WHAT SO WRONG ABOUT Beryllium Chloride ?????
Beryllium is a metal
Chloride is a non-metal
Beryllium Chloride should be an ionic bond between a non-metal and a metal
However, Beryllium Chloride and Aluminium chloride are the only exceptions, WHY?
INFORMATION OF Beryllium Chloride
Beryllium chloride is the compound with the formula BeCl2. It is a colourless, hygroscopic solid that dissolves well in many polar solvents. Its properties are similar to those of aluminium chloride.
These reactions are so significant as it is a covalent bond between a metal and a non-metal.
Beryllium chloride is made by the reaction between metal and chlorine at high temperatures:
Be + Cl2 → BeCl2
BeCl2 can also be prepared by carbothermal reduction of beryllium oxide in the presence of chlorine. BeCl2 can be prepared by treating Be metal with hydrogen chloride.
USES OF Beryllium Chloride
e.g
Beryllium Chloride is used as a chemical reagent for refining beryllium ores.
Friday, April 15, 2011
Tuesday, March 1, 2011
Term 1 Reflections
Term 1 Lower secondary science
I have learnt a lot through my first term in 2011. We started the term with chemistry, learning the subjects
1) Periodic Table
2) Atomic structure
3) Equation Writing
When i was in secondary 1, chemistry was like a pain to me and i dread it so much, but term 1's chemistry lesson made chemistry my favourite science subject!
For Periodic table i learnt about the uses of the periodic table, groupings' relation to its valence electrons etc... I also learnt the presence of protons, neutrons and electrons in an atom, how it relates to equation writing whereby elements are joined to form mixtures and compounds. I stumbled a lot during the whole process and felt really frustrated at times, it is like 2 voices in me, one so tempting, urging me to give up and indulge in games instead, while deep down, a real fiery passion clinged unto me, convincing me to persevere.
As one's passion is the key to success, my interest and curiosity for science has granted me with great results, an high A1 for my test, getting 2nd in class! I reviewed my paper and realised that it was almost full marks, except for 3 careless mistakes! I was with mixed feelings, rather disappointed with myself for allowing such mistakes to happen but also exhilarated over my performance.
In secondary 1, I found it so hard even getting an A1 in science and found myself suffocating between the A2-B4 vortex.
This was a big spur to me as i had the ambition to get exempted at the end of the year, this was a great beginning for me, not only for my academic results, but also the marks the start of a beautiful relationship with science!
I have learnt a lot through my first term in 2011. We started the term with chemistry, learning the subjects
1) Periodic Table
2) Atomic structure
3) Equation Writing
When i was in secondary 1, chemistry was like a pain to me and i dread it so much, but term 1's chemistry lesson made chemistry my favourite science subject!
For Periodic table i learnt about the uses of the periodic table, groupings' relation to its valence electrons etc... I also learnt the presence of protons, neutrons and electrons in an atom, how it relates to equation writing whereby elements are joined to form mixtures and compounds. I stumbled a lot during the whole process and felt really frustrated at times, it is like 2 voices in me, one so tempting, urging me to give up and indulge in games instead, while deep down, a real fiery passion clinged unto me, convincing me to persevere.
As one's passion is the key to success, my interest and curiosity for science has granted me with great results, an high A1 for my test, getting 2nd in class! I reviewed my paper and realised that it was almost full marks, except for 3 careless mistakes! I was with mixed feelings, rather disappointed with myself for allowing such mistakes to happen but also exhilarated over my performance.
In secondary 1, I found it so hard even getting an A1 in science and found myself suffocating between the A2-B4 vortex.
This was a big spur to me as i had the ambition to get exempted at the end of the year, this was a great beginning for me, not only for my academic results, but also the marks the start of a beautiful relationship with science!
Monday, February 28, 2011
Man VS Nature
I would like to talk about the topic Man vs Nature mainly because it shows how great nature can be. It is like men tries to shape and control his world, but nature will always show man that they are at natures' will. A good example would be the Holland dikes or the Themes surge barriers or the leaves around New Orleans. Each one of these man tries to shape his world, but nature tries to reclaim its territory. Nature can change very quickly and spontaneously while man, even if he is ruled by emotions, still follows a certain pattern or personality, making his reactions "foreseeable" in a way nature cannot be. Thus nature's unpredictability lies in its restlessness and man's predictability in his established character.
Another good example would be a dam. Man builds it, but it must stand up to the forces of the river, which are significant. One crack in the dam and structure is weakened. Many times during flooding smaller dams called levees (made from soil) are put under too much pressure by the water and give way. That happened in New Orleans. Man can be unpredictable. Natural disasters may be unexpected but then so can humans. We can become violent at any given moment.
A video which depicts why man is under nature's thumb
Mankind can be clever and powerful at times but when against the powerful nature, it would destroy anthing in its path and shall have no mercy on us. They can easily crush us dead or make us injured without much effort.
However, everything has their reasons. We have to think what we have done to have agitated Nature. we caused many negative effect on the environment such as
• deforestation
• cutting and burning of trees
• factories giving out toxic gas
• polluted marine life
• pollute the environment
• etc....
Hence, we cannot blame on Mother nature for all disasters, we only have blame ourselves for being too not environmental conscious and so self- centered. In conclusion, we should do our best to protect the environment.
Another good example would be a dam. Man builds it, but it must stand up to the forces of the river, which are significant. One crack in the dam and structure is weakened. Many times during flooding smaller dams called levees (made from soil) are put under too much pressure by the water and give way. That happened in New Orleans. Man can be unpredictable. Natural disasters may be unexpected but then so can humans. We can become violent at any given moment.
A video which depicts why man is under nature's thumb
Mankind can be clever and powerful at times but when against the powerful nature, it would destroy anthing in its path and shall have no mercy on us. They can easily crush us dead or make us injured without much effort.
However, everything has their reasons. We have to think what we have done to have agitated Nature. we caused many negative effect on the environment such as
• deforestation
• cutting and burning of trees
• factories giving out toxic gas
• polluted marine life
• pollute the environment
• etc....
Hence, we cannot blame on Mother nature for all disasters, we only have blame ourselves for being too not environmental conscious and so self- centered. In conclusion, we should do our best to protect the environment.
SI system
Information:
The International System of Units is the modern form of the metric system and is generally a system of units of measurement devised around seven base units and the convenience of the number ten. It is the world's most widely used system of measurement. The older metric system included several groups of units. The SI was developed in 1960. As the SI is not static, units are created and definitions are modified through international agreement among many country. The system has been nearly globally adopted. Three only exceptions are Myanmar, Liberia, and the United States.
The International System of Units is the modern form of the metric system and is generally a system of units of measurement devised around seven base units and the convenience of the number ten. It is the world's most widely used system of measurement. The older metric system included several groups of units. The SI was developed in 1960. As the SI is not static, units are created and definitions are modified through international agreement among many country. The system has been nearly globally adopted. Three only exceptions are Myanmar, Liberia, and the United States.
Acres
Introduction
The acre is a unit of area in a number of different systems, including the imperial and U.S. customary systems. The most commonly used acres today are the international acre and, in the United States, the survey acre. One international acre is equal to 4,046.856 422 4 m2 exactly. One U.S. survey acre is equal to 62,726,400,000⁄15,499,969 m2 = 4,046.872 609 874 252 m2 approximately.
Conversions:
Acres to Hectares: 1 acre = 0.404685 hectares
Acres to Square Meters : 1 acre = 4046.856 m²
Acres to Square Feet : 1 acre = 43560 ft²
Acres to Square Kilometers: 1 acre = 0.004046 km²
Acres to Square Millimeters: 1 acre = 4046856422.4 mm²
Acres to Square Miles: 1 acre = 0.001562 mi²
Acres to Square Yards: 1 acre = 4840 yd²
Acres to Square Centimeters: 1 acre = 40468564.224 cm²
Acres to Square Inches: 1 acre = 6272640 in²
Acres to Square Micrometers: 1 acre = 4.046e+15 µm²
Acres to Square Microns: 1 acre = 4.046e+15 µm²
http://www.metric-conversions.org
Examples of what acres are used
One acre comprises 4,840 square yards or 43,560 square feet[1] (which can be easily remembered as 44,000 square feet, less 1%; or as the product of 66 x 660). Because of alternative definitions of a yard or a foot, the exact size of an acre also varies slightly. Originally, an acre was understood as a selion of land sized at one furlong (660 ft) long and one chain (66 ft) wide; this may have also been understood as an approximation of the amount of land an ox could plough in one day. A square enclosing one acre is approximately 208 feet and 9 inches (63.6 meters) on a side. But as a unit of measure an acre has no prescribed configuration; any perimeter enclosing 43,560 square feet is an acre in size.
Usefulness:
The acre is often used to express areas of land. In the metric system, the hectare is commonly used for the same purpose. An acre is approximately 40% of a hectare.
E.g.
One acre is 90.75 percent of a 53.33-yard-wide American football field. The full field, including the end zones, covers approximately 1.32 acres (0.53 ha).
Origin:
The word "acre" is derived from Old English æcer (originally meaning "open field", cognate to west coast Norwegian language "ækre" and Swedish "åker", German Acker, Latin ager and Greek αγρος (agros).The acre was approximately the amount of land tillable by one man behind an ox in one day. This explains one definition as the area of a rectangle with sides of length one chain and one furlong. A long narrow strip of land is more efficient to plough than a square plot, since the plough does not have to be turned so often. The word "furlong" itself derives from the fact that it is one furrow long.Before the enactment of the metric system, many countries in Europe used their own official acres. These were differently sized in different countries, for instance, the historical French acre was 4,221 square meters, whereas in Germany as many variants of "acre" existed as there were German states.
The acre is a unit of area in a number of different systems, including the imperial and U.S. customary systems. The most commonly used acres today are the international acre and, in the United States, the survey acre. One international acre is equal to 4,046.856 422 4 m2 exactly. One U.S. survey acre is equal to 62,726,400,000⁄15,499,969 m2 = 4,046.872 609 874 252 m2 approximately.
Conversions:
Acres to Hectares: 1 acre = 0.404685 hectares
Acres to Square Meters : 1 acre = 4046.856 m²
Acres to Square Feet : 1 acre = 43560 ft²
Acres to Square Kilometers: 1 acre = 0.004046 km²
Acres to Square Millimeters: 1 acre = 4046856422.4 mm²
Acres to Square Miles: 1 acre = 0.001562 mi²
Acres to Square Yards: 1 acre = 4840 yd²
Acres to Square Centimeters: 1 acre = 40468564.224 cm²
Acres to Square Inches: 1 acre = 6272640 in²
Acres to Square Micrometers: 1 acre = 4.046e+15 µm²
Acres to Square Microns: 1 acre = 4.046e+15 µm²
http://www.metric-conversions.org
Examples of what acres are used
One acre comprises 4,840 square yards or 43,560 square feet[1] (which can be easily remembered as 44,000 square feet, less 1%; or as the product of 66 x 660). Because of alternative definitions of a yard or a foot, the exact size of an acre also varies slightly. Originally, an acre was understood as a selion of land sized at one furlong (660 ft) long and one chain (66 ft) wide; this may have also been understood as an approximation of the amount of land an ox could plough in one day. A square enclosing one acre is approximately 208 feet and 9 inches (63.6 meters) on a side. But as a unit of measure an acre has no prescribed configuration; any perimeter enclosing 43,560 square feet is an acre in size.
Usefulness:
The acre is often used to express areas of land. In the metric system, the hectare is commonly used for the same purpose. An acre is approximately 40% of a hectare.
E.g.
One acre is 90.75 percent of a 53.33-yard-wide American football field. The full field, including the end zones, covers approximately 1.32 acres (0.53 ha).
Origin:
The word "acre" is derived from Old English æcer (originally meaning "open field", cognate to west coast Norwegian language "ækre" and Swedish "åker", German Acker, Latin ager and Greek αγρος (agros).The acre was approximately the amount of land tillable by one man behind an ox in one day. This explains one definition as the area of a rectangle with sides of length one chain and one furlong. A long narrow strip of land is more efficient to plough than a square plot, since the plough does not have to be turned so often. The word "furlong" itself derives from the fact that it is one furrow long.Before the enactment of the metric system, many countries in Europe used their own official acres. These were differently sized in different countries, for instance, the historical French acre was 4,221 square meters, whereas in Germany as many variants of "acre" existed as there were German states.
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