Balancing chemical equations is a process of trial and error. To balance the equation, the amounts of the reactants and products must be changed. As necessary, by adding coefficients in front of the appropriate formulas. When balancing an equation, never change the subscripts, because that changes the substance. To determine the number of atoms of each element, the coefficient is multiplied times the subscripts in each formula.
A chemical equation is a written symbolic representation of a chemical reaction. The reactant chemicals are given on the left-hand side and the product chemical on the right-hand side. The law of conservation of mass says that no atoms can be made in a chemical reaction. Also, it cannot be destroyed. So the number of atoms that are present in the reactants has to balance the number of atoms that are present in the reaction.
There are two practices of balancing a chemical equation. The first one is balancing by Inspection. Balancing by inspection is the most basic method used. It works best for simple problems. More complicated ones require experience. The second one is Balancing by Numerical Method. The most important parts of the numerical methotrexate, contrary to the inspection method, it gives the answer. If the reaction can be balanced, coefficients can be seen. If the reaction can't be balanced, it means that there are more unidentified than independent statements, or that statements are opposite. With inspection method, it won't prove that the equation can't be balanced.
why do we need to balance a chemical equation?
"we need to balance a chemical equation because "law of conservation of mass"" state that mass can neither be created nor destroyed in a chemical reaction.
So number of elements involved in a chemical reaction should remain same at reactant and product side.
Lucifer
Lucifer is another name for "Satan". This is because people interpret a passage in the Book of Isaiah of the Bible in a certain way. Lucifer is Latin. It is made of two parts, "lux-lucis" (light) and "ferre" (to bring).
There are two mentions of "Lucifer" in the Latin Vulgate. is used to refer to the morning star, the planet Venus that appears at dawn: once in to translate the Greek word "Φωσφόρος" (Phosphoros), which has exactly the same literal meaning of "Light-Bringer" that "Lucifer" has in Latin; and once in to translate "הילל" (Hêlēl), which also means "Morning Star".
"Lucifer" is the Latin name for the "Morning Star", both in prose and poetry, as seen in works by Marcus Terentius Varro (116–27 BC), Cicero (106-43 BC) and other early Latin writers
Cicero wrote:
And Pliny the Elder:
Poets also used the word "Lucifer". Ovid has at least eleven mentions of the Morning Star in his poetry. Virgil wrote:
And Statius:
Lucifer is the epitome of evil in the Christian religion. Lucifer is believed by some to be Satan's name when he was still an angel, but it is Latin for 'light bringer' and not originally in the Bible.
The word "Lucifer" was also used in Latin to mean the "morningstar", the planet Venus, and this word was used in the Latin version of Isaiah 14, where the Hebrew version was speaking to a king of Babylonia.
Astrobiology
Astrobiology is the study of life in outer space. The field of astrobiology looks for conditions necessary for life, like liquid water, a good temperature, or the presence of oxygen.
Some possible places to find life in the solar system are Europa, Ganymede, moons of Jupiter, or Titan, and Enceladus, moons of Saturn. These places may have liquid water. They may be too cold to support life on their surfaces, but if they have liquid water, the water must be warm enough to support life. Astrobiologists suggest that there may be a liquid water ocean under their surfaces.
Castle
Castles are medieval buildings which were defensive homes for powerful people. They could be made from wood, stone, or brick, and some were used for hundreds of years. Thousands of castles were built across Europe, the Middle East, and Japan with different designs. Today, most castles are ruins and many are popular tourist attractions.
In England and Wales castles were first used by the invading Normans led by Duke William in 1066. They provided a base for lord of the castle to control the surrounding area and govern their land. Castles were designed to be imposing: their massive defenses deterred attackers and showed the owner's strength.
A few troops in a castle could defend themselves against a much larger army. The most common method for taking a castle would be to besiege or storm it. Each had problems. Storming a castle would kill many of the attackers, but a siege would take a long time. Both methods sometimes failed.
Castles were first built in the 9th century and the practice continued up to the 16th century. A castle was both a home for someone important like a king or noble, and a fort. Castles were designed to keep people out and show how powerful the people inside were. They were sometimes used in war, with many famous sieges like the siege of Kenilworth in 1266 which lasted for six months, or Stirling Castle which was besieged eight times.
Castles could look very strong, but sometimes the defences were mostly for show. The moat around Bodiam Castle is not very deep and could be drained by an attacking army, so was not very practical as a defence. But it made the castle look very impressive, and look bigger than it really is. If the owner of a castle rebelled against their ruler they might be punished by having their castle demolished, known as slighting.
Castles were built in Europe and the Middle East, with similar buildings developing separately in Japan in the 15th century. Castles were usually built from either wood or stone, and sometimes brick. Some castles started off as wooden and were then rebuilt in stone, which was more expensive and a stronger so that the castles could be bigger. They could be built on hills or low areas like the edge of towns or at river crossings. There is the widely held idea that castles were always built on high hills; while there are some castles which make dramatic use of the landscape and are highly visible, there were a lot of factors in choosing where to build castles and only a minority were on hills. For example, many castles were built along the Rhine River so they could stop people using the river without permission.
Depending on the exact definition, the number of castles varies and more castles are still being discovered. The numbers below are rough, and it is difficult to find estimates for some countries like Italy and Spain though they have many castles. Imitation castles have been built in the 19th and 20th century, like Neuschwanstein or some places in the United States but these are not considered genuine castles as they were not meant to be defensive.
The powerful people who built castles also lived in them with their families. They would have servants and a group of people to make sure the castle worked: people fetching water, cooking, clearing the stables, looking after animals, cooking, lighting fires, and checking who was coming into the castle. In peacetime, most castles only had a few soldiers who would guard the place.
Today, most castles have bare stone walls inside but in the Middle Ages they looked very different. Important rooms had colourful tapestries hanging on the walls, and paintings on the ceiling. Other rooms like kitchens or cupboards had plain white walls. Fireplaces kept rooms warm, and candles were used for light at night or in dark rooms. Glass was used later in the Middle Ages, but windows had shutters to keep out the cold and the weather. Religion was an important of the Middle Ages, and castles usually had chapels so that the people who lived there could pray.