Guess Paper – 2009 Class – X Subject – Chemistry (P- Block Elements) Kalra sir 09460472649 kalra1977@rediffmail.com Group 15 elements: |Symbol |Atomic |Electronic configuration | | |number | | | |7 |[He]2s22p3 | |N | | | |P |15 |[Ne] 3s23p3 | |As |33 |[Ar]3d104s24p3
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Zachary Haw February 25‚ 2012 TOK13B Mr. Marana Y11 TOK FORMAL PAPER It had been a common question and debate on how people think based on the things that they know. Many people believe that things that we know are based on the things that are established on us through our culture‚ environment and society. According to the prompt that "We see and understand things not as they are but as we are"‚ this statement be a common ground of discussion in this paper. While this maybe
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Microscale Crystallization – Craig Tube For this experiment‚ we had to find the percent recovery and melting point of pure sulfanilamide from impure sulfanilamide using the crystallization technique. To start‚ .1004 grams of impure sulfanilamide was put into a Craig tube with enough ethyl alcohol to barely pass the top of the sulfanilamide. The Craig tube was put into a stone block until boil‚ then check to see if the solid material had dissolve. With the addition of two more drops from a supply
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of intermolecular bond. (Happens a lot in alcohol group. More O-H = more hydrogen bonds.) More hydrogen bonds means a higher boiling point as these bonds are quite strong and need to be broken before the molecule can become a gas. Electronegativity is the ability of an element to draw electrons to itself. Purification of an organic liquid product 1. Shake with sodium hydrogencarbonate to remove acidic impurities. 2. Separate from other immiscible liquids using a separating
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ENCl = 3.0; ENPd = 2.2: DEN = 0.8 PdCl2 is polar covalent. (d) BBr3 ENBr = 2.8; ENB = 2.0: DEN = 0.8 BBr3 is polar covalent. (e) NaOH Na+-OH- is ionic (f) CH3Li CH3Li is polar covalent. Use the electronegativity data in Figure 7.4 to predict which bond in each of the following pairs is more polar. (a) C-H or C-Cl Respective DEN’s: 0.4 & 0.5 C-Cl is more polar(b) Si-Li or Si-Cl Respective DEN’s: 0.8 & 1.2 Si-Cl is more polar. (c) N-Cl or
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Metals and Halogens reactions Elements such as fluorine‚ chlorine‚ bromine‚ iodine‚ and astatine belong to Group 7‚ Halogens. At room temperature‚ fluorine is a yellow gas‚ chlorine is a pale green gas‚ bromine is a red liquid‚ and iodine is a purple solid. Astatine is a radioactive element‚ therefore it exists only in small amounts. All the halogens exist in diatomic molecules. They have high ionization energies and are the most electronegative elements. Their electron configuration ns2 np5 make
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* The halogens can be found on the left-hand side of the noble gases. * These five toxic‚ non-metallic elements make up Group 17 of the periodic table and consist of: fluorine (F)‚ chlorine (Cl)‚ bromine (Br)‚ iodine (I)‚ and astatine (At). * Although astatine is radioactive and only has short-lived isotopes‚ it behaves similar to iodine and is often included in the halogen group. * Since the halogen elements have seven valence electrons‚ they only require one additional electron to form
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The seven elements and various claims for its discovery reveal many of the nationalistic traits that we have seen in the case of other elements‚ most notably the controversy surrounding the discovery of hafnium‚ element 72. But element 85 gives our study a greater depth than has yet been revealed by the already covered elements. What this story shows is that the nationalistic prejudices persist to this day in many respects and that the identity of the “discoverer” of the element very much depends
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mix? The answer to this is simple: polarity. What exactly is polarity? A polar bond is when there is a difference in electronegativity‚ which means the tendency of an atom to attract a bonding pair of electrons. When two atoms are bonded together and one attracts more electrons‚ this results in a polar bond. If the atoms have a similar or close to similar amounts of electronegativity‚ the compound is nonpolar. When two compounds that have different polarities are put in a situation together‚ they will
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elements electronegativity and give them a value through calculation‚ where fluorine have the highest electronegativity of 4.0. He used electronegativity to explain the polarity of a chemical bond. He stated that a very polar bond will be an ionic bond with a different electronegativity larger than 1.7; not too polar will be polar covalent bond with a different electronegativity smaller than 1.7 and larger than 0.5; nonpolar bond will be a pure covalent bond with a different electronegativity smaller
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