Tantalum is a chemical element. Tantalum was named tantalium. It has the chemical symbol Ta. It has the atomic number 73. It is a rare metal. It is hard and blue-gray. In chemistry it is placed in a group of metal elements named the transition metals.
Tantalum does not easily corrode. It is found in the mineral tantalite.
Hafnium
Hafnium is a chemical element. It has the chemical symbol Hf. It has the atomic number 72. It is a metal. It is silver gray. In chemistry it is placed in a group of metal elements named the transition metals. The chemistry of hafnium is similar to zirconium.
Hafnium is found in zirconium minerals.
Hafnium is used in tungsten alloys in filaments and electrodes. It is also used as a neutron absorber in control rods in nuclear power plants.
Lutetium
Lutetium is a chemical element. It has the chemical symbol Lu. It has the atomic number 71. It is a metal and a rare earth element. It is silver white. In chemistry it is placed in a group of metal elements named the transition metals. Lutetium can also be grouped with the lanthanides because it is near the lanthanides in the Periodic Table. Its physical properties are like the lanthanides.
Anaheim Ducks
The Anaheim Ducks are an ice hockey team from Anaheim, California. They are in the National Hockey League (NHL). The Ducks changed the name on June 22, 2006. They used to be the Mighty Ducks of Anaheim. The name comes from the Disney movie "The Mighty Ducks".
The team was created in 1991 and started playing in the 1993 season. The Ducks were originally owned by The Walt Disney Company. In 2005, Disney sold the Ducks to Susan and Henry Samueli
They are in the Western Conference's Pacific Division. They play their home games at Honda Center, in Anaheim, California. Their team colors are black, gold, and orange. Dallas Eakins is the team's head coach. Ryan Getzlaf is the captain of the team.
To date, they have won one Stanley Cup. It was in the 2006-2007 season. The Anaheim Ducks won the conference championship in the 2002-03 season and 2006-2007 season. They have won 6 Pacific division titles.
Móði and Magni
Magni and Móði (Old Norse: "strength" and "bravery") are a pair of minor deities in Norse mythology. They are sons of the god Thor, said to be embodiments of their father's traits. While Magni is born to Thor by the jötunn Járnsaxa (a lover of Thor), the name of Móði's mother is unknown.
Other than his part after Ragnarök, little is known about Móði. Magni however, is featured prominently in the myth of Thor's battle with the giant Hrungnir.
Thor hit the giant Hrungnir in the head with his hammer, Mjölnir, shattering Hrungnir's skull. The giant then fell dead, as his leg landed on Thor's neck, pinning the god to the ground. The other Æsir tried to lift Hrungnir's leg off of Thor, but were unsuccessful. Thor's son, Magni, who was only three days old at the time, then came to his father and lifted Hrungnir's leg off of Thor all by himself. In his gratitude, Thor gifted his son Hrungnir's horse, Gullfaxi (Old Norse: "Gold-mane"). Odin himself was upset that Thor gave the horse to "the son of a giantess" and not to Odin, Thor's own father.
Kerosene
Kerosene or paraffin oil is a colourless flammable liquid, usually used for fuel. Kerosene is made by fractional distillation of petroleum. It may be used as fuel for lamps, in some kinds of cooking stoves, and in heaters. Kerosene is mainly used in the fuel for jet engines. The most common consumer use for kerosene in Canada and the US is lighting camp lamps. Kerosene is used as cooking fuel in India. Kerosene is also used for making ketamine
Brass instrument
A brass instrument is a musical instrument that you play by blowing through a mouthpiece to change the pitch, or note.
Brass players use their breath to produce sound. Instead of blowing into a reed, they vibrate their lips by buzzing them against a metal cup-shaped mouthpiece. The mouthpiece helps to amplify the buzzing, which creates the sound. Most brass instruments have valves attached to their long pipes; the valves look like buttons. Pressing on the valves makes them open and close different parts of the pipe.
With brass instruments, the sound starts at the lips.
Their mouthpieces just help your lips buzz. It does not matter if the instrument is really made of brass, as long as it works that way.
It is not important what the instrument is made of. Some brass instruments are really made of wood, but are still called brass instruments, like the serpent. Other instruments are made of brass but do not work like this, like the saxophone. They are not called brass instruments, because they don't work that way.
There are also parts of the instrument that change the resonance and thus the pitch, like slides or valves.
A brass band is a group of brass instruments and drums that play music together. They are often used to play for parades and processions because the players can march and play at the same time. Brass bands were very popular in England. Many factories and coal mines had their own bands. The workers would play in the bands after work. One famous band is the Grimethorpe Colliery Band.
Crystallization
Crystallization is the way that atoms link up in a regular structure. The structure is held together by chemical bonds or connected groups. Crystallization can be from a melt or from a solution, and can be natural or artificial. Rarely, crystal can form directly from a gas. Faster crystallization makes smaller size crystals as in basalt, and slower can make bigger crystals, as in granite.
Crystallization occurs in two major steps. The first is "nucleation". This is the appearance of a crystalline phase from a supercooled liquid or a supersaturated solvent. The second step is "crystal growth". This is the increase in the size of particles: it leads to a crystal state. Loose particles form layers at the crystal's surface and lodge themselves into open pores, cracks, etc.
Artificial crystallization is a technique to get solid crystals from a homogeneous solution. For crystallization to occur the solution should be supersaturated. Put simply, the solution should contain more solute molecules than it would under ordinary conditions. This can be achieved by various methods—solvent evaporation, cooling, and chemical reaction.
To make things clear we can use a simple example. We take a bowl of water to which we add sugar crystals. We keep adding sugar to it until we reach a stage when no more crystals can be dissolved. This solution is now a saturated one. It is interesting to note that we can dissolve more crystals to this particular saturated solution by heating it. Solubility of solutes increases with increase in temperature, but there are exceptional cases. This increase in temperature causes more sugar crystals to dissolve (so forming a supersaturated solution), but when the temperature of the solution cools down, the solubility of the solute decreases This is because the temperature of the solution has decreased, and the 'excess' sugar crystallizes out. This process illustrates the simplest of supersaturation techniques.
'Drowning' is the addition of a nonsolvent in the solution that decreases the solubility of the solid. Alternatively, chemical reactions can also be used to decrease the solubility of the solid in the solvent, thus working towards supersaturation.
Crystallization can be divided into stages primary nucleation is the first. It is the growth of a new crystal. In turn this causes secondary nucleation – the final stage if removal of the crystals is not an issue. Secondary nucleation needs existing crystals to continue crystal growth. In our sugar example, we had got such nuclei when the 'excess' sugar had just about crystallized out. Secondary nucleation is the main stage in crystallization for this is what causes the 'mass production' of crystals.
Stir frying