the process obtaining food to support life.Plants use minerals as their food.
Plants absorb minerals from soils.So, fertility which means the capability of soil to provide nutrients to
plants determine the healthy growth of plants.
Most of the plants are autotrophic.Autotrophs are those that utilize carbon dioxide as their sole provider of carbon.Nutrition in plants is supported by sun through the process called photosynthesis.For example carbohydrate which is the main source of energy is obtained by using carbon, hydrogen and oxgygen
through the process photosynthesis.
The study of how plant get mineral to prepare food is known as mineral nutrition.
If plants do not get sufficient nutrients, specific symptoms appear due to deficiency
of a particular mineral.
There are some methods of supplying nutrients to plants for a healthy growth.
These methods are very helpful for good a harvest.use of fertilizers is one example of providing
nutrients to plants.
Plants absorb minerals from soils.So, fertility which means the capability of soil to provide nutrients to
plants determine the healthy growth of plants.
Most of the plants are autotrophic.Autotrophs are those that utilize carbon dioxide as their sole provider of carbon.Nutrition in plants is supported by sun through the process called photosynthesis.For example carbohydrate which is the main source of energy is obtained by using carbon, hydrogen and oxgygen
through the process photosynthesis.
The study of how plant get mineral to prepare food is known as mineral nutrition.
If plants do not get sufficient nutrients, specific symptoms appear due to deficiency
of a particular mineral.
There are some methods of supplying nutrients to plants for a healthy growth.
These methods are very helpful for good a harvest.use of fertilizers is one example of providing
nutrients to plants.
Chemistry problems
I hope this article will help you in understanding the basic concepts of Chemistry.The Chemistry problems you are facing will be solved if you know if you know what chemistry is all about.
Let me define "What is Chemistry?"
Chemistry is the science of matter and energy and the interaction between them.
Matter is anything that exist in mass.The smallest substances that exist in the earth are elements.
In Chemistry you will learn about how elements interact to form atoms and molecules, how compounds are formed.For example, water H2O is formed by two atoms of hydrogen and one atom of oxygen.In nature positive and negative charges attract each other, some atoms have negative charges and some positive charges.According to free charges available in an atom and charges needed by another atom, interactions are taken place to stabilize the atoms that are not stable.So, in order to stabilize an om chemical bonding takes place.
Next time we will learn about Chemical bonding in detail.
.
Let me define "What is Chemistry?"
Chemistry is the science of matter and energy and the interaction between them.
Matter is anything that exist in mass.The smallest substances that exist in the earth are elements.
In Chemistry you will learn about how elements interact to form atoms and molecules, how compounds are formed.For example, water H2O is formed by two atoms of hydrogen and one atom of oxygen.In nature positive and negative charges attract each other, some atoms have negative charges and some positive charges.According to free charges available in an atom and charges needed by another atom, interactions are taken place to stabilize the atoms that are not stable.So, in order to stabilize an om chemical bonding takes place.
Next time we will learn about Chemical bonding in detail.
.
Friday, October 15, 2010
Biology
What is Biology?
Biology is the science of living beings including their structure, function, growth, origin, evolution, distribution, and taxonomy.
Importance of biology: Biology is is very important for our daily lives.
Agriculture which is the basic activities of human being depend on Biology. It is through the study
of plants and the basic principle which is followed by them in preparing food.It studies what all are
required for a healthy growth of plants.
By advancing in science,human health and well-being are improved.Scientists have discovered how to prevent diseases by developing vaccines.
You will find most of the time in newspapers or science magazines the recent development in
how to fight against cancers and many incurable diseases.
Biology is the science of living beings including their structure, function, growth, origin, evolution, distribution, and taxonomy.
Importance of biology: Biology is is very important for our daily lives.
Agriculture which is the basic activities of human being depend on Biology. It is through the study
of plants and the basic principle which is followed by them in preparing food.It studies what all are
required for a healthy growth of plants.
By advancing in science,human health and well-being are improved.Scientists have discovered how to prevent diseases by developing vaccines.
You will find most of the time in newspapers or science magazines the recent development in
how to fight against cancers and many incurable diseases.
Uses of nitrogen
Nitrogen is one of the elements that exist the earth.Many industrial compounds contains nitrogen.
Ammonia, nitric acids and cyanides contain nitogen.
Uses of Nitogen:1. Nitrogen is used in beer by mixing with carbon to maintain the saturation of beer
with carbondioxide.
2.Liquid nitogen used as an refrigerant.
3. Some nitrogen compounds are used as fertilizer.
Nitrogen is found as gas in the atmosphere.It enters into living organism through lightning.It is converted into biologically useful compounds through lightning.
Ammonia, nitric acids and cyanides contain nitogen.
Uses of Nitogen:1. Nitrogen is used in beer by mixing with carbon to maintain the saturation of beer
with carbondioxide.
2.Liquid nitogen used as an refrigerant.
3. Some nitrogen compounds are used as fertilizer.
Nitrogen is found as gas in the atmosphere.It enters into living organism through lightning.It is converted into biologically useful compounds through lightning.
Types of carbohydrates
Carbohydrates are found mostly in rice.It is an organic compound of carbon, oxygen and hydrogen.
Most food contain carbohydrates.
Carbohydrates in food are broken down into simple sugars.The main function of carbohydrates is
to provide energy to the body.
Carbohydrates are of two types:
1.Simple carbohydrates and 2.Complex carbohydrates.
Simple carbohydrates are also called sugars.Complex carbohydrates include fibers and starches.
Carbohydrates are nothing , you are seeing with your eyes everyday whenever you eat your meal.You can find it in fruits as well.
Most food contain carbohydrates.
Carbohydrates in food are broken down into simple sugars.The main function of carbohydrates is
to provide energy to the body.
Carbohydrates are of two types:
1.Simple carbohydrates and 2.Complex carbohydrates.
Simple carbohydrates are also called sugars.Complex carbohydrates include fibers and starches.
Carbohydrates are nothing , you are seeing with your eyes everyday whenever you eat your meal.You can find it in fruits as well.
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